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如何使用C#在ASP.NET中生成PDF

Curtis Chau
Curtis Chau
更新日期:

Generating PDFs programmatically is a critical requirement for modern web applications, whether you're creating invoices, reports, certificates, or tickets. If you're an ASP.NET Core .NET developer looking to implement robust PDF generation with pixel-perfect rendering and enterprise features, you're in the right place.

This comprehensive guide will walk you through professional PDF file generation using IronPDF, a powerful .NET library that enables the creation of PDF documents with ease. We'll explore everything from basic setup to advanced batch processing, showcasing how efficient and easily integrated it can be. By the end, you’ll have a powerful PDF converter for generating PDF documents in your ASP.NET app using IronPDF like a pro.

Why Generate PDFs in ASP.NET Core?

Server-side PDF generation offers significant advantages over client-side alternatives. When you generate PDFs on the server, you ensure consistent output across all browsers and devices, eliminate dependency on client-side resources, and maintain better control over sensitive data. Common business scenarios for HTML to PDF conversion include:

  • Financial documents: Invoices, statements, and transaction receipts
  • Compliance reports: Regulatory filings and audit documentation
  • User certificates: Training completions and professional certifications
  • Event tickets: QR-coded entry passes and boarding passes
  • Data exports: Analytics reports and dashboard snapshots

Furthermore, the server-side approach ensures that the PDFs are consistent across all browsers and operating systems. Making it highly regarded in terms of legal and financial documents.

How Does IronPDF Transform Your PDF Generation?

IronPDF is a PDF library that stands out in the .NET ecosystem thanks to its HTML converter, which uses a complete Chrome rendering engine under the hood. This means your PDF documents render exactly as they would in Google Chrome, with full support for modern CSS3, JavaScript execution, and web fonts. Unlike other libraries, IronPDF enables you to directly convert your existing HTML, CSS, and JavaScript knowledge into PDF generation capabilities within your ASP.NET Core applications.

Key advantages that transform your development:

  • Chrome-based rendering for pixel-perfect accuracy, matching what you see in the browser when carrying out HTML to PDF conversion tasks (often in just a few lines of code)
  • Full HTML5, CSS3, and JavaScript support, including modern frameworks like Bootstrap
  • Native .NET integration without external dependencies or command-line tools
  • Cross-platform compatibility supporting .NET 6/7/8, .NET Core, and even .NET Framework 4.6.2+ for legacy applications
  • Comprehensive API for post-generation manipulation, including merging, watermarking, and digital signatures of your PDF pages.

NuGet 用 NuGet 安裝

PM >  Install-Package IronPdf

在 NuGet 查看 https://www.nuget.org/packages/IronPdf 以快速安裝。超過 1000 萬次下載，它正在用 C# 改變 PDF 開發。 您還可以下載 DLL 或 Windows 安裝程序。

Setting Up Your ASP.NET Core Project

Let's create a new ASP.NET Core MVC application configured for PDF generation. We'll build a production-ready setup with proper dependency injection and error handling. This will be a new .NET project in Visual Studio; however, you are also welcome to use an existing project.

Creating the Project

We will create this project and give it a fitting project name by running the following command:

dotnet new mvc -n PdfGeneratorApp
cd PdfGeneratorApp

Installing IronPDF

Before we begin generating PDF documents in ASP.NET, add IronPDF to your project by running the following lines in the NuGet Package Manager Console:

Install-Package IronPdf
Install-Package IronPdf.Extensions.Mvc.Core

For detailed installation options, including NuGet packages configuration and Windows installer, refer to the official documentation.

Configuring Services in Program.cs

using IronPdf;
using IronPdf.Extensions.Mvc.Core;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
var builder = WebApplication.CreateBuilder(args);
// Configure IronPDF license (use your license key)
License.LicenseKey = "your-license-key";
// Add MVC services
builder.Services.AddControllersWithViews();
// Register IronPDF services
builder.Services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
builder.Services.AddSingleton<ITempDataProvider, CookieTempDataProvider>();
builder.Services.AddSingleton<IRazorViewRenderer, RazorViewRenderer>();
// Configure ChromePdfRenderer as a service
builder.Services.AddSingleton<ChromePdfRenderer>(provider =>
{
    var renderer = new ChromePdfRenderer();
    // Configure rendering options
    renderer.RenderingOptions.MarginTop = 25;
    renderer.RenderingOptions.MarginBottom = 25;
    renderer.RenderingOptions.MarginLeft = 20;
    renderer.RenderingOptions.MarginRight = 20;
    renderer.RenderingOptions.EnableJavaScript = true;
    renderer.RenderingOptions.RenderDelay = 500; // Wait for JS execution
    return renderer;
});
var app = builder.Build();
// Configure middleware pipeline
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
    app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");
app.Run();
using IronPdf;
using IronPdf.Extensions.Mvc.Core;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
var builder = WebApplication.CreateBuilder(args);
// Configure IronPDF license (use your license key)
License.LicenseKey = "your-license-key";
// Add MVC services
builder.Services.AddControllersWithViews();
// Register IronPDF services
builder.Services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
builder.Services.AddSingleton<ITempDataProvider, CookieTempDataProvider>();
builder.Services.AddSingleton<IRazorViewRenderer, RazorViewRenderer>();
// Configure ChromePdfRenderer as a service
builder.Services.AddSingleton<ChromePdfRenderer>(provider =>
{
    var renderer = new ChromePdfRenderer();
    // Configure rendering options
    renderer.RenderingOptions.MarginTop = 25;
    renderer.RenderingOptions.MarginBottom = 25;
    renderer.RenderingOptions.MarginLeft = 20;
    renderer.RenderingOptions.MarginRight = 20;
    renderer.RenderingOptions.EnableJavaScript = true;
    renderer.RenderingOptions.RenderDelay = 500; // Wait for JS execution
    return renderer;
});
var app = builder.Build();
// Configure middleware pipeline
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
    app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");
app.Run();
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

This configuration establishes IronPDF as a singleton service, ensuring efficient resource usage across your application. You can further modify the `RenderingOptions` to suit your specific requirements. At this point, your folder structure in the Solution Explorer in Visual Studio should look like:

Generating PDFs from Razor Views

The most powerful approach to generating new PDF documents in ASP.NET Core involves leveraging Razor views for PDF conversion. This allows you to utilize familiar MVC patterns, strongly typed models, and Razor syntax to create dynamic PDFs from custom HTML files, web pages, and other sources. According to Microsoft's documentation on Razor Pages, this approach provides the cleanest separation of concerns for page-focused scenarios.

Creating the Data Model

First, let's create a comprehensive model that represents a typical business document:

namespace PdfGeneratorApp.Models
{
    public class InvoiceModel
    {
        public string InvoiceNumber { get; set; }
        public DateTime InvoiceDate { get; set; }
        public DateTime DueDate { get; set; }
        public CompanyInfo Vendor { get; set; }
        public CompanyInfo Customer { get; set; }
        public List<InvoiceItem> Items { get; set; }
        public decimal Subtotal => Items?.Sum(x => x.Total) ?? 0;
        public decimal TaxRate { get; set; }
        public decimal TaxAmount => Subtotal * (TaxRate / 100);
        public decimal Total => Subtotal + TaxAmount;
        public string Notes { get; set; }
        public string PaymentTerms { get; set; }
    }
    public class CompanyInfo
    {
        public string Name { get; set; }
        public string Address { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public string ZipCode { get; set; }
        public string Email { get; set; }
        public string Phone { get; set; }
    }
    public class InvoiceItem
    {
        public string Description { get; set; }
        public int Quantity { get; set; }
        public decimal UnitPrice { get; set; }
        public decimal Total => Quantity * UnitPrice;
    }
}
namespace PdfGeneratorApp.Models
{
    public class InvoiceModel
    {
        public string InvoiceNumber { get; set; }
        public DateTime InvoiceDate { get; set; }
        public DateTime DueDate { get; set; }
        public CompanyInfo Vendor { get; set; }
        public CompanyInfo Customer { get; set; }
        public List<InvoiceItem> Items { get; set; }
        public decimal Subtotal => Items?.Sum(x => x.Total) ?? 0;
        public decimal TaxRate { get; set; }
        public decimal TaxAmount => Subtotal * (TaxRate / 100);
        public decimal Total => Subtotal + TaxAmount;
        public string Notes { get; set; }
        public string PaymentTerms { get; set; }
    }
    public class CompanyInfo
    {
        public string Name { get; set; }
        public string Address { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public string ZipCode { get; set; }
        public string Email { get; set; }
        public string Phone { get; set; }
    }
    public class InvoiceItem
    {
        public string Description { get; set; }
        public int Quantity { get; set; }
        public decimal UnitPrice { get; set; }
        public decimal Total => Quantity * UnitPrice;
    }
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Building the Razor View

Create a view at Views/Invoice/InvoiceTemplate.cshtml that renders your PDF content:

