如何在 C# 中從 PDFSharp 轉移到 IronPDF

# Remove PDFSharp
dotnet remove package PdfSharp
dotnet remove package PdfSharp-wpf
dotnet remove package PdfSharp.Charting

# Add IronPDF
dotnet add package IronPdf

// Add at application startup (Program.cs or Startup.cs)
IronPdf.License.LicenseKey = "YOUR-LICENSE-KEY";

' Add at application startup (Program.vb or Startup.vb)
IronPdf.License.LicenseKey = "YOUR-LICENSE-KEY"

# Find allPDFSharpusages in your codebase
grep -r "PdfSharp\|XGraphics\|XFont\|XBrush\|XPen" --include="*.cs" .

// Before: PDFSharp
using PdfSharp.Pdf;
using PdfSharp.Drawing;
using PdfSharp.Pdf.IO;

// After: IronPDF
using IronPdf;
using IronPdf.Editing;

Imports IronPdf
Imports IronPdf.Editing

// NuGet: Install-Package PdfSharp
using PdfSharp.Pdf;
using PdfSharp.Drawing;
using System;

class Program
{
    static void Main()
    {
        //PDFSharpdoes not have built-inHTML 至 PDFconversion
        // You need to manually parse HTML and render content
        PdfDocument document = new PdfDocument();
        PdfPage page = document.AddPage();
        XGraphics gfx = XGraphics.FromPdfPage(page);
        XFont font = new XFont("Arial", 12);

        // 手動的 text rendering (no HTML support)
        gfx.DrawString("Hello from PDFSharp", font, XBrushes.Black,
            new XRect(0, 0, page.Width, page.Height),
            XStringFormats.TopLeft);

        document.Save("output.pdf");
    }
}

Imports PdfSharp.Pdf
Imports PdfSharp.Drawing
Imports System

Module Program
    Sub Main()
        ' PDFSharp does not have built-in HTML to PDF conversion
        ' You need to manually parse HTML and render content
        Dim document As New PdfDocument()
        Dim page As PdfPage = document.AddPage()
        Dim gfx As XGraphics = XGraphics.FromPdfPage(page)
        Dim font As New XFont("Arial", 12)

        ' Manual text rendering (no HTML support)
        gfx.DrawString("Hello from PDFSharp", font, XBrushes.Black, New XRect(0, 0, page.Width, page.Height), XStringFormats.TopLeft)

        document.Save("output.pdf")
    End Sub
End Module

// NuGet: Install-Package IronPdf
using IronPdf;
using System;

class Program
{
    static void Main()
    {
        //IronPDFhas nativeHTML 至 PDFrendering
        var renderer = new ChromePdfRenderer();

        string html = "<h1>Hello from IronPDF</h1><p>EasyHTML 至 PDFconversion</p>";
        var pdf = renderer.RenderHtmlAsPdf(html);

        pdf.SaveAs("output.pdf");
    }
}

Imports IronPdf
Imports System

Class Program
    Shared Sub Main()
        ' IronPDF has native HTML to PDF rendering
        Dim renderer As New ChromePdfRenderer()

        Dim html As String = "<h1>Hello from IronPDF</h1><p>Easy HTML to PDF conversion</p>"
        Dim pdf = renderer.RenderHtmlAsPdf(html)

        pdf.SaveAs("output.pdf")
    End Sub
End Class

// NuGet: Install-Package PdfSharp
using PdfSharp.Pdf;
using PdfSharp.Pdf.IO;
using PdfSharp.Drawing;
using System;

class Program
{
    static void Main()
    {
        // Open existing PDF
        PdfDocument document = PdfReader.Open("existing.pdf", PdfDocumentOpenMode.Modify);
        PdfPage page = document.Pages[0];

        // Get graphics object
        XGraphics gfx = XGraphics.FromPdfPage(page);
        XFont font = new XFont("Arial", 20, XFontStyle.Bold);

        // Draw text at specific position
        gfx.DrawString("Watermark Text", font, XBrushes.Red,
            new XPoint(200, 400));

        document.Save("modified.pdf");
    }
}

Imports PdfSharp.Pdf
Imports PdfSharp.Pdf.IO
Imports PdfSharp.Drawing
Imports System

Module Program
    Sub Main()
        ' Open existing PDF
        Dim document As PdfDocument = PdfReader.Open("existing.pdf", PdfDocumentOpenMode.Modify)
        Dim page As PdfPage = document.Pages(0)

