IronPDF vs Aspose.PDF vs Syncfusion：我应该选择哪个ASP.NET PDF库？

using Aspose.Pdf;
using Aspose.Pdf.Text;

// Create new instance of Document class
var document = new Aspose.Pdf.Document();

// Add pages to the document object
var page = document.Pages.Add();

// Create new TextFragment with Hello World text
var textFragment = new TextFragment("Hello World!");
textFragment.TextState.FontSize = 24;
textFragment.TextState.Font = FontRepository.FindFont("Arial");

// Add text to paragraphs collection
page.Paragraphs.Add(textFragment);

// Save the generated PDF document
document.Save("output.pdf");

Imports Aspose.Pdf
Imports Aspose.Pdf.Text

' Create new instance of Document class
Dim document As New Aspose.Pdf.Document()

' Add pages to the document object
Dim page = document.Pages.Add()

' Create new TextFragment with Hello World text
Dim textFragment As New TextFragment("Hello World!")
textFragment.TextState.FontSize = 24
textFragment.TextState.Font = FontRepository.FindFont("Arial")

' Add text to paragraphs collection
page.Paragraphs.Add(textFragment)

' Save the generated PDF document
document.Save("output.pdf")

using Aspose.Pdf;
using Aspose.Pdf.Text;

// Create new Document instance
var document = new Document();
var page = document.Pages.Add();

// Set page margins
page.PageInfo.Margin = new MarginInfo(72, 72, 72, 72);

// Add title text
var title = new TextFragment("INVOICE");
title.TextState.FontSize = 28;
title.TextState.Font = FontRepository.FindFont("Arial Bold");
title.HorizontalAlignment = HorizontalAlignment.Center;

// Add to paragraphs
page.Paragraphs.Add(title);

// Add space
page.Paragraphs.Add(new TextFragment("\n"));

// Create table object for invoice items
var table = new Table();
table.ColumnWidths = "200 100 100";
table.Border = new BorderInfo(BorderSide.All, 0.5f, Color.Black);
table.DefaultCellBorder = new BorderInfo(BorderSide.All, 0.5f, Color.Black);
table.DefaultCellPadding = new MarginInfo(5, 5, 5, 5);

// Add header row to table
var headerRow = table.Rows.Add();
headerRow.Cells.Add("Description");
headerRow.Cells.Add("Quantity"); 
headerRow.Cells.Add("Price");

// Style header cells
foreach (Cell headerCell in headerRow.Cells)
{
    headerCell.BackgroundColor = Color.Gray;
    var headerText = (TextFragment)headerCell.Paragraphs[0];
    headerText.TextState.ForegroundColor = Color.White;
    headerText.TextState.Font = FontRepository.FindFont("Arial Bold");
}

// Add data rows
var dataRow = table.Rows.Add();
dataRow.Cells.Add("Product A");
dataRow.Cells.Add("2");
dataRow.Cells.Add("$50.00");

// Add table to page paragraphs
page.Paragraphs.Add(table);

// Save the PDF document
document.Save("invoice.pdf");

Imports Aspose.Pdf
Imports Aspose.Pdf.Text

' Create new Document instance
Dim document As New Document()
Dim page As Page = document.Pages.Add()

' Set page margins
page.PageInfo.Margin = New MarginInfo(72, 72, 72, 72)

' Add title text
Dim title As New TextFragment("INVOICE")
title.TextState.FontSize = 28
title.TextState.Font = FontRepository.FindFont("Arial Bold")
title.HorizontalAlignment = HorizontalAlignment.Center

' Add to paragraphs
page.Paragraphs.Add(title)

' Add space
page.Paragraphs.Add(New TextFragment(vbCrLf))

' Create table object for invoice items
Dim table As New Table()
table.ColumnWidths = "200 100 100"
table.Border = New BorderInfo(BorderSide.All, 0.5F, Color.Black)
table.DefaultCellBorder = New BorderInfo(BorderSide.All, 0.5F, Color.Black)
table.DefaultCellPadding = New MarginInfo(5, 5, 5, 5)

' Add header row to table
Dim headerRow As Row = table.Rows.Add()
headerRow.Cells.Add("Description")
headerRow.Cells.Add("Quantity")
headerRow.Cells.Add("Price")

' Style header cells
For Each headerCell As Cell In headerRow.Cells
    headerCell.BackgroundColor = Color.Gray
    Dim headerText As TextFragment = CType(headerCell.Paragraphs(0), TextFragment)
    headerText.TextState.ForegroundColor = Color.White
    headerText.TextState.Font = FontRepository.FindFont("Arial Bold")
Next

' Add data rows
Dim dataRow As Row = table.Rows.Add()
dataRow.Cells.Add("Product A")
dataRow.Cells.Add("2")
dataRow.Cells.Add("$50.00")

