如何使用IronPDF創建.NET PDF API

先決條件

• .NET 6.0 SDK 或更新版本
• Visual Studio 2022 或 Visual Studio Code
• Postman 或類似的 API 測試工具來測試您的 PDF REST API

創建項目

首先，讓我們創建項目，並在其中構建我們的 PDF 生成工具。

dotnet new webapi -n PdfApiService
cd PdfApiService

安裝 IronPDF

下一步是通過 NuGet 將 IronPDF 添加到您的項目中：

dotnet add package IronPdf

或者，在 Visual Studio 中使用 NuGet 套件管理器控制台：

Install-Package IronPdf

項目結構

C# 開發的一個重要方面是保持清晰且結構良好的項目文件夾。 例如：

創建 PDF 服務

首先，我們將以下內容添加到 IPdfService.cs 文件中：

public interface IPdfService
{
    byte[] GeneratePdfFromHtml(string htmlContent);
    byte[] GeneratePdfFromUrl(string url);
}

public interface IPdfService
{
    byte[] GeneratePdfFromHtml(string htmlContent);
    byte[] GeneratePdfFromUrl(string url);
}

IRON VB CONVERTER ERROR developers@ironsoftware.com

在 PdfService.cs 文件中，我們將添加以下內容：

using IronPdf;
public class PdfService : IPdfService
{
    private readonly ChromePdfRenderer _renderer;
    public PdfService()
    {
        _renderer = new ChromePdfRenderer();
        // Configure rendering options for optimal PDF generation in .NET
        _renderer.RenderingOptions.MarginTop = 20;
        _renderer.RenderingOptions.MarginBottom = 20;
        _renderer.RenderingOptions.PrintHtmlBackgrounds = true;
    }
    public byte[] GeneratePdfFromHtml(string htmlContent)
    {
        // Generate PDF from HTML using the .NET PDF API
        var pdf = _renderer.RenderHtmlAsPdf(htmlContent);
        return pdf.BinaryData;
    }
    public byte[] GeneratePdfFromUrl(string url)
    {
        // Convert URL to PDF in the REST API
        var pdf = _renderer.RenderUrlAsPdf(url);
        return pdf.BinaryData;
    }
}

using IronPdf;
public class PdfService : IPdfService
{
    private readonly ChromePdfRenderer _renderer;
    public PdfService()
    {
        _renderer = new ChromePdfRenderer();
        // Configure rendering options for optimal PDF generation in .NET
        _renderer.RenderingOptions.MarginTop = 20;
        _renderer.RenderingOptions.MarginBottom = 20;
        _renderer.RenderingOptions.PrintHtmlBackgrounds = true;
    }
    public byte[] GeneratePdfFromHtml(string htmlContent)
    {
        // Generate PDF from HTML using the .NET PDF API
        var pdf = _renderer.RenderHtmlAsPdf(htmlContent);
        return pdf.BinaryData;
    }
    public byte[] GeneratePdfFromUrl(string url)
    {
        // Convert URL to PDF in the REST API
        var pdf = _renderer.RenderUrlAsPdf(url);
        return pdf.BinaryData;
    }
}

IRON VB CONVERTER ERROR developers@ironsoftware.com

PdfService 負責將 HTML 轉換為 PDF 的核心過程。 利用 IronPDF 的 ChromePdfRenderer，此類設置了合理的默認值，例如頁邊距和背景渲染以產生優雅的最終文檔。

當控制器傳入原始 HTML 時，該服務使用 IronPDF 將其渲染為專業質量的 PDF，並將結果返回為字節數據，準備好下載。 此外，它還可以通過直接將 URL 轉換為 PDF 來處理整個網頁。

創建控制器

現在是時候為我們的 API 創建控制器了。 這將提供一個 API 端點，能夠從 HTML 生成 PDF 文件。 然後它能夠將 PDF 文檔下載並保存到您的系統中以供進一步使用或共享。

// Controllers/PdfController.cs
using Microsoft.AspNetCore.Mvc;
[ApiController]
[Route("api/[controller]")]
public class PdfController : ControllerBase
{
    private readonly IPdfService _pdfService;
    public PdfController(IPdfService pdfService)
    {
        _pdfService = pdfService;
    }
    [HttpPost("html-to-pdf")]
    public IActionResult ConvertHtmlToPdf([FromBody] HtmlRequest request)
    {
        try
        {
            var pdfBytes = _pdfService.GeneratePdfFromHtml(request.HtmlContent);
            // Return as downloadable file
            return File(pdfBytes, "application/pdf", "document.pdf");
        }
        catch (Exception ex)
        {
            return BadRequest($"Error generating PDF: {ex.Message}");
        }
    }
}