        ' Get graphics object
        Dim gfx As XGraphics = XGraphics.FromPdfPage(page)
        Dim font As New XFont("Arial", 20, XFontStyle.Bold)

        ' Draw text at specific position
        gfx.DrawString("Watermark Text", font, XBrushes.Red, New XPoint(200, 400))

        document.Save("modified.pdf")
    End Sub
End Module

// NuGet: Install-Package IronPdf
using IronPdf;
using IronPdf.Editing;
using System;

class Program
{
    static void Main()
    {
        // Open existing PDF
        var pdf = PdfDocument.FromFile("existing.pdf");

        // Add text stamp/watermark
        var textStamper = new TextStamper()
        {
            Text = "Watermark Text",
            FontSize = 20,
            Color = IronSoftware.Drawing.Color.Red,
            VerticalAlignment = VerticalAlignment.Middle,
            HorizontalAlignment = HorizontalAlignment.Center
        };

        pdf.ApplyStamp(textStamper);
        pdf.SaveAs("modified.pdf");
    }
}

Imports IronPdf
Imports IronPdf.Editing
Imports System

Module Program
    Sub Main()
        ' Open existing PDF
        Dim pdf = PdfDocument.FromFile("existing.pdf")

        ' Add text stamp/watermark
        Dim textStamper = New TextStamper() With {
            .Text = "Watermark Text",
            .FontSize = 20,
            .Color = IronSoftware.Drawing.Color.Red,
            .VerticalAlignment = VerticalAlignment.Middle,
            .HorizontalAlignment = HorizontalAlignment.Center
        }

        pdf.ApplyStamp(textStamper)
        pdf.SaveAs("modified.pdf")
    End Sub
End Module

// NuGet: Install-Package PdfSharp
using PdfSharp.Pdf;
using PdfSharp.Drawing;
using System;

class Program
{
    static void Main()
    {
        // Create new PDF document
        PdfDocument document = new PdfDocument();
        PdfPage page = document.AddPage();
        XGraphics gfx = XGraphics.FromPdfPage(page);

        // Load and draw image
        XImage image = XImage.FromFile("image.jpg");

        // Calculate size to fit page
        double width = 200;
        double height = 200;

        gfx.DrawImage(image, 50, 50, width, height);

        // Add text
        XFont font = new XFont("Arial", 16);
        gfx.DrawString("Image in PDF", font, XBrushes.Black,
            new XPoint(50, 270));

        document.Save("output.pdf");
    }
}

Imports PdfSharp.Pdf
Imports PdfSharp.Drawing
Imports System

Module Program
    Sub Main()
        ' Create new PDF document
        Dim document As New PdfDocument()
        Dim page As PdfPage = document.AddPage()
        Dim gfx As XGraphics = XGraphics.FromPdfPage(page)

        ' Load and draw image
        Dim image As XImage = XImage.FromFile("image.jpg")

        ' Calculate size to fit page
        Dim width As Double = 200
        Dim height As Double = 200

        gfx.DrawImage(image, 50, 50, width, height)

        ' Add text
        Dim font As New XFont("Arial", 16)
        gfx.DrawString("Image in PDF", font, XBrushes.Black, New XPoint(50, 270))

        document.Save("output.pdf")
    End Sub
End Module

// NuGet: Install-Package IronPdf
using IronPdf;
using System;

class Program
{
    static void Main()
    {
        // Create PDF from HTML with image
        var renderer = new ChromePdfRenderer();

        string html = @"
            <h1>Image in PDF</h1>
            <img src='image.jpg' style='width:200px; height:200px;' />
            <p>Easy image embedding with HTML</p>";

        var pdf = renderer.RenderHtmlAsPdf(html);
        pdf.SaveAs("output.pdf");

        // Alternative: Add image to existing PDF
        var existingPdf = new ChromePdfRenderer().RenderHtmlAsPdf("<h1>Document</h1>");
        var imageStamper = new IronPdf.Editing.ImageStamper(new Uri("image.jpg"))
        {
            VerticalAlignment = IronPdf.Editing.VerticalAlignment.Top
        };
        existingPdf.ApplyStamp(imageStamper);
    }
}

Imports IronPdf
Imports System

Class Program
    Shared Sub Main()
        ' Create PDF from HTML with image
        Dim renderer = New ChromePdfRenderer()

        Dim html As String = "
            <h1>Image in PDF</h1>
            <img src='image.jpg' style='width:200px; height:200px;' />
            <p>Easy image embedding with HTML</p>"