@model PdfGeneratorApp.Models.InvoiceModel
@{
    Layout = null; // PDFs should not use the site layout
}
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>Invoice @Model.InvoiceNumber</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
        }
        .invoice-container {
            max-width: 800px;
            margin: 0 auto;
            padding: 30px;
        }
        .invoice-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 40px;
            padding-bottom: 20px;
            border-bottom: 2px solid #2c3e50;
        }
        .company-details {
            flex: 1;
        }
        .company-details h1 {
            color: #2c3e50;
            margin-bottom: 10px;
        }
        .invoice-details {
            text-align: right;
        }
        .invoice-details h2 {
            color: #2c3e50;
            font-size: 28px;
            margin-bottom: 10px;
        }
        .invoice-details p {
            margin: 5px 0;
            font-size: 14px;
        }
        .billing-details {
            display: flex;
            justify-content: space-between;
            margin-bottom: 40px;
        }
        .billing-section {
            flex: 1;
        }
        .billing-section h3 {
            color: #2c3e50;
            margin-bottom: 10px;
            font-size: 16px;
            text-transform: uppercase;
        }
        .items-table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 40px;
        }
        .items-table thead {
            background-color: #2c3e50;
            color: white;
        }
        .items-table th,
        .items-table td {
            padding: 12px;
            text-align: left;
            border-bottom: 1px solid #ddd;
        }
        .items-table tbody tr:hover {
            background-color: #f5f5f5;
        }
        .text-right {
            text-align: right;
        }
        .invoice-summary {
            display: flex;
            justify-content: flex-end;
            margin-bottom: 40px;
        }
        .summary-table {
            width: 300px;
        }
        .summary-table tr {
            border-bottom: 1px solid #ddd;
        }
        .summary-table td {
            padding: 8px;
        }
        .summary-table .total-row {
            font-weight: bold;
            font-size: 18px;
            color: #2c3e50;
            border-top: 2px solid #2c3e50;
        }
        .invoice-footer {
            margin-top: 60px;
            padding-top: 20px;
            border-top: 1px solid #ddd;
        }
        .footer-notes {
            margin-bottom: 20px;
        }
        .footer-notes h4 {
            color: #2c3e50;
            margin-bottom: 10px;
        }
        @@media print {
            .invoice-container {
                padding: 0;
            }
        }
    </style>
</head>
<body>
    <div class="invoice-container">
        <div class="invoice-header">
            <div class="company-details">
                <h1>@Model.Vendor.Name</h1>
                <p>@Model.Vendor.Address</p>
                <p>@Model.Vendor.City, @Model.Vendor.State @Model.Vendor.ZipCode</p>
                <p>Email: @Model.Vendor.Email</p>
                <p>Phone: @Model.Vendor.Phone</p>
            </div>
            <div class="invoice-details">
                <h2>INVOICE</h2>
                <p><strong>Invoice #:</strong> @Model.InvoiceNumber</p>
                <p><strong>Date:</strong> @Model.InvoiceDate.ToString("MMM dd, yyyy")</p>
                <p><strong>Due Date:</strong> @Model.DueDate.ToString("MMM dd, yyyy")</p>
            </div>
        </div>
        <div class="billing-details">
            <div class="billing-section">
                <h3>Bill To:</h3>
                <p><strong>@Model.Customer.Name</strong></p>
                <p>@Model.Customer.Address</p>
                <p>@Model.Customer.City, @Model.Customer.State @Model.Customer.ZipCode</p>
                <p>@Model.Customer.Email</p>
            </div>
        </div>
        <table class="items-table">
            <thead>
                <tr>
                    <th>Description</th>
                    <th class="text-right">Quantity</th>
                    <th class="text-right">Unit Price</th>
                    <th class="text-right">Total</th>
                </tr>
            </thead>
            <tbody>
                @foreach (var item in Model.Items)
                {
                    <tr>
                        <td>@item.Description</td>
                        <td class="text-right">@item.Quantity</td>
                        <td class="text-right">@item.UnitPrice.ToString("C")</td>
                        <td class="text-right">@item.Total.ToString("C")</td>
                    </tr>
                }
            </tbody>
        </table>
        <div class="invoice-summary">
            <table class="summary-table">
                <tr>
                    <td>Subtotal:</td>
                    <td class="text-right">@Model.Subtotal.ToString("C")</td>
                </tr>
                <tr>
                    <td>Tax (@Model.TaxRate%):</td>
                    <td class="text-right">@Model.TaxAmount.ToString("C")</td>
                </tr>
                <tr class="total-row">
                    <td>Total:</td>
                    <td class="text-right">@Model.Total.ToString("C")</td>
                </tr>
            </table>
        </div>
        @if (!string.IsNullOrEmpty(Model.Notes))
        {
            <div class="invoice-footer">
                <div class="footer-notes">
                    <h4>Notes</h4>
                    <p>@Model.Notes</p>
                </div>
            </div>
        }
        @if (!string.IsNullOrEmpty(Model.PaymentTerms))
        {
            <div class="footer-notes">
                <h4>Payment Terms</h4>
                <p>@Model.PaymentTerms</p>
            </div>
        }
    </div>
</body>
</html>
@model PdfGeneratorApp.Models.InvoiceModel
@{
    Layout = null; // PDFs should not use the site layout
}
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>Invoice @Model.InvoiceNumber</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
        }
        .invoice-container {
            max-width: 800px;
            margin: 0 auto;
            padding: 30px;
        }
        .invoice-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 40px;
            padding-bottom: 20px;
            border-bottom: 2px solid #2c3e50;
        }
        .company-details {
            flex: 1;
        }
        .company-details h1 {
            color: #2c3e50;
            margin-bottom: 10px;
        }
        .invoice-details {
            text-align: right;
        }
        .invoice-details h2 {
            color: #2c3e50;
            font-size: 28px;
            margin-bottom: 10px;
        }
        .invoice-details p {
            margin: 5px 0;
            font-size: 14px;
        }
        .billing-details {
            display: flex;
            justify-content: space-between;
            margin-bottom: 40px;
        }
        .billing-section {
            flex: 1;
        }
        .billing-section h3 {
            color: #2c3e50;
            margin-bottom: 10px;
            font-size: 16px;
            text-transform: uppercase;
        }
        .items-table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 40px;
        }
        .items-table thead {
            background-color: #2c3e50;
            color: white;
        }
        .items-table th,
        .items-table td {
            padding: 12px;
            text-align: left;
            border-bottom: 1px solid #ddd;
        }
        .items-table tbody tr:hover {
            background-color: #f5f5f5;
        }
        .text-right {
            text-align: right;
        }
        .invoice-summary {
            display: flex;
            justify-content: flex-end;
            margin-bottom: 40px;
        }
        .summary-table {
            width: 300px;
        }
        .summary-table tr {
            border-bottom: 1px solid #ddd;
        }
        .summary-table td {
            padding: 8px;
        }
        .summary-table .total-row {
            font-weight: bold;
            font-size: 18px;
            color: #2c3e50;
            border-top: 2px solid #2c3e50;
        }
        .invoice-footer {
            margin-top: 60px;
            padding-top: 20px;
            border-top: 1px solid #ddd;
        }
        .footer-notes {
            margin-bottom: 20px;
        }
        .footer-notes h4 {
            color: #2c3e50;
            margin-bottom: 10px;
        }
        @@media print {
            .invoice-container {
                padding: 0;
            }
        }
    </style>
</head>
<body>
    <div class="invoice-container">
        <div class="invoice-header">
            <div class="company-details">
                <h1>@Model.Vendor.Name</h1>
                <p>@Model.Vendor.Address</p>
                <p>@Model.Vendor.City, @Model.Vendor.State @Model.Vendor.ZipCode</p>
                <p>Email: @Model.Vendor.Email</p>
                <p>Phone: @Model.Vendor.Phone</p>
            </div>
            <div class="invoice-details">
                <h2>INVOICE</h2>
                <p><strong>Invoice #:</strong> @Model.InvoiceNumber</p>
                <p><strong>Date:</strong> @Model.InvoiceDate.ToString("MMM dd, yyyy")</p>
                <p><strong>Due Date:</strong> @Model.DueDate.ToString("MMM dd, yyyy")</p>
            </div>
        </div>
        <div class="billing-details">
            <div class="billing-section">
                <h3>Bill To:</h3>
                <p><strong>@Model.Customer.Name</strong></p>
                <p>@Model.Customer.Address</p>
                <p>@Model.Customer.City, @Model.Customer.State @Model.Customer.ZipCode</p>
                <p>@Model.Customer.Email</p>
            </div>
        </div>
        <table class="items-table">
            <thead>
                <tr>
                    <th>Description</th>
                    <th class="text-right">Quantity</th>
                    <th class="text-right">Unit Price</th>
                    <th class="text-right">Total</th>
                </tr>
            </thead>
            <tbody>
                @foreach (var item in Model.Items)
                {
                    <tr>
                        <td>@item.Description</td>
                        <td class="text-right">@item.Quantity</td>
                        <td class="text-right">@item.UnitPrice.ToString("C")</td>
                        <td class="text-right">@item.Total.ToString("C")</td>
                    </tr>
                }
            </tbody>
        </table>
        <div class="invoice-summary">
            <table class="summary-table">
                <tr>
                    <td>Subtotal:</td>
                    <td class="text-right">@Model.Subtotal.ToString("C")</td>
                </tr>
                <tr>
                    <td>Tax (@Model.TaxRate%):</td>
                    <td class="text-right">@Model.TaxAmount.ToString("C")</td>
                </tr>
                <tr class="total-row">
                    <td>Total:</td>
                    <td class="text-right">@Model.Total.ToString("C")</td>
                </tr>
            </table>
        </div>
        @if (!string.IsNullOrEmpty(Model.Notes))
        {
            <div class="invoice-footer">
                <div class="footer-notes">
                    <h4>Notes</h4>
                    <p>@Model.Notes</p>
                </div>
            </div>
        }
        @if (!string.IsNullOrEmpty(Model.PaymentTerms))
        {
            <div class="footer-notes">
                <h4>Payment Terms</h4>
                <p>@Model.PaymentTerms</p>
            </div>
        }
    </div>
</body>
</html>
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Implementing the Controller with Error Handling

Now let's create a robust controller that generates PDFs with comprehensive error handling:

using IronPdf;
using IronPdf.Extensions.Mvc.Core;
using Microsoft.AspNetCore.Mvc;
using PdfGeneratorApp.Models;
using System.Diagnostics;
namespace PdfGeneratorApp.Controllers
{
    public class InvoiceController : Controller
    {
        private readonly ILogger<InvoiceController> _logger;
        private readonly IRazorViewRenderer _viewRenderer;
        private readonly ChromePdfRenderer _pdfRenderer;
        private readonly IWebHostEnvironment _environment;
        public InvoiceController(
            ILogger<InvoiceController> logger,
            IRazorViewRenderer viewRenderer,
            ChromePdfRenderer pdfRenderer,
            IWebHostEnvironment environment)
        {
            _logger = logger;
            _viewRenderer = viewRenderer;
            _pdfRenderer = pdfRenderer;
            _environment = environment;
        }
        [HttpGet]
        public IActionResult Index()
        {
            // Display a form or list of invoices
            return View();
        }
        [HttpGet]
        public async Task<IActionResult> GenerateInvoice(string invoiceNumber)
        {
            var stopwatch = Stopwatch.StartNew();
            try
            {
                // Validate input
                if (string.IsNullOrEmpty(invoiceNumber))
                {
                    _logger.LogWarning("Invoice generation attempted without invoice number");
                    return BadRequest("Invoice number is required");
                }
                // Generate sample data (in production, fetch from database)
                var invoice = CreateSampleInvoice(invoiceNumber);
                // Log the generation attempt
                _logger.LogInformation($"Generating PDF for invoice {invoiceNumber}");
                // Configure PDF rendering options
                _pdfRenderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Portrait;
                _pdfRenderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
                _pdfRenderer.RenderingOptions.PrintHtmlBackgrounds = true;
                _pdfRenderer.RenderingOptions.CreatePdfFormsFromHtml = false;
                // Add custom header with page numbers
                _pdfRenderer.RenderingOptions.TextHeader = new TextHeaderFooter
                {
                    CenterText = $"Invoice {invoice.InvoiceNumber}",
                    DrawDividerLine = true,
                    Font = IronSoftware.Drawing.FontTypes.Helvetica,
                    FontSize = 10
                };
                // Add footer with page numbers
                _pdfRenderer.RenderingOptions.TextFooter = new TextHeaderFooter
                {
                    LeftText = "{date} {time}",
                    RightText = "Page {page} of {total-pages}",
                    DrawDividerLine = true,
                    Font = IronSoftware.Drawing.FontTypes.Helvetica,
                    FontSize = 8
                };
                // Render the view to PDF
                PdfDocument pdf;
                try
                {
                    pdf = _pdfRenderer.RenderRazorViewToPdf(
                        _viewRenderer,
                        "Views/Invoice/InvoiceTemplate.cshtml",
                        invoice);
                }
                catch (Exception renderEx)
                {
                    _logger.LogError(renderEx, "Failed to render Razor view to PDF");
                    throw new InvalidOperationException("PDF rendering failed. Please check the template.", renderEx);
                }
                // Apply metadata
                pdf.MetaData.Author = "PdfGeneratorApp";
                pdf.MetaData.Title = $"Invoice {invoice.InvoiceNumber}";
                pdf.MetaData.Subject = $"Invoice for {invoice.Customer.Name}";
                pdf.MetaData.Keywords = "invoice, billing, payment";
                pdf.MetaData.CreationDate = DateTime.UtcNow;
                pdf.MetaData.ModifiedDate = DateTime.UtcNow;
                // Optional: Add password protection
                // pdf.SecuritySettings.UserPassword = "user123";
                // pdf.SecuritySettings.OwnerPassword = "owner456";
                // pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
                // Log performance metrics
                stopwatch.Stop();
                _logger.LogInformation($"PDF generated successfully for invoice {invoiceNumber} in {stopwatch.ElapsedMilliseconds}ms");
                // Return the PDF file
                Response.Headers.Add("Content-Disposition", $"inline; filename=Invoice_{invoiceNumber}.pdf");
                return File(pdf.BinaryData, "application/pdf", $"Invoice_{invoiceNumber}.pdf");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"Error generating PDF for invoice {invoiceNumber}");
                // In development, return detailed error
                if (_environment.IsDevelopment())
                {
                    return StatusCode(500, new
                    {
                        error = "PDF generation failed",
                        message = ex.Message,
                        stackTrace = ex.StackTrace
                    });
                }
                // In production, return generic error
                return StatusCode(500, "An error occurred while generating the PDF");
            }
        }
        private InvoiceModel CreateSampleInvoice(string invoiceNumber)
        {
            return new InvoiceModel
            {
                InvoiceNumber = invoiceNumber,
                InvoiceDate = DateTime.Now,
                DueDate = DateTime.Now.AddDays(30),
                Vendor = new CompanyInfo
                {
                    Name = "Tech Solutions Inc.",
                    Address = "123 Business Ave",
                    City = "New York",
                    State = "NY",
                    ZipCode = "10001",
                    Email = "billing@techsolutions.com",
                    Phone = "(555) 123-4567"
                },
                Customer = new CompanyInfo
                {
                    Name = "Acme Corporation",
                    Address = "456 Commerce St",
                    City = "Los Angeles",
                    State = "CA",
                    ZipCode = "90001",
                    Email = "accounts@acmecorp.com",
                    Phone = "(555) 987-6543"
                },
                Items = new List<InvoiceItem>
                {
                    new InvoiceItem
                    {
                        Description = "Software Development Services - 40 hours",
                        Quantity = 40,
                        UnitPrice = 150.00m
                    },
                    new InvoiceItem
                    {
                        Description = "Project Management - 10 hours",
                        Quantity = 10,
                        UnitPrice = 120.00m
                    },
                    new InvoiceItem
                    {
                        Description = "Quality Assurance Testing",
                        Quantity = 1,
                        UnitPrice = 2500.00m
                    }
                },
                TaxRate = 8.875m,
                Notes = "Payment is due within 30 days. Late payments subject to 1.5% monthly interest.",
                PaymentTerms = "Net 30"
            };
        }
    }
}
using IronPdf;
using IronPdf.Extensions.Mvc.Core;
using Microsoft.AspNetCore.Mvc;
using PdfGeneratorApp.Models;
using System.Diagnostics;
namespace PdfGeneratorApp.Controllers
{
    public class InvoiceController : Controller
    {
        private readonly ILogger<InvoiceController> _logger;
        private readonly IRazorViewRenderer _viewRenderer;
        private readonly ChromePdfRenderer _pdfRenderer;
        private readonly IWebHostEnvironment _environment;
        public InvoiceController(
            ILogger<InvoiceController> logger,
            IRazorViewRenderer viewRenderer,
            ChromePdfRenderer pdfRenderer,
            IWebHostEnvironment environment)
        {
            _logger = logger;
            _viewRenderer = viewRenderer;
            _pdfRenderer = pdfRenderer;
            _environment = environment;
        }
        [HttpGet]
        public IActionResult Index()
        {
            // Display a form or list of invoices
            return View();
        }
        [HttpGet]
        public async Task<IActionResult> GenerateInvoice(string invoiceNumber)
        {
            var stopwatch = Stopwatch.StartNew();
            try
            {
                // Validate input
                if (string.IsNullOrEmpty(invoiceNumber))
                {
                    _logger.LogWarning("Invoice generation attempted without invoice number");
                    return BadRequest("Invoice number is required");
                }
                // Generate sample data (in production, fetch from database)
                var invoice = CreateSampleInvoice(invoiceNumber);
                // Log the generation attempt
                _logger.LogInformation($"Generating PDF for invoice {invoiceNumber}");
                // Configure PDF rendering options
                _pdfRenderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Portrait;
                _pdfRenderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
                _pdfRenderer.RenderingOptions.PrintHtmlBackgrounds = true;
                _pdfRenderer.RenderingOptions.CreatePdfFormsFromHtml = false;
                // Add custom header with page numbers
                _pdfRenderer.RenderingOptions.TextHeader = new TextHeaderFooter
                {
                    CenterText = $"Invoice {invoice.InvoiceNumber}",
                    DrawDividerLine = true,
                    Font = IronSoftware.Drawing.FontTypes.Helvetica,
                    FontSize = 10
                };
                // Add footer with page numbers
                _pdfRenderer.RenderingOptions.TextFooter = new TextHeaderFooter
                {
                    LeftText = "{date} {time}",
                    RightText = "Page {page} of {total-pages}",
                    DrawDividerLine = true,
                    Font = IronSoftware.Drawing.FontTypes.Helvetica,
                    FontSize = 8
                };
                // Render the view to PDF
                PdfDocument pdf;
                try
                {
                    pdf = _pdfRenderer.RenderRazorViewToPdf(
                        _viewRenderer,
                        "Views/Invoice/InvoiceTemplate.cshtml",
                        invoice);
                }
                catch (Exception renderEx)
                {
                    _logger.LogError(renderEx, "Failed to render Razor view to PDF");
                    throw new InvalidOperationException("PDF rendering failed. Please check the template.", renderEx);
                }
                // Apply metadata
                pdf.MetaData.Author = "PdfGeneratorApp";
                pdf.MetaData.Title = $"Invoice {invoice.InvoiceNumber}";
                pdf.MetaData.Subject = $"Invoice for {invoice.Customer.Name}";
                pdf.MetaData.Keywords = "invoice, billing, payment";
                pdf.MetaData.CreationDate = DateTime.UtcNow;
                pdf.MetaData.ModifiedDate = DateTime.UtcNow;
                // Optional: Add password protection
                // pdf.SecuritySettings.UserPassword = "user123";
                // pdf.SecuritySettings.OwnerPassword = "owner456";
                // pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
                // Log performance metrics
                stopwatch.Stop();
                _logger.LogInformation($"PDF generated successfully for invoice {invoiceNumber} in {stopwatch.ElapsedMilliseconds}ms");
                // Return the PDF file
                Response.Headers.Add("Content-Disposition", $"inline; filename=Invoice_{invoiceNumber}.pdf");
                return File(pdf.BinaryData, "application/pdf", $"Invoice_{invoiceNumber}.pdf");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"Error generating PDF for invoice {invoiceNumber}");
                // In development, return detailed error
                if (_environment.IsDevelopment())
                {
                    return StatusCode(500, new
                    {
                        error = "PDF generation failed",
                        message = ex.Message,
                        stackTrace = ex.StackTrace
                    });
                }
                // In production, return generic error
                return StatusCode(500, "An error occurred while generating the PDF");
            }
        }
        private InvoiceModel CreateSampleInvoice(string invoiceNumber)
        {
            return new InvoiceModel
            {
                InvoiceNumber = invoiceNumber,
                InvoiceDate = DateTime.Now,
                DueDate = DateTime.Now.AddDays(30),
                Vendor = new CompanyInfo
                {
                    Name = "Tech Solutions Inc.",
                    Address = "123 Business Ave",
                    City = "New York",
                    State = "NY",
                    ZipCode = "10001",
                    Email = "billing@techsolutions.com",
                    Phone = "(555) 123-4567"
                },
                Customer = new CompanyInfo
                {
                    Name = "Acme Corporation",
                    Address = "456 Commerce St",
                    City = "Los Angeles",
                    State = "CA",
                    ZipCode = "90001",
                    Email = "accounts@acmecorp.com",
                    Phone = "(555) 987-6543"
                },
                Items = new List<InvoiceItem>
                {
                    new InvoiceItem
                    {
                        Description = "Software Development Services - 40 hours",
                        Quantity = 40,
                        UnitPrice = 150.00m
                    },
                    new InvoiceItem
                    {
                        Description = "Project Management - 10 hours",
                        Quantity = 10,
                        UnitPrice = 120.00m
                    },
                    new InvoiceItem
                    {
                        Description = "Quality Assurance Testing",
                        Quantity = 1,
                        UnitPrice = 2500.00m
                    }
                },
                TaxRate = 8.875m,
                Notes = "Payment is due within 30 days. Late payments subject to 1.5% monthly interest.",
                PaymentTerms = "Net 30"
            };
        }
    }
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Code Explanation