' Add table to page paragraphs
page.Paragraphs.Add(table)

' Save the PDF document
document.Save("invoice.pdf")

using IronPdf;

var renderer = new ChromePdfRenderer();

// Configure PDF output settings
renderer.RenderingOptions.MarginTop = 25;
renderer.RenderingOptions.MarginBottom = 25;
renderer.RenderingOptions.MarginLeft = 25;
renderer.RenderingOptions.MarginRight = 25;
renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Portrait;

// Enable JavaScript for dynamic calculations
renderer.RenderingOptions.EnableJavaScript = true;
renderer.RenderingOptions.RenderDelay = 500; // Wait for JS execution

// HTML string with invoice content
var html = @"
<html>
<head>
    <style>
        body { font-family: Arial, sans-serif; }
        h1 { color: #333; text-align: center; }
        table { width: 100%; border-collapse: collapse; }
        th, td { padding: 12px; text-align: left; border-bottom: 1px solid #ddd; }
        th { background-color: #4CAF50; color: white; }
        tr:hover { background-color: #f5f5f5; }
        .total { font-weight: bold; font-size: 18px; }
    </style>
</head>
<body>
    <h1>INVOICE</h1>
    <p>Invoice Date: <span id='date'></span></p>

    <table>
        <tr>
            <th>Description</th>
            <th>Quantity</th>
            <th>Unit Price</th>
            <th>Total</th>
        </tr>
        <tr>
            <td>Product A</td>
            <td>2</td>
            <td>$25.00</td>
            <td>$50.00</td>
        </tr>
        <tr>
            <td>Product B</td>
            <td>3</td>
            <td>$15.00</td>
            <td>$45.00</td>
        </tr>
        <tr>
            <td colspan='3' class='total'>Total:</td>
            <td class='total'>$95.00</td>
        </tr>
    </table>

    <script>
        document.getElementById('date').innerText = new Date().toLocaleDateString();
    </script>
</body>
</html>";

// Generate PDF from HTML
var pdf = renderer.RenderHtmlAsPdf(html);

// Add metadata
pdf.MetaData.Author = "Your Company";
pdf.MetaData.Title = "Invoice";

pdf.SaveAs("invoice.pdf");

Imports IronPdf

Dim renderer As New ChromePdfRenderer()

' Configure PDF output settings
renderer.RenderingOptions.MarginTop = 25
renderer.RenderingOptions.MarginBottom = 25
renderer.RenderingOptions.MarginLeft = 25
renderer.RenderingOptions.MarginRight = 25
renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Portrait

' Enable JavaScript for dynamic calculations
renderer.RenderingOptions.EnableJavaScript = True
renderer.RenderingOptions.RenderDelay = 500 ' Wait for JS execution

' HTML string with invoice content
Dim html As String = "
<html>
<head>
    <style>
        body { font-family: Arial, sans-serif; }
        h1 { color: #333; text-align: center; }
        table { width: 100%; border-collapse: collapse; }
        th, td { padding: 12px; text-align: left; border-bottom: 1px solid #ddd; }
        th { background-color: #4CAF50; color: white; }
        tr:hover { background-color: #f5f5f5; }
        .total { font-weight: bold; font-size: 18px; }
    </style>
</head>
<body>
    <h1>INVOICE</h1>
    <p>Invoice Date: <span id='date'></span></p>

    <table>
        <tr>
            <th>Description</th>
            <th>Quantity</th>
            <th>Unit Price</th>
            <th>Total</th>
        </tr>
        <tr>
            <td>Product A</td>
            <td>2</td>
            <td>$25.00</td>
            <td>$50.00</td>
        </tr>
        <tr>
            <td>Product B</td>
            <td>3</td>
            <td>$15.00</td>
            <td>$45.00</td>
        </tr>
        <tr>
            <td colspan='3' class='total'>Total:</td>
            <td class='total'>$95.00</td>
        </tr>
    </table>

    <script>
        document.getElementById('date').innerText = new Date().toLocaleDateString();
    </script>
</body>
</html>"

' Generate PDF from HTML
Dim pdf = renderer.RenderHtmlAsPdf(html)

' Add metadata
pdf.MetaData.Author = "Your Company"
pdf.MetaData.Title = "Invoice"

pdf.SaveAs("invoice.pdf")

//IronPDF- Convert any URL to PDF
var renderer = new ChromePdfRenderer();

// Configure for improved web page capture
renderer.RenderingOptions.ViewPortWidth = 1920;
renderer.RenderingOptions.ViewPortHeight = 1080;
renderer.RenderingOptions.PrintHtmlBackgrounds = true;
renderer.RenderingOptions.WaitFor.RenderDelay(2000); // Wait for dynamic content

// Load and convert URL to PDF
var pdf = renderer.RenderUrlAsPdf("___PROTECTED_URL_124___");