        Dim pdf = renderer.RenderHtmlAsPdf(html)
        pdf.SaveAs("output.pdf")

        ' Alternative: Add image to existing PDF
        Dim existingPdf = New ChromePdfRenderer().RenderHtmlAsPdf("<h1>Document</h1>")
        Dim imageStamper = New IronPdf.Editing.ImageStamper(New Uri("image.jpg")) With {
            .VerticalAlignment = IronPdf.Editing.VerticalAlignment.Top
        }
        existingPdf.ApplyStamp(imageStamper)
    End Sub
End Class

// PDFSharp: 手動的 positioning nightmare
gfx.DrawString("Invoice", titleFont, XBrushes.Black, new XPoint(50, 50));
gfx.DrawString("Customer: John", bodyFont, XBrushes.Black, new XPoint(50, 80));

// IronPDF: Let CSS handle layout
var html = @"
<div style='padding: 50px;'>
    <h1>Invoice</h1>
    <p>Customer: John</p>
</div>";
var pdf = renderer.RenderHtmlAsPdf(html);

Imports PdfSharp.Drawing
Imports IronPdf

' PDFSharp: 手動的 positioning nightmare
gfx.DrawString("Invoice", titleFont, XBrushes.Black, New XPoint(50, 50))
gfx.DrawString("Customer: John", bodyFont, XBrushes.Black, New XPoint(50, 80))

' IronPDF: Let CSS handle layout
Dim html As String = "
<div style='padding: 50px;'>
    <h1>Invoice</h1>
    <p>Customer: John</p>
</div>"
Dim pdf = renderer.RenderHtmlAsPdf(html)

// PDFSharp: XFont objects
var titleFont = new XFont("Arial", 24, XFontStyle.Bold);
var bodyFont = new XFont("Times New Roman", 12);

// IronPDF: CSS font properties
var html = @"
<style>
    h1 { font-family: Arial, sans-serif; font-size: 24px; font-weight: bold; }
    p { font-family: 'Times New Roman', serif; font-size: 12px; }
</style>";

Dim titleFont As New XFont("Arial", 24, XFontStyle.Bold)
Dim bodyFont As New XFont("Times New Roman", 12)

Dim html As String = "
<style>
    h1 { font-family: Arial, sans-serif; font-size: 24px; font-weight: bold; }
    p { font-family: 'Times New Roman', serif; font-size: 12px; }
</style>"

// PDFSharp: PdfReader.Open()
PdfDocument document = PdfReader.Open("existing.pdf", PdfDocumentOpenMode.Modify);

// IronPDF: PdfDocument.FromFile()
var pdf = PdfDocument.FromFile("existing.pdf");

Imports PdfSharp
Imports IronPDF

' PDFSharp: PdfReader.Open()
Dim document As PdfDocument = PdfReader.Open("existing.pdf", PdfDocumentOpenMode.Modify)

' IronPDF: PdfDocument.FromFile()
Dim pdf = PdfDocument.FromFile("existing.pdf")

// PDFSharp: document.Save()
document.Save("output.pdf");

// IronPDF: pdf.SaveAs()
pdf.SaveAs("output.pdf");

// PDFSharp: document.Pages[0]
PdfPage page = document.Pages[0];

// IronPDF:自動化page handling or pdf.Pages[0]
// Pages are created automatically from HTML content

' PDFSharp: document.Pages(0)
Dim page As PdfPage = document.Pages(0)

' IronPDF:自動化page handling or pdf.Pages(0)
' Pages are created automatically from HTML content

var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<h1>Modern Web Content</h1>");

Dim renderer As New ChromePdfRenderer()
Dim pdf = renderer.RenderHtmlAsPdf("<h1>Modern Web Content</h1>")

var pdf = renderer.RenderUrlAsPdf("https://example.com");

Dim pdf = renderer.RenderUrlAsPdf("https://example.com")

var pdf1 = PdfDocument.FromFile("document1.pdf");
var pdf2 = PdfDocument.FromFile("document2.pdf");
var merged = PdfDocument.Merge(pdf1, pdf2);

Dim pdf1 = PdfDocument.FromFile("document1.pdf")
Dim pdf2 = PdfDocument.FromFile("document2.pdf")
Dim merged = PdfDocument.Merge(pdf1, pdf2)

pdf.ApplyWatermark("<h2 style='color:red;'>CONFIDENTIAL</h2>");

pdf.ApplyWatermark("<h2 style='color:red;'>CONFIDENTIAL</h2>")