To test and run the PDF generator above, launch the project and enter the following URL: "https://localhost:[port]/Invoice/GenerateInvoice?invoiceNumber=055" to generate the invoice. Please remember to replace the port with the actual port number on which you hosted the application.

Output

How to Generate a PDF in ASP.NET Using C#: Figure 4 - PDF Output

How to Return PDFs from Web API Endpoints for Maximum Efficiency?

For applications that require serving PDFs through RESTful APIs, here's how to implement efficient PDF delivery with proper memory management. This approach is particularly useful when building microservices or when you need to generate PDFs in ASP.NET Core Web API controllers:

using Microsoft.AspNetCore.Mvc;
using IronPdf;
using System.IO;
namespace PdfGeneratorApp.Controllers.Api
{
    [ApiController]
    [Route("api/[controller]")]
    public class PdfApiController : ControllerBase
    {
        private readonly ChromePdfRenderer _pdfRenderer;
        private readonly ILogger<PdfApiController> _logger;
        public PdfApiController(
            ChromePdfRenderer pdfRenderer,
            ILogger<PdfApiController> logger)
        {
            _pdfRenderer = pdfRenderer;
            _logger = logger;
        }
        [HttpPost("generate-report")]
        public async Task<IActionResult> GenerateReport([FromBody] ReportRequest request)
        {
            try
            {
                // Validate request
                if (!ModelState.IsValid)
                {
                    return BadRequest(ModelState);
                }
                // Build HTML content dynamically
                var htmlContent = BuildReportHtml(request);
                // Generate PDF with memory-efficient streaming
                using var pdfDocument = _pdfRenderer.RenderHtmlAsPdf(htmlContent);
                // Apply compression for smaller file size
                pdfDocument.CompressImages(60); // 60% quality
                // Stream the PDF directly to response
                var stream = new MemoryStream();
                pdfDocument.SaveAs(stream);
                stream.Position = 0;
                _logger.LogInformation($"Report generated for {request.ReportType}");
                return new FileStreamResult(stream, "application/pdf")
                {
                    FileDownloadName = $"Report_{DateTime.Now:yyyyMMdd_HHmmss}.pdf"
                };
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Failed to generate report");
                return StatusCode(500, new { error = "Report generation failed" });
            }
        }
        [HttpGet("download/{documentId}")]
        public async Task<IActionResult> DownloadDocument(string documentId)
        {
            try
            {
                // In production, retrieve document from database or storage
                var documentPath = Path.Combine("wwwroot", "documents", $"{documentId}.pdf");
                if (!System.IO.File.Exists(documentPath))
                {
                    return NotFound(new { error = "Document not found" });
                }
                var memory = new MemoryStream();
                using (var stream = new FileStream(documentPath, FileMode.Open))
                {
                    await stream.CopyToAsync(memory);
                }
                memory.Position = 0;
                return File(memory, "application/pdf", $"Document_{documentId}.pdf");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"Failed to download document {documentId}");
                return StatusCode(500, new { error = "Download failed" });
            }
        }
        private string BuildReportHtml(ReportRequest request)
        {
            return $@"
                <!DOCTYPE html>
                <html>
                <head>
                    <style>
                        body {{ 
                            font-family: Arial, sans-serif; 
                            margin: 40px;
                        }}
                        h1 {{ 
                            color: #2c3e50; 
                            border-bottom: 2px solid #3498db;
                            padding-bottom: 10px;
                        }}
                        .report-date {{ 
                            color: #7f8c8d; 
                            font-size: 14px;
                        }}
                        .data-table {{
                            width: 100%;
                            border-collapse: collapse;
                            margin-top: 20px;
                        }}
                        .data-table th, .data-table td {{
                            border: 1px solid #ddd;
                            padding: 12px;
                            text-align: left;
                        }}
                        .data-table th {{
                            background-color: #3498db;
                            color: white;
                        }}
                    </style>
                </head>
                <body>
                    <h1>{request.ReportType} Report</h1>
                    <p class='report-date'>Generated: {DateTime.Now:MMMM dd, yyyy HH:mm}</p>
                    <p>{request.Description}</p>
                    {GenerateDataTable(request.Data)}
                </body>
                </html>";
        }
        private string GenerateDataTable(List<ReportDataItem> data)
        {
            if (data == null || !data.Any())
                return "<p>No data available</p>";
            var table = "<table class='data-table'><thead><tr>";
            // Add headers
            foreach (var prop in typeof(ReportDataItem).GetProperties())
            {
                table += $"<th>{prop.Name}</th>";
            }
            table += "</tr></thead><tbody>";
            // Add data rows
            foreach (var item in data)
            {
                table += "<tr>";
                foreach (var prop in typeof(ReportDataItem).GetProperties())
                {
                    var value = prop.GetValue(item) ?? "";
                    table += $"<td>{value}</td>";
                }
                table += "</tr>";
            }
            table += "</tbody></table>";
            return table;
        }
    }
    public class ReportRequest
    {
        public string ReportType { get; set; }
        public string Description { get; set; }
        public List<ReportDataItem> Data { get; set; }
    }
    public class ReportDataItem
    {
        public string Name { get; set; }
        public string Category { get; set; }
        public decimal Value { get; set; }
        public DateTime Date { get; set; }
    }
}
using Microsoft.AspNetCore.Mvc;
using IronPdf;
using System.IO;
namespace PdfGeneratorApp.Controllers.Api
{
    [ApiController]
    [Route("api/[controller]")]
    public class PdfApiController : ControllerBase
    {
        private readonly ChromePdfRenderer _pdfRenderer;
        private readonly ILogger<PdfApiController> _logger;
        public PdfApiController(
            ChromePdfRenderer pdfRenderer,
            ILogger<PdfApiController> logger)
        {
            _pdfRenderer = pdfRenderer;
            _logger = logger;
        }
        [HttpPost("generate-report")]
        public async Task<IActionResult> GenerateReport([FromBody] ReportRequest request)
        {
            try
            {
                // Validate request
                if (!ModelState.IsValid)
                {
                    return BadRequest(ModelState);
                }
                // Build HTML content dynamically
                var htmlContent = BuildReportHtml(request);
                // Generate PDF with memory-efficient streaming
                using var pdfDocument = _pdfRenderer.RenderHtmlAsPdf(htmlContent);
                // Apply compression for smaller file size
                pdfDocument.CompressImages(60); // 60% quality
                // Stream the PDF directly to response
                var stream = new MemoryStream();
                pdfDocument.SaveAs(stream);
                stream.Position = 0;
                _logger.LogInformation($"Report generated for {request.ReportType}");
                return new FileStreamResult(stream, "application/pdf")
                {
                    FileDownloadName = $"Report_{DateTime.Now:yyyyMMdd_HHmmss}.pdf"
                };
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Failed to generate report");
                return StatusCode(500, new { error = "Report generation failed" });
            }
        }
        [HttpGet("download/{documentId}")]
        public async Task<IActionResult> DownloadDocument(string documentId)
        {
            try
            {
                // In production, retrieve document from database or storage
                var documentPath = Path.Combine("wwwroot", "documents", $"{documentId}.pdf");
                if (!System.IO.File.Exists(documentPath))
                {
                    return NotFound(new { error = "Document not found" });
                }
                var memory = new MemoryStream();
                using (var stream = new FileStream(documentPath, FileMode.Open))
                {
                    await stream.CopyToAsync(memory);
                }
                memory.Position = 0;
                return File(memory, "application/pdf", $"Document_{documentId}.pdf");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"Failed to download document {documentId}");
                return StatusCode(500, new { error = "Download failed" });
            }
        }
        private string BuildReportHtml(ReportRequest request)
        {
            return $@"
                <!DOCTYPE html>
                <html>
                <head>
                    <style>
                        body {{ 
                            font-family: Arial, sans-serif; 
                            margin: 40px;
                        }}
                        h1 {{ 
                            color: #2c3e50; 
                            border-bottom: 2px solid #3498db;
                            padding-bottom: 10px;
                        }}
                        .report-date {{ 
                            color: #7f8c8d; 
                            font-size: 14px;
                        }}
                        .data-table {{
                            width: 100%;
                            border-collapse: collapse;
                            margin-top: 20px;
                        }}
                        .data-table th, .data-table td {{
                            border: 1px solid #ddd;
                            padding: 12px;
                            text-align: left;
                        }}
                        .data-table th {{
                            background-color: #3498db;
                            color: white;
                        }}
                    </style>
                </head>
                <body>
                    <h1>{request.ReportType} Report</h1>
                    <p class='report-date'>Generated: {DateTime.Now:MMMM dd, yyyy HH:mm}</p>
                    <p>{request.Description}</p>
                    {GenerateDataTable(request.Data)}
                </body>
                </html>";
        }
        private string GenerateDataTable(List<ReportDataItem> data)
        {
            if (data == null || !data.Any())
                return "<p>No data available</p>";
            var table = "<table class='data-table'><thead><tr>";
            // Add headers
            foreach (var prop in typeof(ReportDataItem).GetProperties())
            {
                table += $"<th>{prop.Name}</th>";
            }
            table += "</tr></thead><tbody>";
            // Add data rows
            foreach (var item in data)
            {
                table += "<tr>";
                foreach (var prop in typeof(ReportDataItem).GetProperties())
                {
                    var value = prop.GetValue(item) ?? "";
                    table += $"<td>{value}</td>";
                }
                table += "</tr>";
            }
            table += "</tbody></table>";
            return table;
        }
    }
    public class ReportRequest
    {
        public string ReportType { get; set; }
        public string Description { get; set; }
        public List<ReportDataItem> Data { get; set; }
    }
    public class ReportDataItem
    {
        public string Name { get; set; }
        public string Category { get; set; }
        public decimal Value { get; set; }
        public DateTime Date { get; set; }
    }
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Adding Professional Headers, Footers, and Styling