// Controllers/PdfController.cs
using Microsoft.AspNetCore.Mvc;
[ApiController]
[Route("api/[controller]")]
public class PdfController : ControllerBase
{
    private readonly IPdfService _pdfService;
    public PdfController(IPdfService pdfService)
    {
        _pdfService = pdfService;
    }
    [HttpPost("html-to-pdf")]
    public IActionResult ConvertHtmlToPdf([FromBody] HtmlRequest request)
    {
        try
        {
            var pdfBytes = _pdfService.GeneratePdfFromHtml(request.HtmlContent);
            // Return as downloadable file
            return File(pdfBytes, "application/pdf", "document.pdf");
        }
        catch (Exception ex)
        {
            return BadRequest($"Error generating PDF: {ex.Message}");
        }
    }
}

IRON VB CONVERTER ERROR developers@ironsoftware.com

然後，在 HtmlRequest.cs 文件中，我們將添加這個：

// Models/HtmlRequest.cs
public class HtmlRequest
{
    public string HtmlContent { get; set; }
    public string FileName { get; set; } = "document.pdf";
}

// Models/HtmlRequest.cs
public class HtmlRequest
{
    public string HtmlContent { get; set; }
    public string FileName { get; set; } = "document.pdf";
}

IRON VB CONVERTER ERROR developers@ironsoftware.com

在第一個文件中，我們設置了一個簡單的 API 端點，將 HTML 轉換為可下載的 PDF。 當有人向 api/pdf/html-to-pdf 路徑發送簡單的 POST 請求時，PdfController 將處理將其轉換為 PDF 的工作分配給專用服務。

創建 PDF 後，控制器將其作為準備下載的文件返回給用戶。請求本身是使用 HtmlRequest 模型構建的，它攜帶原始 HTML 和最終文檔的可選文件名。 簡而言之，此設置使客戶端能夠輕鬆發送 HTML 並立即收到優雅的 PDF 回應。

註冊服務

更新您的 Program.cs 以註冊 PDF 服務：

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
// Register PDF service
builder.Services.AddSingleton<IPdfService, PdfService>();
var app = builder.Build();
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}
app.UseHttpsRedirection();
app.MapControllers();
app.Run();

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
// Register PDF service
builder.Services.AddSingleton<IPdfService, PdfService>();
var app = builder.Build();
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}
app.UseHttpsRedirection();
app.MapControllers();
app.Run();

IRON VB CONVERTER ERROR developers@ironsoftware.com

URL 轉 PDF 轉換

[HttpPost("url-to-pdf")]
public async Task<IActionResult> ConvertUrlToPdf([FromBody] UrlRequest request)
{
    try
    {
        var pdfBytes = await Task.Run(() => 
            _pdfService.GeneratePdfFromUrl(request.Url));
        return File(pdfBytes, "application/pdf", 
            $"{request.FileName ?? "website"}.pdf");
    }
    catch (Exception ex)
    {
        return BadRequest($"Failed to convert URL: {ex.Message}");
    }
}
public class UrlRequest
{
    public string Url { get; set; }
    public string FileName { get; set; }
}

[HttpPost("url-to-pdf")]
public async Task<IActionResult> ConvertUrlToPdf([FromBody] UrlRequest request)
{
    try
    {
        var pdfBytes = await Task.Run(() => 
            _pdfService.GeneratePdfFromUrl(request.Url));
        return File(pdfBytes, "application/pdf", 
            $"{request.FileName ?? "website"}.pdf");
    }
    catch (Exception ex)
    {
        return BadRequest($"Failed to convert URL: {ex.Message}");
    }
}
public class UrlRequest
{
    public string Url { get; set; }
    public string FileName { get; set; }
}