// Apply post-processing
pdf.CompressImages(90); // Optimize file size
pdf.SaveAs("website.pdf");

Imports IronPdf

' IronPDF - Convert any URL to PDF
Dim renderer As New ChromePdfRenderer()

' Configure for improved web page capture
renderer.RenderingOptions.ViewPortWidth = 1920
renderer.RenderingOptions.ViewPortHeight = 1080
renderer.RenderingOptions.PrintHtmlBackgrounds = True
renderer.RenderingOptions.WaitFor.RenderDelay(2000) ' Wait for dynamic content

' Load and convert URL to PDF
Dim pdf = renderer.RenderUrlAsPdf("___PROTECTED_URL_124___")

' Apply post-processing
pdf.CompressImages(90) ' Optimize file size
pdf.SaveAs("website.pdf")

// Create PDF document
var pdf = renderer.RenderHtmlAsPdf(html);

// Implement complete security settings
pdf.SecuritySettings.UserPassword = "user123";
pdf.SecuritySettings.OwnerPassword = "owner456";

// Configure permissions
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
pdf.SecuritySettings.AllowUserEditing = IronPdf.Security.PdfEditSecurity.NoEdit;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;
pdf.SecuritySettings.AllowUserFormData = true;

// Add digital signature
pdf.SignWithFile("/path/to/certificate.pfx", "password");

// Save secured file
pdf.SaveAs("secured.pdf");

' Create PDF document
Dim pdf = renderer.RenderHtmlAsPdf(html)

' Implement complete security settings
pdf.SecuritySettings.UserPassword = "user123"
pdf.SecuritySettings.OwnerPassword = "owner456"

' Configure permissions
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights
pdf.SecuritySettings.AllowUserEditing = IronPdf.Security.PdfEditSecurity.NoEdit
pdf.SecuritySettings.AllowUserCopyPasteContent = False
pdf.SecuritySettings.AllowUserFormData = True

' Add digital signature
pdf.SignWithFile("/path/to/certificate.pfx", "password")

' Save secured file
pdf.SaveAs("secured.pdf")

// Aspose PDF - Creating forms requires manual positioning
var document = new Document();
var page = document.Pages.Add();

// Create text field
var textField = new TextBoxField(page, new Rectangle(100, 700, 200, 720));
textField.PartialName = "name";
textField.Value = "Enter your name";
document.Form.Add(textField);

//IronPDF- Use HTML forms naturally
var html = @"
<form>
    <label>Name: <input type='text' name='name' required></label>
    <label>Email: <input type='email' name='email' required></label>
    <input type='submit' value='Submit'>
</form>";

var pdf = renderer.RenderHtmlAsPdf(html);
// Forms are automatically interactive in the PDF

Imports Aspose.Pdf
Imports IronPdf

' Aspose PDF - Creating forms requires manual positioning
Dim document As New Document()
Dim page As Page = document.Pages.Add()

' Create text field
Dim textField As New TextBoxField(page, New Rectangle(100, 700, 200, 720))
textField.PartialName = "name"
textField.Value = "Enter your name"
document.Form.Add(textField)

' IronPDF- Use HTML forms naturally
Dim html As String = "
<form>
    <label>Name: <input type='text' name='name' required></label>
    <label>Email: <input type='email' name='email' required></label>
    <input type='submit' value='Submit'>
</form>"

Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(html)
' Forms are automatically interactive in the PDF

// Load existing PDF
var pdf = PdfDocument.FromFile("existing.pdf");

// Add pages from another PDF
var anotherPdf = PdfDocument.FromFile("append.pdf");
pdf.AppendPdf(anotherPdf);

IronPDF offers straightforward [licensing](licensing) starting at $999, including support and updates. The free trial includes all features without watermarks.

// Add watermark
pdf.ApplyWatermark(@"
    <div style='opacity: 0.5; font-size: 48px; color: red; transform: rotate(-45deg);'>
        CONFIDENTIAL
    </div>", 30, VerticalAlignment.Middle, HorizontalAlignment.Center);

// Compress for web
pdf.CompressImages(70);
pdf.SaveAs("optimized.pdf");

' Load existing PDF
Dim pdf = PdfDocument.FromFile("existing.pdf")

' Add pages from another PDF
Dim anotherPdf = PdfDocument.FromFile("append.pdf")
pdf.AppendPdf(anotherPdf)

' Add watermark
pdf.ApplyWatermark("
    <div style='opacity: 0.5; font-size: 48px; color: red; transform: rotate(-45deg);'>
        CONFIDENTIAL
    </div>", 30, VerticalAlignment.Middle, HorizontalAlignment.Center)

' Compress for web
pdf.CompressImages(70)
pdf.SaveAs("optimized.pdf")