Professional PDFs require consistent headers, footers, and styling. IronPDF provides both simple text-based and advanced HTML-based options. By using CSS styles to style the HTML markup, we can create custom PDF headers and footers. The following code snippet explores how we could use this in our current project:

using IronPdf;
using IronPdf.Extensions.Mvc.Core;
using Microsoft.AspNetCore.Mvc;
using PdfGeneratorApp.Models;
using PdfGeneratorApp.Services;
using System.Diagnostics;
namespace PdfGeneratorApp.Controllers
{
    public class InvoiceController : Controller
    {
        private readonly ILogger<InvoiceController> _logger;
        private readonly IRazorViewRenderer _viewRenderer;
        private readonly ChromePdfRenderer _pdfRenderer;
        private readonly PdfFormattingService _pdfFormattingService;
        private readonly IWebHostEnvironment _environment;
        public InvoiceController(
            ILogger<InvoiceController> logger,
            IRazorViewRenderer viewRenderer,
            ChromePdfRenderer pdfRenderer,
            PdfFormattingService pdfFormattingService,
            IWebHostEnvironment environment)
        {
            _logger = logger;
            _viewRenderer = viewRenderer;
            _pdfRenderer = pdfRenderer;
            _pdfFormattingService = pdfFormattingService;
            _environment = environment;
        }
        [HttpGet]
        public IActionResult Index()
        {
            // Display a form or list of invoices
            return View();
        }
        private void ConfigurePdfRendererOptions(ChromePdfRenderer renderer, InvoiceModel invoice, PdfStylingOptions options)
        {
            // Margins
            renderer.RenderingOptions.MarginTop = options.MarginTop;
            renderer.RenderingOptions.MarginBottom = options.MarginBottom;
            renderer.RenderingOptions.MarginLeft = options.MarginLeft;
            renderer.RenderingOptions.MarginRight = options.MarginRight;
            // Header
            if (options.UseHtmlHeader)
            {
                renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter
                {
                    MaxHeight = 50,
                    HtmlFragment = $@"
                <div style='width: 100%; font-size: 12px; font-family: Arial;'>
                    <div style='float: left; width: 50%;'>
                        <!-- Add your logo or dynamic content here -->
                        <img src='https://ironpdf.com/img/products/ironpdf-logo-text-dotnet.svg' height='40' />
                    </div>
                    <div style='float: right; width: 50%; text-align: right;'>
                        <strong>Invoice {invoice.InvoiceNumber}</strong><br/>
                        Generated: {DateTime.Now:yyyy-MM-dd}
                    </div>
                </div>",
                    LoadStylesAndCSSFromMainHtmlDocument = true
                };
            }
            else
            {
                renderer.RenderingOptions.TextHeader = new TextHeaderFooter
                {
                    CenterText = options.HeaderText,
                    Font = IronSoftware.Drawing.FontTypes.Arial,
                    FontSize = 12,
                    DrawDividerLine = true
                };
            }
            // Footer
            renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
            {
                MaxHeight = 30,
                HtmlFragment = @"
            <div style='width: 100%; font-size: 10px; color: #666;'>
                <div style='float: left; width: 33%;'>
                    © 2025 Your Company
                </div>
                <div style='float: center; width: 33%; text-align: center;'>
                    yourwebsite.com
                </div>
                <div style='float: right; width: 33%; text-align: right;'>
                    Page {page} of {total-pages}
                </div>
            </div>"
            };
            // Optional: Add watermark here (IronPDF supports adding after PDF is generated, so keep it as-is)
            // Margins, paper size etc., can also be set here if needed
            renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Portrait;
            renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
            renderer.RenderingOptions.PrintHtmlBackgrounds = true;
        }
        [HttpGet]
        public async Task<IActionResult> GenerateInvoice(string invoiceNumber)
        {
            var stopwatch = Stopwatch.StartNew();
            try
            {
                // Validate input
                if (string.IsNullOrEmpty(invoiceNumber))
                {
                    _logger.LogWarning("Invoice generation attempted without invoice number");
                    return BadRequest("Invoice number is required");
                }
                // Generate sample data (in production, fetch from database)
                var invoice = CreateSampleInvoice(invoiceNumber);
                // Log the generation attempt
                _logger.LogInformation($"Generating PDF for invoice {invoiceNumber}");
                // Configure PDF rendering options
                _pdfRenderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Portrait;
                _pdfRenderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
                _pdfRenderer.RenderingOptions.PrintHtmlBackgrounds = true;
                _pdfRenderer.RenderingOptions.CreatePdfFormsFromHtml = false;
                var options = new PdfStylingOptions
                {
                    MarginTop = 25,
                    MarginBottom = 25,
                    MarginLeft = 20,
                    MarginRight = 20,
                    UseHtmlHeader = true,
                    HeaderText = $"Invoice {invoice.InvoiceNumber}",
                    AddWatermark = false,
                    ForcePageBreaks = false
                };
                // Apply the styling to the renderer BEFORE rendering PDF
                ConfigurePdfRendererOptions(_pdfRenderer, invoice, options);
                // Render the view to PDF
                PdfDocument pdf;
                try
                {
                    pdf = _pdfRenderer.RenderRazorViewToPdf(
                        _viewRenderer,
                        "Views/Invoice/InvoiceTemplate.cshtml",
                        invoice);
                }
                catch (Exception renderEx)
                {
                    _logger.LogError(renderEx, "Failed to render Razor view to PDF");
                    throw new InvalidOperationException("PDF rendering failed. Please check the template.", renderEx);
                }
                // Apply metadata
                pdf.MetaData.Author = "PdfGeneratorApp";
                pdf.MetaData.Title = $"Invoice {invoice.InvoiceNumber}";
                pdf.MetaData.Subject = $"Invoice for {invoice.Customer.Name}";
                pdf.MetaData.Keywords = "invoice, billing, payment";
                pdf.MetaData.CreationDate = DateTime.UtcNow;
                pdf.MetaData.ModifiedDate = DateTime.UtcNow;
                // Optional: Add password protection
                // pdf.SecuritySettings.UserPassword = "user123";
                // pdf.SecuritySettings.OwnerPassword = "owner456";
                // pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
                // Log performance metrics
                stopwatch.Stop();
                _logger.LogInformation($"PDF generated successfully for invoice {invoiceNumber} in {stopwatch.ElapsedMilliseconds}ms");
                // Return the PDF file
                Response.Headers.Add("Content-Disposition", $"inline; filename=Invoice_{invoiceNumber}.pdf");
                return File(pdf.BinaryData, "application/pdf", $"Invoice_{invoiceNumber}.pdf");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"Error generating PDF for invoice {invoiceNumber}");
                // In development, return detailed error
                if (_environment.IsDevelopment())
                {
                    return StatusCode(500, new
                    {
                        error = "PDF generation failed",
                        message = ex.Message,
                        stackTrace = ex.StackTrace
                    });
                }
                // In production, return generic error
                return StatusCode(500, "An error occurred while generating the PDF");
            }
        }
        private InvoiceModel CreateSampleInvoice(string invoiceNumber)
        {
            return new InvoiceModel
            {
                InvoiceNumber = invoiceNumber,
                InvoiceDate = DateTime.Now,
                DueDate = DateTime.Now.AddDays(30),
                Vendor = new CompanyInfo
                {
                    Name = "Tech Solutions Inc.",
                    Address = "123 Business Ave",
                    City = "New York",
                    State = "NY",
                    ZipCode = "10001",
                    Email = "billing@techsolutions.com",
                    Phone = "(555) 123-4567"
                },
                Customer = new CompanyInfo
                {
                    Name = "Acme Corporation",
                    Address = "456 Commerce St",
                    City = "Los Angeles",
                    State = "CA",
                    ZipCode = "90001",
                    Email = "accounts@acmecorp.com",
                    Phone = "(555) 987-6543"
                },
                Items = new List<InvoiceItem>
                {
                    new InvoiceItem
                    {
                        Description = "Software Development Services - 40 hours",
                        Quantity = 40,
                        UnitPrice = 150.00m
                    },
                    new InvoiceItem
                    {
                        Description = "Project Management - 10 hours",
                        Quantity = 10,
                        UnitPrice = 120.00m
                    },
                    new InvoiceItem
                    {
                        Description = "Quality Assurance Testing",
                        Quantity = 1,
                        UnitPrice = 2500.00m
                    }
                },
                TaxRate = 8.875m,
                Notes = "Payment is due within 30 days. Late payments subject to 1.5% monthly interest.",
                PaymentTerms = "Net 30"
            };
        }
    }
}
using IronPdf;
using IronPdf.Extensions.Mvc.Core;
using Microsoft.AspNetCore.Mvc;
using PdfGeneratorApp.Models;
using PdfGeneratorApp.Services;
using System.Diagnostics;
namespace PdfGeneratorApp.Controllers
{
    public class InvoiceController : Controller
    {
        private readonly ILogger<InvoiceController> _logger;
        private readonly IRazorViewRenderer _viewRenderer;
        private readonly ChromePdfRenderer _pdfRenderer;
        private readonly PdfFormattingService _pdfFormattingService;
        private readonly IWebHostEnvironment _environment;
        public InvoiceController(
            ILogger<InvoiceController> logger,
            IRazorViewRenderer viewRenderer,
            ChromePdfRenderer pdfRenderer,
            PdfFormattingService pdfFormattingService,
            IWebHostEnvironment environment)
        {
            _logger = logger;
            _viewRenderer = viewRenderer;
            _pdfRenderer = pdfRenderer;
            _pdfFormattingService = pdfFormattingService;
            _environment = environment;
        }
        [HttpGet]
        public IActionResult Index()
        {
            // Display a form or list of invoices
            return View();
        }
        private void ConfigurePdfRendererOptions(ChromePdfRenderer renderer, InvoiceModel invoice, PdfStylingOptions options)
        {
            // Margins
            renderer.RenderingOptions.MarginTop = options.MarginTop;
            renderer.RenderingOptions.MarginBottom = options.MarginBottom;
            renderer.RenderingOptions.MarginLeft = options.MarginLeft;
            renderer.RenderingOptions.MarginRight = options.MarginRight;
            // Header
            if (options.UseHtmlHeader)
            {
                renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter
                {
                    MaxHeight = 50,
                    HtmlFragment = $@"
                <div style='width: 100%; font-size: 12px; font-family: Arial;'>
                    <div style='float: left; width: 50%;'>
                        <!-- Add your logo or dynamic content here -->
                        <img src='https://ironpdf.com/img/products/ironpdf-logo-text-dotnet.svg' height='40' />
                    </div>
                    <div style='float: right; width: 50%; text-align: right;'>
                        <strong>Invoice {invoice.InvoiceNumber}</strong><br/>
                        Generated: {DateTime.Now:yyyy-MM-dd}
                    </div>
                </div>",
                    LoadStylesAndCSSFromMainHtmlDocument = true
                };
            }
            else
            {
                renderer.RenderingOptions.TextHeader = new TextHeaderFooter
                {
                    CenterText = options.HeaderText,
                    Font = IronSoftware.Drawing.FontTypes.Arial,
                    FontSize = 12,
                    DrawDividerLine = true
                };
            }
            // Footer
            renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
            {
                MaxHeight = 30,
                HtmlFragment = @"
            <div style='width: 100%; font-size: 10px; color: #666;'>
                <div style='float: left; width: 33%;'>
                    © 2025 Your Company
                </div>
                <div style='float: center; width: 33%; text-align: center;'>
                    yourwebsite.com
                </div>
                <div style='float: right; width: 33%; text-align: right;'>
                    Page {page} of {total-pages}
                </div>
            </div>"
            };
            // Optional: Add watermark here (IronPDF supports adding after PDF is generated, so keep it as-is)
            // Margins, paper size etc., can also be set here if needed
            renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Portrait;
            renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
            renderer.RenderingOptions.PrintHtmlBackgrounds = true;
        }
        [HttpGet]
        public async Task<IActionResult> GenerateInvoice(string invoiceNumber)
        {
            var stopwatch = Stopwatch.StartNew();
            try
            {
                // Validate input
                if (string.IsNullOrEmpty(invoiceNumber))
                {
                    _logger.LogWarning("Invoice generation attempted without invoice number");
                    return BadRequest("Invoice number is required");
                }
                // Generate sample data (in production, fetch from database)
                var invoice = CreateSampleInvoice(invoiceNumber);
                // Log the generation attempt
                _logger.LogInformation($"Generating PDF for invoice {invoiceNumber}");
                // Configure PDF rendering options
                _pdfRenderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Portrait;
                _pdfRenderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
                _pdfRenderer.RenderingOptions.PrintHtmlBackgrounds = true;
                _pdfRenderer.RenderingOptions.CreatePdfFormsFromHtml = false;
                var options = new PdfStylingOptions
                {
                    MarginTop = 25,
                    MarginBottom = 25,
                    MarginLeft = 20,
                    MarginRight = 20,
                    UseHtmlHeader = true,
                    HeaderText = $"Invoice {invoice.InvoiceNumber}",
                    AddWatermark = false,
                    ForcePageBreaks = false
                };
                // Apply the styling to the renderer BEFORE rendering PDF
                ConfigurePdfRendererOptions(_pdfRenderer, invoice, options);
                // Render the view to PDF
                PdfDocument pdf;
                try
                {
                    pdf = _pdfRenderer.RenderRazorViewToPdf(
                        _viewRenderer,
                        "Views/Invoice/InvoiceTemplate.cshtml",
                        invoice);
                }
                catch (Exception renderEx)
                {
                    _logger.LogError(renderEx, "Failed to render Razor view to PDF");
                    throw new InvalidOperationException("PDF rendering failed. Please check the template.", renderEx);
                }
                // Apply metadata
                pdf.MetaData.Author = "PdfGeneratorApp";
                pdf.MetaData.Title = $"Invoice {invoice.InvoiceNumber}";
                pdf.MetaData.Subject = $"Invoice for {invoice.Customer.Name}";
                pdf.MetaData.Keywords = "invoice, billing, payment";
                pdf.MetaData.CreationDate = DateTime.UtcNow;
                pdf.MetaData.ModifiedDate = DateTime.UtcNow;
                // Optional: Add password protection
                // pdf.SecuritySettings.UserPassword = "user123";
                // pdf.SecuritySettings.OwnerPassword = "owner456";
                // pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
                // Log performance metrics
                stopwatch.Stop();
                _logger.LogInformation($"PDF generated successfully for invoice {invoiceNumber} in {stopwatch.ElapsedMilliseconds}ms");
                // Return the PDF file
                Response.Headers.Add("Content-Disposition", $"inline; filename=Invoice_{invoiceNumber}.pdf");
                return File(pdf.BinaryData, "application/pdf", $"Invoice_{invoiceNumber}.pdf");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"Error generating PDF for invoice {invoiceNumber}");
                // In development, return detailed error
                if (_environment.IsDevelopment())
                {
                    return StatusCode(500, new
                    {
                        error = "PDF generation failed",
                        message = ex.Message,
                        stackTrace = ex.StackTrace
                    });
                }
                // In production, return generic error
                return StatusCode(500, "An error occurred while generating the PDF");
            }
        }
        private InvoiceModel CreateSampleInvoice(string invoiceNumber)
        {
            return new InvoiceModel
            {
                InvoiceNumber = invoiceNumber,
                InvoiceDate = DateTime.Now,
                DueDate = DateTime.Now.AddDays(30),
                Vendor = new CompanyInfo
                {
                    Name = "Tech Solutions Inc.",
                    Address = "123 Business Ave",
                    City = "New York",
                    State = "NY",
                    ZipCode = "10001",
                    Email = "billing@techsolutions.com",
                    Phone = "(555) 123-4567"
                },
                Customer = new CompanyInfo
                {
                    Name = "Acme Corporation",
                    Address = "456 Commerce St",
                    City = "Los Angeles",
                    State = "CA",
                    ZipCode = "90001",
                    Email = "accounts@acmecorp.com",
                    Phone = "(555) 987-6543"
                },
                Items = new List<InvoiceItem>
                {
                    new InvoiceItem
                    {
                        Description = "Software Development Services - 40 hours",
                        Quantity = 40,
                        UnitPrice = 150.00m
                    },
                    new InvoiceItem
                    {
                        Description = "Project Management - 10 hours",
                        Quantity = 10,
                        UnitPrice = 120.00m
                    },
                    new InvoiceItem
                    {
                        Description = "Quality Assurance Testing",
                        Quantity = 1,
                        UnitPrice = 2500.00m
                    }
                },
                TaxRate = 8.875m,
                Notes = "Payment is due within 30 days. Late payments subject to 1.5% monthly interest.",
                PaymentTerms = "Net 30"
            };
        }
    }
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Code Explanation