IRON VB CONVERTER ERROR developers@ironsoftware.com

添加自定義水印

public byte[] AddWatermarkFromFile(string filePath, string watermarkText)
{
    // Load PDF directly from file
    var pdf = PdfDocument.FromFile(filePath);
    pdf.ApplyWatermark(
        $"<h1 style='color:red;font-size:72px;'>{watermarkText}</h1>",
        75,
        IronPdf.Editing.VerticalAlignment.Middle,
        IronPdf.Editing.HorizontalAlignment.Center
    );
    return pdf.BinaryData;
}

public byte[] AddWatermarkFromFile(string filePath, string watermarkText)
{
    // Load PDF directly from file
    var pdf = PdfDocument.FromFile(filePath);
    pdf.ApplyWatermark(
        $"<h1 style='color:red;font-size:72px;'>{watermarkText}</h1>",
        75,
        IronPdf.Editing.VerticalAlignment.Middle,
        IronPdf.Editing.HorizontalAlignment.Center
    );
    return pdf.BinaryData;
}

IRON VB CONVERTER ERROR developers@ironsoftware.com

異步操作

在構建涉及 I/O 操作的項目時，明智的做法是使用異步編碼。 如果您的 PDF 內容來自外部資源，如：

• 下載 HTML 頁面（RenderUrlAsPdf）
• 通過 HTTP 獲取圖像、CSS 或字體
• 讀取/寫入磁盤或雲存儲中的文件

這些操作然後可以阻止一個線程，但使用異步防止您的 API 線程閒置等待。

示例：

public async Task<byte[]> GeneratePdfFromHtmlAsync(string htmlContent)
{
    return await Task.Run(() => 
    {
        var pdf = _renderer.RenderHtmlAsPdf(htmlContent);
        return pdf.BinaryData;
    });
}

public async Task<byte[]> GeneratePdfFromHtmlAsync(string htmlContent)
{
    return await Task.Run(() => 
    {
        var pdf = _renderer.RenderHtmlAsPdf(htmlContent);
        return pdf.BinaryData;
    });
}

IRON VB CONVERTER ERROR developers@ironsoftware.com

渲染選項

配置 IronPDF 以實現最佳性能：

_renderer.RenderingOptions.EnableJavaScript = false; // If JS not needed
_renderer.RenderingOptions.CssMediaType = PdfCssMediaType.Print;
_renderer.RenderingOptions.RenderDelay = 0; // Remove if no JS
_renderer.RenderingOptions.Timeout = 30; // Set reasonable timeout

_renderer.RenderingOptions.EnableJavaScript = false; // If JS not needed
_renderer.RenderingOptions.CssMediaType = PdfCssMediaType.Print;
_renderer.RenderingOptions.RenderDelay = 0; // Remove if no JS
_renderer.RenderingOptions.Timeout = 30; // Set reasonable timeout

IRON VB CONVERTER ERROR developers@ironsoftware.com

讓我們構建一個實用的發票生成端點，展示完整的實施。 此示例顯示了一個生產 .NET PDF API 如何生成具有動態數據的專業發票。

立即開始使用 IronPDF。

免費啟動

首先，我們將在 Models 文件夾中創建一個新文件。 在這裡，我將其命名為 Invoice.cs。 然後將以下代碼添加到新文件中。

public class Invoice
{
    public string InvoiceNumber { get; set; }
    public DateTime Date { get; set; }
    public string CustomerName { get; set; }
    public string CustomerAddress { get; set; }
    public List<InvoiceItem> Items { get; set; }
    public decimal Tax { 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;
}

public class Invoice
{
    public string InvoiceNumber { get; set; }
    public DateTime Date { get; set; }
    public string CustomerName { get; set; }
    public string CustomerAddress { get; set; }
    public List<InvoiceItem> Items { get; set; }
    public decimal Tax { 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

然後，我們需要為發票生成器創建一個新的服務文件。 在您的 Services 文件夾中添加以下代碼。 對於我來說，我創建了一個名為 InvoiceService.cs 的新文件。 此代碼將處理我們的發票 PDF 文件的樣式和佈局。