You can see the brief differences between basic and styled headers. With IronPDF, you could even add customized HTML headers and footers to your invoice to further stylize it and truly make it your own.
For more in-depth information on adding headers and footers, please refer to this how-to guide.

Output

How to Generate a PDF in ASP.NET Using C#: Figure 5 - Styled PDF output

How to Implement High-Performance Batch PDF Processing?

Need to generate hundreds or thousands of PDFs? Here's how to achieve optimal performance with parallel processing while efficiently managing memory. Download our complete working example to see this in action.

For applications that need to generate multiple PDFs efficiently, here's an optimized batch processing implementation using async and multithreading techniques. This approach follows Microsoft's parallel programming best practices for optimal performance when generating PDFs in ASP.NET Core using C#:

using System.Collections.Concurrent;
using System.Diagnostics;
public class BatchPdfProcessor
{
    private readonly ChromePdfRenderer _renderer;
    private readonly ILogger<BatchPdfProcessor> _logger;
    private readonly SemaphoreSlim _semaphore;
    public BatchPdfProcessor(
        ChromePdfRenderer renderer,
        ILogger<BatchPdfProcessor> logger)
    {
        _renderer = renderer;
        _logger = logger;
        // Limit concurrent PDF generation to prevent memory exhaustion
        _semaphore = new SemaphoreSlim(Environment.ProcessorCount);
    }
    public async Task<BatchProcessingResult> ProcessBatchAsync(
        List<BatchPdfRequest> requests,
        IProgress<BatchProgressReport> progress = null)
    {
        var result = new BatchProcessingResult
        {
            StartTime = DateTime.UtcNow,
            TotalRequests = requests.Count
        };
        var successfulPdfs = new ConcurrentBag<GeneratedPdf>();
        var errors = new ConcurrentBag<ProcessingError>();
        var stopwatch = Stopwatch.StartNew();
        // Process PDFs in parallel with controlled concurrency
        var tasks = requests.Select(async (request, index) =>
        {
            await _semaphore.WaitAsync();
            try
            {
                var taskStopwatch = Stopwatch.StartNew();
                // Generate PDF
                var pdf = await GeneratePdfAsync(request);
                taskStopwatch.Stop();
                successfulPdfs.Add(new GeneratedPdf
                {
                    Id = request.Id,
                    FileName = request.FileName,
                    Data = pdf.BinaryData,
                    GenerationTime = taskStopwatch.ElapsedMilliseconds,
                    PageCount = pdf.PageCount
                });
                // Report progress
                progress?.Report(new BatchProgressReport
                {
                    ProcessedCount = successfulPdfs.Count + errors.Count,
                    TotalCount = requests.Count,
                    CurrentFile = request.FileName
                });
                _logger.LogDebug($"Generated PDF {request.Id} in {taskStopwatch.ElapsedMilliseconds}ms");
            }
            catch (Exception ex)
            {
                errors.Add(new ProcessingError
                {
                    RequestId = request.Id,
                    FileName = request.FileName,
                    Error = ex.Message,
                    StackTrace = ex.StackTrace
                });
                _logger.LogError(ex, $"Failed to generate PDF for request {request.Id}");
            }
            finally
            {
                _semaphore.Release();
            }
        });
        await Task.WhenAll(tasks);
        stopwatch.Stop();
        // Compile results
        result.EndTime = DateTime.UtcNow;
        result.TotalProcessingTime = stopwatch.ElapsedMilliseconds;
        result.SuccessfulPdfs = successfulPdfs.ToList();
        result.Errors = errors.ToList();
        result.SuccessCount = successfulPdfs.Count;
        result.ErrorCount = errors.Count;
        result.AverageGenerationTime = successfulPdfs.Any() 
            ? successfulPdfs.Average(p => p.GenerationTime) 
            : 0;
        result.TotalPages = successfulPdfs.Sum(p => p.PageCount);
        result.TotalSizeBytes = successfulPdfs.Sum(p => p.Data.Length);
        // Log summary
        _logger.LogInformation($"Batch processing completed: {result.SuccessCount} successful, " +
                             $"{result.ErrorCount} errors, {result.TotalProcessingTime}ms total time");
        // Clean up memory after large batch
        if (requests.Count > 100)
        {
            GC.Collect();
            GC.WaitForPendingFinalizers();
            GC.Collect();
        }
        return result;
    }
    private async Task<PdfDocument> GeneratePdfAsync(BatchPdfRequest request)
    {
        return await Task.Run(() =>
        {
            // Configure renderer for this specific request
            var localRenderer = new ChromePdfRenderer();
            localRenderer.RenderingOptions.PaperSize = request.PaperSize;
            localRenderer.RenderingOptions.MarginTop = request.MarginTop;
            localRenderer.RenderingOptions.MarginBottom = request.MarginBottom;
            // Generate PDF
            var pdf = localRenderer.RenderHtmlAsPdf(request.HtmlContent);
            // Apply compression if requested
            if (request.CompressImages)
            {
                pdf.CompressImages(request.CompressionQuality);
            }
            return pdf;
        });
    }
}
public class BatchPdfRequest
{
    public string Id { get; set; }
    public string FileName { get; set; }
    public string HtmlContent { get; set; }
    public IronPdf.Rendering.PdfPaperSize PaperSize { get; set; } = IronPdf.Rendering.PdfPaperSize.A4;
    public int MarginTop { get; set; } = 25;
    public int MarginBottom { get; set; } = 25;
    public bool CompressImages { get; set; } = true;
    public int CompressionQuality { get; set; } = 80;
}
public class BatchProcessingResult
{
    public DateTime StartTime { get; set; }
    public DateTime EndTime { get; set; }
    public long TotalProcessingTime { get; set; }
    public int TotalRequests { get; set; }
    public int SuccessCount { get; set; }
    public int ErrorCount { get; set; }
    public double AverageGenerationTime { get; set; }
    public int TotalPages { get; set; }
    public long TotalSizeBytes { get; set; }
    public List<GeneratedPdf> SuccessfulPdfs { get; set; }
    public List<ProcessingError> Errors { get; set; }
}
public class GeneratedPdf
{
    public string Id { get; set; }
    public string FileName { get; set; }
    public byte[] Data { get; set; }
    public long GenerationTime { get; set; }
    public int PageCount { get; set; }
}
public class ProcessingError
{
    public string RequestId { get; set; }
    public string FileName { get; set; }
    public string Error { get; set; }
    public string StackTrace { get; set; }
}
public class BatchProgressReport
{
    public int ProcessedCount { get; set; }
    public int TotalCount { get; set; }
    public string CurrentFile { get; set; }
    public double PercentComplete => (double)ProcessedCount / TotalCount * 100;
}
using System.Collections.Concurrent;
using System.Diagnostics;
public class BatchPdfProcessor
{
    private readonly ChromePdfRenderer _renderer;
    private readonly ILogger<BatchPdfProcessor> _logger;
    private readonly SemaphoreSlim _semaphore;
    public BatchPdfProcessor(
        ChromePdfRenderer renderer,
        ILogger<BatchPdfProcessor> logger)
    {
        _renderer = renderer;
        _logger = logger;
        // Limit concurrent PDF generation to prevent memory exhaustion
        _semaphore = new SemaphoreSlim(Environment.ProcessorCount);
    }
    public async Task<BatchProcessingResult> ProcessBatchAsync(
        List<BatchPdfRequest> requests,
        IProgress<BatchProgressReport> progress = null)
    {
        var result = new BatchProcessingResult
        {
            StartTime = DateTime.UtcNow,
            TotalRequests = requests.Count
        };
        var successfulPdfs = new ConcurrentBag<GeneratedPdf>();
        var errors = new ConcurrentBag<ProcessingError>();
        var stopwatch = Stopwatch.StartNew();
        // Process PDFs in parallel with controlled concurrency
        var tasks = requests.Select(async (request, index) =>
        {
            await _semaphore.WaitAsync();
            try
            {
                var taskStopwatch = Stopwatch.StartNew();
                // Generate PDF
                var pdf = await GeneratePdfAsync(request);
                taskStopwatch.Stop();
                successfulPdfs.Add(new GeneratedPdf
                {
                    Id = request.Id,
                    FileName = request.FileName,
                    Data = pdf.BinaryData,
                    GenerationTime = taskStopwatch.ElapsedMilliseconds,
                    PageCount = pdf.PageCount
                });
                // Report progress
                progress?.Report(new BatchProgressReport
                {
                    ProcessedCount = successfulPdfs.Count + errors.Count,
                    TotalCount = requests.Count,
                    CurrentFile = request.FileName
                });
                _logger.LogDebug($"Generated PDF {request.Id} in {taskStopwatch.ElapsedMilliseconds}ms");
            }
            catch (Exception ex)
            {
                errors.Add(new ProcessingError
                {
                    RequestId = request.Id,
                    FileName = request.FileName,
                    Error = ex.Message,
                    StackTrace = ex.StackTrace
                });
                _logger.LogError(ex, $"Failed to generate PDF for request {request.Id}");
            }
            finally
            {
                _semaphore.Release();
            }
        });
        await Task.WhenAll(tasks);
        stopwatch.Stop();
        // Compile results
        result.EndTime = DateTime.UtcNow;
        result.TotalProcessingTime = stopwatch.ElapsedMilliseconds;
        result.SuccessfulPdfs = successfulPdfs.ToList();
        result.Errors = errors.ToList();
        result.SuccessCount = successfulPdfs.Count;
        result.ErrorCount = errors.Count;
        result.AverageGenerationTime = successfulPdfs.Any() 
            ? successfulPdfs.Average(p => p.GenerationTime) 
            : 0;
        result.TotalPages = successfulPdfs.Sum(p => p.PageCount);
        result.TotalSizeBytes = successfulPdfs.Sum(p => p.Data.Length);
        // Log summary
        _logger.LogInformation($"Batch processing completed: {result.SuccessCount} successful, " +
                             $"{result.ErrorCount} errors, {result.TotalProcessingTime}ms total time");
        // Clean up memory after large batch
        if (requests.Count > 100)
        {
            GC.Collect();
            GC.WaitForPendingFinalizers();
            GC.Collect();
        }
        return result;
    }
    private async Task<PdfDocument> GeneratePdfAsync(BatchPdfRequest request)
    {
        return await Task.Run(() =>
        {
            // Configure renderer for this specific request
            var localRenderer = new ChromePdfRenderer();
            localRenderer.RenderingOptions.PaperSize = request.PaperSize;
            localRenderer.RenderingOptions.MarginTop = request.MarginTop;
            localRenderer.RenderingOptions.MarginBottom = request.MarginBottom;
            // Generate PDF
            var pdf = localRenderer.RenderHtmlAsPdf(request.HtmlContent);
            // Apply compression if requested
            if (request.CompressImages)
            {
                pdf.CompressImages(request.CompressionQuality);
            }
            return pdf;
        });
    }
}
public class BatchPdfRequest
{
    public string Id { get; set; }
    public string FileName { get; set; }
    public string HtmlContent { get; set; }
    public IronPdf.Rendering.PdfPaperSize PaperSize { get; set; } = IronPdf.Rendering.PdfPaperSize.A4;
    public int MarginTop { get; set; } = 25;
    public int MarginBottom { get; set; } = 25;
    public bool CompressImages { get; set; } = true;
    public int CompressionQuality { get; set; } = 80;
}
public class BatchProcessingResult
{
    public DateTime StartTime { get; set; }
    public DateTime EndTime { get; set; }
    public long TotalProcessingTime { get; set; }
    public int TotalRequests { get; set; }
    public int SuccessCount { get; set; }
    public int ErrorCount { get; set; }
    public double AverageGenerationTime { get; set; }
    public int TotalPages { get; set; }
    public long TotalSizeBytes { get; set; }
    public List<GeneratedPdf> SuccessfulPdfs { get; set; }
    public List<ProcessingError> Errors { get; set; }
}
public class GeneratedPdf
{
    public string Id { get; set; }
    public string FileName { get; set; }
    public byte[] Data { get; set; }
    public long GenerationTime { get; set; }
    public int PageCount { get; set; }
}
public class ProcessingError
{
    public string RequestId { get; set; }
    public string FileName { get; set; }
    public string Error { get; set; }
    public string StackTrace { get; set; }
}
public class BatchProgressReport
{
    public int ProcessedCount { get; set; }
    public int TotalCount { get; set; }
    public string CurrentFile { get; set; }
    public double PercentComplete => (double)ProcessedCount / TotalCount * 100;
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Real-World Healthcare Report Example