public class InvoiceService
{
    private readonly ChromePdfRenderer _renderer;
    public InvoiceService()
    {
        _renderer = new ChromePdfRenderer();
        _renderer.RenderingOptions.MarginTop = 10;
        _renderer.RenderingOptions.MarginBottom = 10;
        _renderer.RenderingOptions.PrintHtmlBackgrounds = true;
    }
    public byte[] GenerateInvoice(Invoice invoice)
{
    var html = BuildInvoiceHtml(invoice);
    // Add footer with page numbers
    _renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
    {
        MaxHeight = 15,
        HtmlFragment = "<center><i>{page} of {total-pages}</i></center>",
        DrawDividerLine = true
    };
    var pdf = _renderer.RenderHtmlAsPdf(html);
    return pdf.BinaryData;
}
    private string BuildInvoiceHtml(Invoice invoice)
    {
        var subtotal = invoice.Items.Sum(i => i.Total);
        var taxAmount = subtotal * (invoice.Tax / 100);
        var total = subtotal + taxAmount;
        var itemsHtml = string.Join("", invoice.Items.Select(item => 
            $@"<tr>
                <td>{item.Description}</td>
                <td class='text-center'>{item.Quantity}</td>
                <td class='text-right'>${item.UnitPrice:F2}</td>
                <td class='text-right'>${item.Total:F2}</td>
            </tr>"));
        return $@"
        <!DOCTYPE html>
        <html>
        <head>
            <style>
                body {{ font-family: Arial, sans-serif; }}
                .invoice-header {{ 
                    background-color: #f8f9fa; 
                    padding: 20px; 
                    margin-bottom: 20px; 
                }}
                table {{ 
                    width: 100%; 
                    border-collapse: collapse; 
                }}
                th, td {{ 
                    padding: 10px; 
                    border-bottom: 1px solid #ddd; 
                }}
                th {{ 
                    background-color: #007bff; 
                    color: white; 
                }}
                .text-right {{ text-align: right; }}
                .text-center {{ text-align: center; }}
                .total-section {{ 
                    margin-top: 20px; 
                    text-align: right; 
                }}
            </style>
        </head>
        <body>
            <div class='invoice-header'>
                <h1>Invoice #{invoice.InvoiceNumber}</h1>
                <p>Date: {invoice.Date:yyyy-MM-dd}</p>
            </div>   
            <div>
                <h3>Bill To:</h3>
                <p>{invoice.CustomerName}<br/>{invoice.CustomerAddress}</p>
            </div>    
            <table>
                <thead>
                    <tr>
                        <th>Description</th>
                        <th>Quantity</th>
                        <th>Unit Price</th>
                        <th>Total</th>
                    </tr>
                </thead>
                <tbody>
                    {itemsHtml}
                </tbody>
            </table>
            <div class='total-section'>
                <p>Subtotal: ${subtotal:F2}</p>
                <p>Tax ({invoice.Tax}%): ${taxAmount:F2}</p>
                <h3>Total: ${total:F2}</h3>
            </div>
        </body>
        </html>";
    }
}

public class InvoiceService
{
    private readonly ChromePdfRenderer _renderer;
    public InvoiceService()
    {
        _renderer = new ChromePdfRenderer();
        _renderer.RenderingOptions.MarginTop = 10;
        _renderer.RenderingOptions.MarginBottom = 10;
        _renderer.RenderingOptions.PrintHtmlBackgrounds = true;
    }
    public byte[] GenerateInvoice(Invoice invoice)
{
    var html = BuildInvoiceHtml(invoice);
    // Add footer with page numbers
    _renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
    {
        MaxHeight = 15,
        HtmlFragment = "<center><i>{page} of {total-pages}</i></center>",
        DrawDividerLine = true
    };
    var pdf = _renderer.RenderHtmlAsPdf(html);
    return pdf.BinaryData;
}
    private string BuildInvoiceHtml(Invoice invoice)
    {
        var subtotal = invoice.Items.Sum(i => i.Total);
        var taxAmount = subtotal * (invoice.Tax / 100);
        var total = subtotal + taxAmount;
        var itemsHtml = string.Join("", invoice.Items.Select(item => 
            $@"<tr>
                <td>{item.Description}</td>
                <td class='text-center'>{item.Quantity}</td>
                <td class='text-right'>${item.UnitPrice:F2}</td>
                <td class='text-right'>${item.Total:F2}</td>
            </tr>"));
        return $@"
        <!DOCTYPE html>
        <html>
        <head>
            <style>
                body {{ font-family: Arial, sans-serif; }}
                .invoice-header {{ 
                    background-color: #f8f9fa; 
                    padding: 20px; 
                    margin-bottom: 20px; 
                }}
                table {{ 
                    width: 100%; 
                    border-collapse: collapse; 
                }}
                th, td {{ 
                    padding: 10px; 
                    border-bottom: 1px solid #ddd; 
                }}
                th {{ 
                    background-color: #007bff; 
                    color: white; 
                }}
                .text-right {{ text-align: right; }}
                .text-center {{ text-align: center; }}
                .total-section {{ 
                    margin-top: 20px; 
                    text-align: right; 
                }}
            </style>
        </head>
        <body>
            <div class='invoice-header'>
                <h1>Invoice #{invoice.InvoiceNumber}</h1>
                <p>Date: {invoice.Date:yyyy-MM-dd}</p>
            </div>   
            <div>
                <h3>Bill To:</h3>
                <p>{invoice.CustomerName}<br/>{invoice.CustomerAddress}</p>
            </div>    
            <table>
                <thead>
                    <tr>
                        <th>Description</th>
                        <th>Quantity</th>
                        <th>Unit Price</th>
                        <th>Total</th>
                    </tr>
                </thead>
                <tbody>
                    {itemsHtml}
                </tbody>
            </table>
            <div class='total-section'>
                <p>Subtotal: ${subtotal:F2}</p>
                <p>Tax ({invoice.Tax}%): ${taxAmount:F2}</p>
                <h3>Total: ${total:F2}</h3>
            </div>
        </body>
        </html>";
    }
}