Here's a specific implementation for generating HIPAA-compliant medical reports:

public class MedicalReportGenerator
{
    private readonly ChromePdfRenderer _renderer;
    private readonly ILogger<MedicalReportGenerator> _logger;
    public MedicalReportGenerator(
        ChromePdfRenderer renderer,
        ILogger<MedicalReportGenerator> logger)
    {
        _renderer = renderer;
        _logger = logger;
    }
    public async Task<PdfDocument> GeneratePatientReport(PatientReportModel model)
    {
        var stopwatch = Stopwatch.StartNew();
        // Configure for medical document standards
        _renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.Letter;
        _renderer.RenderingOptions.MarginTop = 50;
        _renderer.RenderingOptions.MarginBottom = 40;
        // HIPAA-compliant header
        _renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter
        {
            Height = 45,
            HtmlFragment = $@"
                <div style='width: 100%; font-size: 10px;'>
                    <div style='float: left;'>
                        <strong>CONFIDENTIAL MEDICAL RECORD</strong><br/>
                        Patient: {model.PatientName} | MRN: {model.MedicalRecordNumber}
                    </div>
                    <div style='float: right; text-align: right;'>
                        Generated: {{date}} {{time}}<br/>
                        Provider: {model.ProviderName}
                    </div>
                </div>"
        };
        // Generate report HTML
        var html = GenerateMedicalReportHtml(model);
        // Create PDF with encryption for HIPAA compliance
        var pdf = _renderer.RenderHtmlAsPdf(html);
        // Apply 256-bit AES encryption
        pdf.SecuritySettings.UserPassword = GenerateSecurePassword();
        pdf.SecuritySettings.OwnerPassword = GenerateOwnerPassword();
        pdf.SecuritySettings.AllowUserCopyPasteContent = false;
        pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.NoPrint;
        pdf.SecuritySettings.AllowUserFormData = false;
        pdf.SecuritySettings.AllowUserAnnotations = false;
        // Add audit metadata
        pdf.MetaData.Author = model.ProviderName;
        pdf.MetaData.Title = $"Medical Report - {model.PatientName}";
        pdf.MetaData.Keywords = "medical,confidential,hipaa";
        pdf.MetaData.CustomProperties.Add("ReportType", model.ReportType);
        pdf.MetaData.CustomProperties.Add("GeneratedBy", model.UserId);
        pdf.MetaData.CustomProperties.Add("Timestamp", DateTime.UtcNow.ToString("O"));
        stopwatch.Stop();
        _logger.LogInformation($"Medical report generated in {stopwatch.ElapsedMilliseconds}ms for patient {model.MedicalRecordNumber}");
        return pdf;
    }
    private string GenerateMedicalReportHtml(PatientReportModel model)
    {
        // Generate comprehensive medical report HTML
        // This would typically use a Razor view in production
        return $@"
            <!DOCTYPE html>
            <html>
            <head>
                <style>
                    body {{ font-family: 'Segoe UI', Arial, sans-serif; margin: 0; padding: 20px; }}
                    .header {{ background: #f0f4f8; padding: 20px; margin-bottom: 30px; }}
                    .patient-info {{ display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 30px; }}
                    .section {{ margin-bottom: 30px; }}
                    .section h2 {{ color: #2c3e50; border-bottom: 2px solid #3498db; padding-bottom: 10px; }}
                    .vital-signs {{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }}
                    .vital-box {{ background: #ecf0f1; padding: 15px; border-radius: 5px; }}
                    .medication-table {{ width: 100%; border-collapse: collapse; }}
                    .medication-table th, .medication-table td {{ border: 1px solid #ddd; padding: 10px; text-align: left; }}
                    .medication-table th {{ background: #3498db; color: white; }}
                    .alert {{ background: #e74c3c; color: white; padding: 10px; border-radius: 5px; margin-bottom: 20px; }}
                </style>
            </head>
            <body>
                <div class='header'>
                    <h1>Patient Medical Report</h1>
                    <p>Report Date: {DateTime.Now:MMMM dd, yyyy}</p>
                </div>
                {(model.HasAllergies ? "<div class='alert'>⚠ PATIENT HAS KNOWN ALLERGIES - SEE ALLERGY SECTION</div>" : "")}
                <div class='patient-info'>
                    <div>
                        <strong>Patient Name:</strong> {model.PatientName}<br/>
                        <strong>Date of Birth:</strong> {model.DateOfBirth:MM/dd/yyyy}<br/>
                        <strong>Age:</strong> {model.Age} years<br/>
                        <strong>Gender:</strong> {model.Gender}
                    </div>
                    <div>
                        <strong>MRN:</strong> {model.MedicalRecordNumber}<br/>
                        <strong>Admission Date:</strong> {model.AdmissionDate:MM/dd/yyyy}<br/>
                        <strong>Provider:</strong> {model.ProviderName}<br/>
                        <strong>Department:</strong> {model.Department}
                    </div>
                </div>
                <div class='section'>
                    <h2>Vital Signs</h2>
                    <div class='vital-signs'>
                        <div class='vital-box'>
                            <strong>Blood Pressure</strong><br/>
                            {model.BloodPressure}
                        </div>
                        <div class='vital-box'>
                            <strong>Heart Rate</strong><br/>
                            {model.HeartRate} bpm
                        </div>
                        <div class='vital-box'>
                            <strong>Temperature</strong><br/>
                            {model.Temperature}°F
                        </div>
                        <div class='vital-box'>
                            <strong>Respiratory Rate</strong><br/>
                            {model.RespiratoryRate} /min
                        </div>
                        <div class='vital-box'>
                            <strong>O2 Saturation</strong><br/>
                            {model.OxygenSaturation}%
                        </div>
                        <div class='vital-box'>
                            <strong>Weight</strong><br/>
                            {model.Weight} lbs
                        </div>
                    </div>
                </div>
                <div class='section'>
                    <h2>Current Medications</h2>
                    <table class='medication-table'>
                        <thead>
                            <tr>
                                <th>Medication</th>
                                <th>Dosage</th>
                                <th>Frequency</th>
                                <th>Route</th>
                                <th>Start Date</th>
                            </tr>
                        </thead>
                        <tbody>
                            {string.Join("", model.Medications.Select(m => $@"
                                <tr>
                                    <td>{m.Name}</td>
                                    <td>{m.Dosage}</td>
                                    <td>{m.Frequency}</td>
                                    <td>{m.Route}</td>
                                    <td>{m.StartDate:MM/dd/yyyy}</td>
                                </tr>
                            "))}
                        </tbody>
                    </table>
                </div>
                <div class='section'>
                    <h2>Clinical Notes</h2>
                    <p>{model.ClinicalNotes}</p>
                </div>
                <div class='section'>
                    <h2>Treatment Plan</h2>
                    <p>{model.TreatmentPlan}</p>
                </div>
            </body>
            </html>";
    }
    private string GenerateSecurePassword()
    {
        // Generate cryptographically secure password
        using var rng = System.Security.Cryptography.RandomNumberGenerator.Create();
        var bytes = new byte[32];
        rng.GetBytes(bytes);
        return Convert.ToBase64String(bytes);
    }
    private string GenerateOwnerPassword()
    {
        // In production, retrieve from secure configuration
        return "SecureOwnerPassword123!";
    }
}
public class PatientReportModel
{
    public string PatientName { get; set; }
    public string MedicalRecordNumber { get; set; }
    public DateTime DateOfBirth { get; set; }
    public int Age { get; set; }
    public string Gender { get; set; }
    public DateTime AdmissionDate { get; set; }
    public string ProviderName { get; set; }
    public string Department { get; set; }
    public string ReportType { get; set; }
    public string UserId { get; set; }
    // Vital Signs
    public string BloodPressure { get; set; }
    public int HeartRate { get; set; }
    public decimal Temperature { get; set; }
    public int RespiratoryRate { get; set; }
    public int OxygenSaturation { get; set; }
    public decimal Weight { get; set; }
    // Medical Information
    public bool HasAllergies { get; set; }
    public List<Medication> Medications { get; set; }
    public string ClinicalNotes { get; set; }
    public string TreatmentPlan { get; set; }
}
public class Medication
{
    public string Name { get; set; }
    public string Dosage { get; set; }
    public string Frequency { get; set; }
    public string Route { get; set; }
    public DateTime StartDate { get; set; }
}
public class MedicalReportGenerator
{
    private readonly ChromePdfRenderer _renderer;
    private readonly ILogger<MedicalReportGenerator> _logger;
    public MedicalReportGenerator(
        ChromePdfRenderer renderer,
        ILogger<MedicalReportGenerator> logger)
    {
        _renderer = renderer;
        _logger = logger;
    }
    public async Task<PdfDocument> GeneratePatientReport(PatientReportModel model)
    {
        var stopwatch = Stopwatch.StartNew();
        // Configure for medical document standards
        _renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.Letter;
        _renderer.RenderingOptions.MarginTop = 50;
        _renderer.RenderingOptions.MarginBottom = 40;
        // HIPAA-compliant header
        _renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter
        {
            Height = 45,
            HtmlFragment = $@"
                <div style='width: 100%; font-size: 10px;'>
                    <div style='float: left;'>
                        <strong>CONFIDENTIAL MEDICAL RECORD</strong><br/>
                        Patient: {model.PatientName} | MRN: {model.MedicalRecordNumber}
                    </div>
                    <div style='float: right; text-align: right;'>
                        Generated: {{date}} {{time}}<br/>
                        Provider: {model.ProviderName}
                    </div>
                </div>"
        };
        // Generate report HTML
        var html = GenerateMedicalReportHtml(model);
        // Create PDF with encryption for HIPAA compliance
        var pdf = _renderer.RenderHtmlAsPdf(html);
        // Apply 256-bit AES encryption
        pdf.SecuritySettings.UserPassword = GenerateSecurePassword();
        pdf.SecuritySettings.OwnerPassword = GenerateOwnerPassword();
        pdf.SecuritySettings.AllowUserCopyPasteContent = false;
        pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.NoPrint;
        pdf.SecuritySettings.AllowUserFormData = false;
        pdf.SecuritySettings.AllowUserAnnotations = false;
        // Add audit metadata
        pdf.MetaData.Author = model.ProviderName;
        pdf.MetaData.Title = $"Medical Report - {model.PatientName}";
        pdf.MetaData.Keywords = "medical,confidential,hipaa";
        pdf.MetaData.CustomProperties.Add("ReportType", model.ReportType);
        pdf.MetaData.CustomProperties.Add("GeneratedBy", model.UserId);
        pdf.MetaData.CustomProperties.Add("Timestamp", DateTime.UtcNow.ToString("O"));
        stopwatch.Stop();
        _logger.LogInformation($"Medical report generated in {stopwatch.ElapsedMilliseconds}ms for patient {model.MedicalRecordNumber}");
        return pdf;
    }
    private string GenerateMedicalReportHtml(PatientReportModel model)
    {
        // Generate comprehensive medical report HTML
        // This would typically use a Razor view in production
        return $@"
            <!DOCTYPE html>
            <html>
            <head>
                <style>
                    body {{ font-family: 'Segoe UI', Arial, sans-serif; margin: 0; padding: 20px; }}
                    .header {{ background: #f0f4f8; padding: 20px; margin-bottom: 30px; }}
                    .patient-info {{ display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 30px; }}
                    .section {{ margin-bottom: 30px; }}
                    .section h2 {{ color: #2c3e50; border-bottom: 2px solid #3498db; padding-bottom: 10px; }}
                    .vital-signs {{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }}
                    .vital-box {{ background: #ecf0f1; padding: 15px; border-radius: 5px; }}
                    .medication-table {{ width: 100%; border-collapse: collapse; }}
                    .medication-table th, .medication-table td {{ border: 1px solid #ddd; padding: 10px; text-align: left; }}
                    .medication-table th {{ background: #3498db; color: white; }}
                    .alert {{ background: #e74c3c; color: white; padding: 10px; border-radius: 5px; margin-bottom: 20px; }}
                </style>
            </head>
            <body>
                <div class='header'>
                    <h1>Patient Medical Report</h1>
                    <p>Report Date: {DateTime.Now:MMMM dd, yyyy}</p>
                </div>
                {(model.HasAllergies ? "<div class='alert'>⚠ PATIENT HAS KNOWN ALLERGIES - SEE ALLERGY SECTION</div>" : "")}
                <div class='patient-info'>
                    <div>
                        <strong>Patient Name:</strong> {model.PatientName}<br/>
                        <strong>Date of Birth:</strong> {model.DateOfBirth:MM/dd/yyyy}<br/>
                        <strong>Age:</strong> {model.Age} years<br/>
                        <strong>Gender:</strong> {model.Gender}
                    </div>
                    <div>
                        <strong>MRN:</strong> {model.MedicalRecordNumber}<br/>
                        <strong>Admission Date:</strong> {model.AdmissionDate:MM/dd/yyyy}<br/>
                        <strong>Provider:</strong> {model.ProviderName}<br/>
                        <strong>Department:</strong> {model.Department}
                    </div>
                </div>
                <div class='section'>
                    <h2>Vital Signs</h2>
                    <div class='vital-signs'>
                        <div class='vital-box'>
                            <strong>Blood Pressure</strong><br/>
                            {model.BloodPressure}
                        </div>
                        <div class='vital-box'>
                            <strong>Heart Rate</strong><br/>
                            {model.HeartRate} bpm
                        </div>
                        <div class='vital-box'>
                            <strong>Temperature</strong><br/>
                            {model.Temperature}°F
                        </div>
                        <div class='vital-box'>
                            <strong>Respiratory Rate</strong><br/>
                            {model.RespiratoryRate} /min
                        </div>
                        <div class='vital-box'>
                            <strong>O2 Saturation</strong><br/>
                            {model.OxygenSaturation}%
                        </div>
                        <div class='vital-box'>
                            <strong>Weight</strong><br/>
                            {model.Weight} lbs
                        </div>
                    </div>
                </div>
                <div class='section'>
                    <h2>Current Medications</h2>
                    <table class='medication-table'>
                        <thead>
                            <tr>
                                <th>Medication</th>
                                <th>Dosage</th>
                                <th>Frequency</th>
                                <th>Route</th>
                                <th>Start Date</th>
                            </tr>
                        </thead>
                        <tbody>
                            {string.Join("", model.Medications.Select(m => $@"
                                <tr>
                                    <td>{m.Name}</td>
                                    <td>{m.Dosage}</td>
                                    <td>{m.Frequency}</td>
                                    <td>{m.Route}</td>
                                    <td>{m.StartDate:MM/dd/yyyy}</td>
                                </tr>
                            "))}
                        </tbody>
                    </table>
                </div>
                <div class='section'>
                    <h2>Clinical Notes</h2>
                    <p>{model.ClinicalNotes}</p>
                </div>
                <div class='section'>
                    <h2>Treatment Plan</h2>
                    <p>{model.TreatmentPlan}</p>
                </div>
            </body>
            </html>";
    }
    private string GenerateSecurePassword()
    {
        // Generate cryptographically secure password
        using var rng = System.Security.Cryptography.RandomNumberGenerator.Create();
        var bytes = new byte[32];
        rng.GetBytes(bytes);
        return Convert.ToBase64String(bytes);
    }
    private string GenerateOwnerPassword()
    {
        // In production, retrieve from secure configuration
        return "SecureOwnerPassword123!";
    }
}
public class PatientReportModel
{
    public string PatientName { get; set; }
    public string MedicalRecordNumber { get; set; }
    public DateTime DateOfBirth { get; set; }
    public int Age { get; set; }
    public string Gender { get; set; }
    public DateTime AdmissionDate { get; set; }
    public string ProviderName { get; set; }
    public string Department { get; set; }
    public string ReportType { get; set; }
    public string UserId { get; set; }
    // Vital Signs
    public string BloodPressure { get; set; }
    public int HeartRate { get; set; }
    public decimal Temperature { get; set; }
    public int RespiratoryRate { get; set; }
    public int OxygenSaturation { get; set; }
    public decimal Weight { get; set; }
    // Medical Information
    public bool HasAllergies { get; set; }
    public List<Medication> Medications { get; set; }
    public string ClinicalNotes { get; set; }
    public string TreatmentPlan { get; set; }
}
public class Medication
{
    public string Name { get; set; }
    public string Dosage { get; set; }
    public string Frequency { get; set; }
    public string Route { get; set; }
    public DateTime StartDate { get; set; }
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Security Considerations