IRON VB CONVERTER ERROR developers@ironsoftware.com

最後，您需要創建一個新的控制器，以便通過 API 訪問和創建新的發票。

[ApiController]
[Route("api/[controller]")]
public class InvoiceController : ControllerBase
{
    private readonly InvoiceService _invoiceService;
    public InvoiceController(InvoiceService invoiceService)
    {
        _invoiceService = invoiceService;
    }
    [HttpPost("generate")]
    public IActionResult GenerateInvoice([FromBody] Invoice invoice)
    {
        try
        {
            var pdfBytes = _invoiceService.GenerateInvoice(invoice);
            var fileName = $"Invoice_{invoice.InvoiceNumber}.pdf";
            return File(pdfBytes, "application/pdf", fileName);
        }
        catch (Exception ex)
        {
            return StatusCode(500, $"Error generating invoice: {ex.Message}");
        }
    }
}

[ApiController]
[Route("api/[controller]")]
public class InvoiceController : ControllerBase
{
    private readonly InvoiceService _invoiceService;
    public InvoiceController(InvoiceService invoiceService)
    {
        _invoiceService = invoiceService;
    }
    [HttpPost("generate")]
    public IActionResult GenerateInvoice([FromBody] Invoice invoice)
    {
        try
        {
            var pdfBytes = _invoiceService.GenerateInvoice(invoice);
            var fileName = $"Invoice_{invoice.InvoiceNumber}.pdf";
            return File(pdfBytes, "application/pdf", fileName);
        }
        catch (Exception ex)
        {
            return StatusCode(500, $"Error generating invoice: {ex.Message}");
        }
    }
}

IRON VB CONVERTER ERROR developers@ironsoftware.com

發票輸出

基本 Dockerfile

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 80
FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["PdfApiService.csproj", "."]
RUN dotnet restore
COPY . .
RUN dotnet build -c Release -o /app/build
FROM build AS publish
RUN dotnet publish -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
# IronPDF requires additional dependencies on Linux
RUN apt-get update && apt-get install -y \
    libgdiplus \
    libc6-dev \
    libx11-dev \
    && rm -rf /var/lib/apt/lists/*     
ENTRYPOINT ["dotnet", "PdfApiService.dll"]

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 80
FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["PdfApiService.csproj", "."]
RUN dotnet restore
COPY . .
RUN dotnet build -c Release -o /app/build
FROM build AS publish
RUN dotnet publish -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
# IronPDF requires additional dependencies on Linux
RUN apt-get update && apt-get install -y \
    libgdiplus \
    libc6-dev \
    libx11-dev \
    && rm -rf /var/lib/apt/lists/*     
ENTRYPOINT ["dotnet", "PdfApiService.dll"]

IRON VB CONVERTER ERROR developers@ironsoftware.com

欲了解您的 .NET PDF API 的詳細部署指南，請參考：

• IronPDF Docker 文檔 - 完整的容器化指南
• IronPDF Azure 部署 - Azure 函數和應用服務
• IronPDF AWS 部署 - Lambda 和 EC2 部署
• IronPDF Linux 設置 - Linux 特定配置

後續步驟

準備好在您的生產 .NET PDF API 中實施 IronPDF 了嗎？ 以下是您的下一步操作：

1. 開始免費試用 - 在您的開發環境中測試 IronPDF 的完整功能
2. Explore advanced features - Check out digital signatures, PDF forms, and other advanced PDF features
3. 自信地擴展 - 查看生產 API 需求的 許可選項

今天就建立您的 .NET PDF API，並通過 IronPDF 在整個應用程序生態系統中簡化文檔生成！