When generating PDFs in production environments or when working with sensitive information, security is paramount. IronPDF provides several security features:

Applying Security Settings

using System.Text.RegularExpressions;
namespace PdfGeneratorApp.Utilities
{
    public static class PdfSecurityHelper
    {
        public static void ApplySecuritySettings(PdfDocument pdf, SecurityLevel level)
        {
            switch (level)
            {
                case SecurityLevel.Low:
                    // Basic protection
                    pdf.SecuritySettings.AllowUserCopyPasteContent = true;
                    pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
                    break;
                case SecurityLevel.Medium:
                    // Restricted copying
                    pdf.SecuritySettings.UserPassword = GeneratePassword(8);
                    pdf.SecuritySettings.AllowUserCopyPasteContent = false;
                    pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.PrintLowQuality;
                    break;
                case SecurityLevel.High:
                    // Maximum security
                    pdf.SecuritySettings.UserPassword = GeneratePassword(16);
                    pdf.SecuritySettings.OwnerPassword = GeneratePassword(16);
                    pdf.SecuritySettings.AllowUserCopyPasteContent = false;
                    pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.NoPrint;
                    pdf.SecuritySettings.AllowUserAnnotations = false;
                    pdf.SecuritySettings.AllowUserFormData = false;
                    break;
            }
        }
    public enum SecurityLevel
    {
        Low,
        Medium,
        High
    }
}
using System.Text.RegularExpressions;
namespace PdfGeneratorApp.Utilities
{
    public static class PdfSecurityHelper
    {
        public static void ApplySecuritySettings(PdfDocument pdf, SecurityLevel level)
        {
            switch (level)
            {
                case SecurityLevel.Low:
                    // Basic protection
                    pdf.SecuritySettings.AllowUserCopyPasteContent = true;
                    pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
                    break;
                case SecurityLevel.Medium:
                    // Restricted copying
                    pdf.SecuritySettings.UserPassword = GeneratePassword(8);
                    pdf.SecuritySettings.AllowUserCopyPasteContent = false;
                    pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.PrintLowQuality;
                    break;
                case SecurityLevel.High:
                    // Maximum security
                    pdf.SecuritySettings.UserPassword = GeneratePassword(16);
                    pdf.SecuritySettings.OwnerPassword = GeneratePassword(16);
                    pdf.SecuritySettings.AllowUserCopyPasteContent = false;
                    pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.NoPrint;
                    pdf.SecuritySettings.AllowUserAnnotations = false;
                    pdf.SecuritySettings.AllowUserFormData = false;
                    break;
            }
        }
    public enum SecurityLevel
    {
        Low,
        Medium,
        High
    }
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

In the helper class above, we use the SecurityLevel enum to set different security options for the PDF. For example, the low SecurityLevel applies basic protection but still allows FullPrintRights and copying and pasting from the PDF by setting the property AllowUserCopyPasteContent to true. These settings are enabled by adjusting the PDF class properties with IronPDF. For a complete list of properties and options for security, please consult the how-to guide.

Error Handling and Troubleshooting

Common issues and their solutions for generating PDFs in ASP.NET Core have been extensively discussed in the developer community. Here are proven solutions for the most frequent challenges:

Memory Management

For detailed guidance on handling memory leaks in IronPDF, implement the following pattern:

public class PdfMemoryManager : IDisposable
{
    private readonly List<PdfDocument> _openDocuments = new();
    private readonly ILogger<PdfMemoryManager> _logger;
    private bool _disposed;
    public PdfMemoryManager(ILogger<PdfMemoryManager> logger)
    {
        _logger = logger;
    }
    public PdfDocument CreateDocument(ChromePdfRenderer renderer, string html)
    {
        try
        {
            var pdf = renderer.RenderHtmlAsPdf(html);
            _openDocuments.Add(pdf);
            return pdf;
        }
        catch (OutOfMemoryException ex)
        {
            _logger.LogError(ex, "Out of memory while generating PDF");
            // Force garbage collection
            CleanupMemory();
            // Retry with reduced quality
            renderer.RenderingOptions.JpegQuality = 50;
            var pdf = renderer.RenderHtmlAsPdf(html);
            _openDocuments.Add(pdf);
            return pdf;
        }
    }
    private void CleanupMemory()
    {
        // Dispose all open documents
        foreach (var doc in _openDocuments)
        {
            doc?.Dispose();
        }
        _openDocuments.Clear();
        // Force garbage collection
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();
        _logger.LogInformation("Memory cleanup performed");
    }
    public void Dispose()
    {
        if (!_disposed)
        {
            CleanupMemory();
            _disposed = true;
        }
    }
}
public class PdfMemoryManager : IDisposable
{
    private readonly List<PdfDocument> _openDocuments = new();
    private readonly ILogger<PdfMemoryManager> _logger;
    private bool _disposed;
    public PdfMemoryManager(ILogger<PdfMemoryManager> logger)
    {
        _logger = logger;
    }
    public PdfDocument CreateDocument(ChromePdfRenderer renderer, string html)
    {
        try
        {
            var pdf = renderer.RenderHtmlAsPdf(html);
            _openDocuments.Add(pdf);
            return pdf;
        }
        catch (OutOfMemoryException ex)
        {
            _logger.LogError(ex, "Out of memory while generating PDF");
            // Force garbage collection
            CleanupMemory();
            // Retry with reduced quality
            renderer.RenderingOptions.JpegQuality = 50;
            var pdf = renderer.RenderHtmlAsPdf(html);
            _openDocuments.Add(pdf);
            return pdf;
        }
    }
    private void CleanupMemory()
    {
        // Dispose all open documents
        foreach (var doc in _openDocuments)
        {
            doc?.Dispose();
        }
        _openDocuments.Clear();
        // Force garbage collection
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();
        _logger.LogInformation("Memory cleanup performed");
    }
    public void Dispose()
    {
        if (!_disposed)
        {
            CleanupMemory();
            _disposed = true;
        }
    }
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Font Rendering Issues

public class FontTroubleshooter
{
    public static void EnsureFontsAvailable(ChromePdfRenderer renderer)
    {
        // Embed fonts in the PDF
        renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print;
        // Use web-safe fonts as fallback
        var fontFallback = @"
            <style>
                body {
                    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
                }
                @font-face {
                    font-family: 'CustomFont';
                    src: url('data:font/woff2;base64,YOUR_BASE64_FONT_HERE') format('woff2');
                }
            </style>";
        // Add to HTML head
        renderer.RenderingOptions.CustomCssUrl = "https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;700&display=swap";
    }
}
public class FontTroubleshooter
{
    public static void EnsureFontsAvailable(ChromePdfRenderer renderer)
    {
        // Embed fonts in the PDF
        renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print;
        // Use web-safe fonts as fallback
        var fontFallback = @"
            <style>
                body {
                    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
                }
                @font-face {
                    font-family: 'CustomFont';
                    src: url('data:font/woff2;base64,YOUR_BASE64_FONT_HERE') format('woff2');
                }
            </style>";
        // Add to HTML head
        renderer.RenderingOptions.CustomCssUrl = "https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;700&display=swap";
    }
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Common Exceptions and Solutions

Exception

Cause

Solution

IronPdf.Exceptions.IronPdfNativeException

Chrome engine initialization failed

Ensure Visual C++ Redistributables are installed

System.UnauthorizedAccessException

Insufficient permissions

Grant write access to the temp folder

System.TimeoutException

JavaScript is taking too long

Increase RenderDelay or disable JavaScript

System.OutOfMemoryException

Large PDF or batch processing

Implement pagination or reduce image quality

IronPdf.Exceptions.IronPdfLicensingException

Invalid or expired license

Verify the license key in the configuration

Debugging Tips

With IronPDF, you can easily debug and log all processes run by your application to search and verify any inputs and outputs. To enable logging, set `EnableDebugging` to true and specify a file path for the log by assigning a value to the LogFilePath property. Here's a quick code snippet showing how to do that.

public class PdfDebugger
{
    private readonly ILogger<PdfDebugger> _logger;
    public PdfDebugger(ILogger<PdfDebugger> logger)
    {
        _logger = logger;
    }
    public void EnableDebugging(ChromePdfRenderer renderer)
    {
        // Enable detailed logging
        IronPdf.Logging.Logger.EnableDebugging = true;
        IronPdf.Logging.Logger.LogFilePath = "IronPdf.log";
        IronPdf.Logging.Logger.LoggingMode = IronPdf.Logging.Logger.LoggingModes.All;
        // Log rendering settings
        _logger.LogDebug($"Paper Size: {renderer.RenderingOptions.PaperSize}");
        _logger.LogDebug($"Margins: T{renderer.RenderingOptions.MarginTop} " +
                         $"B{renderer.RenderingOptions.MarginBottom} " +
                         $"L{renderer.RenderingOptions.MarginLeft} " +
                         $"R{renderer.RenderingOptions.MarginRight}");
        _logger.LogDebug($"JavaScript Enabled: {renderer.RenderingOptions.EnableJavaScript}");
        _logger.LogDebug($"Render Delay: {renderer.RenderingOptions.RenderDelay}ms");
    }
    public void SaveDebugHtml(string html, string fileName)
    {
        // Save HTML for inspection
        var debugPath = Path.Combine("debug", $"{fileName}_{DateTime.Now:yyyyMMdd_HHmmss}.html");
        Directory.CreateDirectory("debug");
        File.WriteAllText(debugPath, html);
        _logger.LogDebug($"Debug HTML saved to: {debugPath}");
    }
}
public class PdfDebugger
{
    private readonly ILogger<PdfDebugger> _logger;
    public PdfDebugger(ILogger<PdfDebugger> logger)
    {
        _logger = logger;
    }
    public void EnableDebugging(ChromePdfRenderer renderer)
    {
        // Enable detailed logging
        IronPdf.Logging.Logger.EnableDebugging = true;
        IronPdf.Logging.Logger.LogFilePath = "IronPdf.log";
        IronPdf.Logging.Logger.LoggingMode = IronPdf.Logging.Logger.LoggingModes.All;
        // Log rendering settings
        _logger.LogDebug($"Paper Size: {renderer.RenderingOptions.PaperSize}");
        _logger.LogDebug($"Margins: T{renderer.RenderingOptions.MarginTop} " +
                         $"B{renderer.RenderingOptions.MarginBottom} " +
                         $"L{renderer.RenderingOptions.MarginLeft} " +
                         $"R{renderer.RenderingOptions.MarginRight}");
        _logger.LogDebug($"JavaScript Enabled: {renderer.RenderingOptions.EnableJavaScript}");
        _logger.LogDebug($"Render Delay: {renderer.RenderingOptions.RenderDelay}ms");
    }
    public void SaveDebugHtml(string html, string fileName)
    {
        // Save HTML for inspection
        var debugPath = Path.Combine("debug", $"{fileName}_{DateTime.Now:yyyyMMdd_HHmmss}.html");
        Directory.CreateDirectory("debug");
        File.WriteAllText(debugPath, html);
        _logger.LogDebug($"Debug HTML saved to: {debugPath}");
    }
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Local Deployment Best Practices

IIS Configuration

For deploying to IIS, ensure proper configuration:

<!-- web.config -->
<configuration>
  <system.webServer>
    <!-- Enable 64-bit mode for better memory handling -->
    <applicationPool>
      <processModel enable32BitAppOnWin64="false" />
    </applicationPool>
    <!-- Increase request timeout for large PDFs -->
    <httpRuntime executionTimeout="300" maxRequestLength="51200" />
    <!-- Configure temp folder permissions -->
    <system.web>
      <compilation tempDirectory="~/App_Data/Temp/" />
    </system.web>
  </system.webServer>
</configuration>
<!-- web.config -->
<configuration>
  <system.webServer>
    <!-- Enable 64-bit mode for better memory handling -->
    <applicationPool>
      <processModel enable32BitAppOnWin64="false" />
    </applicationPool>
    <!-- Increase request timeout for large PDFs -->
    <httpRuntime executionTimeout="300" maxRequestLength="51200" />
    <!-- Configure temp folder permissions -->
    <system.web>
      <compilation tempDirectory="~/App_Data/Temp/" />
    </system.web>
  </system.webServer>
</configuration>
XML

Required Dependencies

Ensure these components are installed on your deployment server:

  1. .NET Runtime - Version 6.0 or later
  2. Visual C++ Redistributables - 2015-2022 (x64)
  3. Windows Server - 2012 R2 or later recommended

File System Permissions

# Grant IIS_IUSRS write access to temp folder
icacls "C:\inetpub\wwwroot\YourApp\App_Data\Temp" /grant "IIS_IUSRS:(OI)(CI)M" /T
# Grant access to IronPDF cache folder
icacls "C:\Windows\Temp\IronPdf" /grant "IIS_IUSRS:(OI)(CI)M" /T
# Grant IIS_IUSRS write access to temp folder
icacls "C:\inetpub\wwwroot\YourApp\App_Data\Temp" /grant "IIS_IUSRS:(OI)(CI)M" /T
# Grant access to IronPDF cache folder
icacls "C:\Windows\Temp\IronPdf" /grant "IIS_IUSRS:(OI)(CI)M" /T
SHELL

Performance Tuning

// Startup.cs or Program.cs
public void ConfigureServices(IServiceCollection services)
{
    // Configure IronPDF for production
    services.AddSingleton<ChromePdfRenderer>(provider =>
    {
        var renderer = new ChromePdfRenderer();
        // Production optimizations
        renderer.RenderingOptions.RenderDelay = 50; // Minimize delay
        renderer.RenderingOptions.Timeout = 120; // 2 minutes max
        renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print;
        // Enable caching for static resources
        Installation.ChromeGpuMode = IronPdf.Engines.Chrome.ChromeGpuModes.Disabled;
        Installation.LinuxAndDockerDependenciesAutoConfig = false;
        return renderer;
    });
    // Configure memory cache for generated PDFs
    services.AddMemoryCache(options =>
    {
        options.SizeLimit = 100_000_000; // 100 MB cache
    });
}
// Startup.cs or Program.cs
public void ConfigureServices(IServiceCollection services)
{
    // Configure IronPDF for production
    services.AddSingleton<ChromePdfRenderer>(provider =>
    {
        var renderer = new ChromePdfRenderer();
        // Production optimizations
        renderer.RenderingOptions.RenderDelay = 50; // Minimize delay
        renderer.RenderingOptions.Timeout = 120; // 2 minutes max
        renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print;
        // Enable caching for static resources
        Installation.ChromeGpuMode = IronPdf.Engines.Chrome.ChromeGpuModes.Disabled;
        Installation.LinuxAndDockerDependenciesAutoConfig = false;
        return renderer;
    });
    // Configure memory cache for generated PDFs
    services.AddMemoryCache(options =>
    {
        options.SizeLimit = 100_000_000; // 100 MB cache
    });
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Best Practices Summary

  1. Always dispose of PdfDocument objects to prevent memory leaks
  2. Reuse ChromePdfRenderer instances for better performance
  3. Implement proper error handling with detailed logging
  4. Sanitize all user input before PDF generation
  5. Use async/await patterns for better scalability
  6. Configure appropriate timeouts for JavaScript rendering
  7. Compress images to reduce file size
  8. Cache generated PDFs when the content is static
  9. Monitor memory usage during batch processing
  10. Test with production-like data volumes before deployment

Transform Your ASP.NET Application Today

You now have a comprehensive understanding of generating PDFs in ASP.NET Core using C# with IronPDF. From basic Razor view conversion to advanced batch processing with performance optimization, you're equipped to implement professional PDF generation that matches precisely what you see in Chrome.

Key achievements you've unlocked:

  • Pixel-perfect rendering using IronPDF's Chrome engine that eliminates formatting surprises when you create a PDF from HTML pages, web pages, etc.
  • Production-ready templates with Razor views providing familiar, maintainable PDF generation
  • Enterprise-grade error handling and memory management for reliable operation at scale
  • Optimized batch processing with parallel generation, handling thousands of documents
  • Professional security features protecting sensitive documents with 256-bit encryption

Start Building Professional PDFs Now

立即開始使用 IronPDF。
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Ready to implement PDF generation in your ASP.NET Core application? Download IronPDF's free trial today and experience the power of professional PDF generation with no watermarks or limitations for 30 days. With comprehensive documentation, responsive engineering support, and a 30-day money-back guarantee, you can confidently build production-ready PDF solutions.

Essential Resources for Your Journey

Transform your ASP.NET Core applications with enterprise-grade PDF generation that works as expected and start building with IronPDF today!

常見問題解答

IronPDF 在 ASP.NET 應用程式中的主要用途是什麼？

IronPDF 主要用於產生、編輯和提取 PDF 文件中的內容，因此是 ASP.NET 應用程式中建立發票、報告、憑證或票據的重要工具。

IronPDF 如何確保 PDF 渲染像素級完美？

IronPDF 利用先進的渲染引擎和企業級功能，確保像素級完美渲染，可將 HTML、圖像或其他文件格式精確轉換為高品質的 PDF。

IronPDF 能否與 ASP.NET Core 應用程式整合？

是的，IronPDF 可以與 ASP.NET Core 應用程式無縫集成，為開發人員提供一個強大的程式庫來有效率地處理各種 PDF 任務。

使用 IronPDF 產生 PDF 檔案有哪些好處？

使用 IronPDF 產生 PDF 具有諸多優勢，例如易於使用、高品質渲染、支援複雜的文件功能以及能夠在應用程式中自動執行 PDF 任務。

IronPDF是否支援編輯現有PDF文件？

是的，IronPDF 支援編輯現有的 PDF 文檔，允許開發人員以程式設計方式修改內容、新增註釋和更新 PDF 元資料。

IronPDF 是否適合建立企業級 PDF 文件？

IronPDF 具有強大的功能，包括支援複雜的文件結構以及加密和數位簽章等安全功能，因此是建立企業級 PDF 文件的理想選擇。

IronPDF可以將哪些文件格式轉換為PDF？

IronPDF 可以將各種文件格式轉換為 PDF，包括 HTML、圖像和其他文件類型，確保靈活性和與不同資料來源的兼容性。

IronPDF如何處理PDF內容擷取？

IronPDF 透過提供 API 來提取 PDF 內容、圖像和元數據，從而可以輕鬆地從 PDF 文件中檢索和操作數據。

IronPDF 能否用於自動化 PDF 文件工作流程？

是的，IronPDF 可用於自動化 PDF 文件工作流程，簡化 Web 應用程式中 PDF 文件的大量生成、轉換和分發等流程。

IronPDF 為開發者提供哪些支援？

IronPDF 為開發人員提供廣泛的支持，包括詳細的文件、範例程式碼和響應迅速的客戶服務，以協助整合和故障排除。

IronPDF 立即支援 .NET 10？

IronPDF 為 .NET 10 提供預發布支持，並且已經符合預計於 2025 年 11 月發布的 .NET 10 版本。開發人員可以在 .NET 10 專案中使用 IronPDF，無需任何特殊配置。

Curtis Chau
Curtis Chau
  立即與工程團隊聊天
技術作家

Curtis Chau 擁有卡爾頓大學計算機科學學士學位，專注於前端開發，擅長於 Node.js、TypeScript、JavaScript 和 React。Curtis 熱衷於創建直觀且美觀的用戶界面，喜歡使用現代框架並打造結構良好、視覺吸引人的手冊。

除了開發之外，Curtis 對物聯網 (IoT) 有著濃厚的興趣，探索將硬體和軟體結合的創新方式。在閒暇時間，他喜愛遊戲並構建 Discord 機器人，結合科技與創意的樂趣。

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