如何用 C# 用響應式 CSS 將 HTML 轉換為 PDF

# Find allComPDFKitusages in your codebase
grep -r "using ComPDFKit" --include="*.cs" .
grep -r "CPDFDocument\|CPDFPage\|CPDFAnnotation" --include="*.cs" .

# Find NuGet package references
grep -r "ComPDFKit" --include="*.csproj" .

# RemoveComPDFKitpackages
dotnet remove package ComPDFKit.NetCore
dotnet remove package ComPDFKit.NetFramework

# Install IronPDF
dotnet add package IronPdf

// Remove these
using ComPDFKit.PDFDocument;
using ComPDFKit.PDFPage;
using ComPDFKit.PDFAnnotation;
using ComPDFKit.Import;

// Add this
using IronPdf;

Imports IronPdf

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

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

// NuGet: Install-Package ComPDFKit.NetCore
using ComPDFKit.PDFDocument;
using System;

class Program
{
    static void Main()
    {
        // ComPDFKit's .NET SDK has no native HTML-to-PDF rendering.
        // The closest equivalent is to create a blank document and lay
        // out primitives manually, or call ComPDFKit's separate cloud
        // Conversion API (a different SKU).
        var document = CPDFDocument.CreateDocument();
        document.InsertPage(0, 595, 842, string.Empty);

        document.WriteToFilePath("output.pdf");
        document.Release();
    }
}

Imports ComPDFKit.PDFDocument
Imports System

Module Program
    Sub Main()
        ' ComPDFKit's .NET SDK has no native HTML-to-PDF rendering.
        ' The closest equivalent is to create a blank document and lay
        ' out primitives manually, or call ComPDFKit's separate cloud
        ' Conversion API (a different SKU).
        Dim document = CPDFDocument.CreateDocument()
        document.InsertPage(0, 595, 842, String.Empty)

        document.WriteToFilePath("output.pdf")
        document.Release()
    End Sub
End Module

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

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1><p>This is HTML content.</p>");
        pdf.SaveAs("output.pdf");
    }
}

Imports IronPdf
Imports System

Class Program
    Shared Sub Main()
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1><p>This is HTML content.</p>")
        pdf.SaveAs("output.pdf")
    End Sub
End Class

// NuGet: Install-Package ComPDFKit.NetCore
using ComPDFKit.PDFDocument;
using ComPDFKit.Import;
using System;

class Program
{
    static void Main()
    {
        var document1 = CPDFDocument.InitWithFilePath("file1.pdf");
        var document2 = CPDFDocument.InitWithFilePath("file2.pdf");

        // Import pages from document2 into document1
        document1.ImportPagesAtIndex(document2, "0-" + (document2.PageCount - 1), document1.PageCount);

        document1.WriteToFilePath("merged.pdf");
        document1.Release();
        document2.Release();
    }
}

Imports ComPDFKit.PDFDocument
Imports ComPDFKit.Import
Imports System

Module Program
    Sub Main()
        Dim document1 = CPDFDocument.InitWithFilePath("file1.pdf")
        Dim document2 = CPDFDocument.InitWithFilePath("file2.pdf")

        ' Import pages from document2 into document1
        document1.ImportPagesAtIndex(document2, "0-" & (document2.PageCount - 1), document1.PageCount)

        document1.WriteToFilePath("merged.pdf")
        document1.Release()
        document2.Release()
    End Sub
End Module

// NuGet: Install-Package IronPdf
using IronPdf;
using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        var pdf1 = PdfDocument.FromFile("file1.pdf");
        var pdf2 = PdfDocument.FromFile("file2.pdf");

        var merged = PdfDocument.Merge(new List<PdfDocument> { pdf1, pdf2 });
        merged.SaveAs("merged.pdf");
    }
}

Imports IronPdf
Imports System
Imports System.Collections.Generic

Module Program
    Sub Main()
        Dim pdf1 = PdfDocument.FromFile("file1.pdf")
        Dim pdf2 = PdfDocument.FromFile("file2.pdf")

        Dim merged = PdfDocument.Merge(New List(Of PdfDocument) From {pdf1, pdf2})
        merged.SaveAs("merged.pdf")
    End Sub
End Module

// NuGet: Install-Package ComPDFKit.NetCore
using ComPDFKit.PDFDocument;
using ComPDFKit.PDFWatermark;
using System;

class Program
{
    static void Main()
    {
        var document = CPDFDocument.InitWithFilePath("input.pdf");

        CPDFWatermark watermark = document.InitWatermark(
            C_Watermark_Type.WATERMARK_TYPE_TEXT);
        watermark.SetText("CONFIDENTIAL");
        watermark.SetFontName("Helvetica");
        watermark.SetFontSize(48);
        watermark.SetTextRGBColor(255, 0, 0);
        watermark.SetRotation(45);
        watermark.SetOpacity(76); // 0..255
        watermark.SetVertalign(C_Watermark_Vertalign.WATERMARK_VERTALIGN_CENTER);
        watermark.SetHorizalign(C_Watermark_Horizalign.WATERMARK_HORIZALIGN_CENTER);
        watermark.SetPages($"0-{document.PageCount - 1}");
        watermark.SetFront(true);
        watermark.CreateWatermark();

        document.WriteToFilePath("watermarked.pdf");
        document.Release();
    }
}

Imports ComPDFKit.PDFDocument
Imports ComPDFKit.PDFWatermark
Imports System

Class Program
    Shared Sub Main()
        Dim document = CPDFDocument.InitWithFilePath("input.pdf")

        Dim watermark As CPDFWatermark = document.InitWatermark(C_Watermark_Type.WATERMARK_TYPE_TEXT)
        watermark.SetText("CONFIDENTIAL")
        watermark.SetFontName("Helvetica")
        watermark.SetFontSize(48)
        watermark.SetTextRGBColor(255, 0, 0)
        watermark.SetRotation(45)
        watermark.SetOpacity(76) ' 0..255
        watermark.SetVertalign(C_Watermark_Vertalign.WATERMARK_VERTALIGN_CENTER)
        watermark.SetHorizalign(C_Watermark_Horizalign.WATERMARK_HORIZALIGN_CENTER)
        watermark.SetPages($"0-{document.PageCount - 1}")
        watermark.SetFront(True)
        watermark.CreateWatermark()

        document.WriteToFilePath("watermarked.pdf")
        document.Release()
    End Sub
End Class

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

class Program
{
    static void Main()
    {
        var pdf = PdfDocument.FromFile("input.pdf");

        pdf.ApplyWatermark("<h1 style='color:rgba(255,0,0,0.3);'>CONFIDENTIAL</h1>",
            rotation: 45,
            verticalAlignment: VerticalAlignment.Middle,
            horizontalAlignment: HorizontalAlignment.Center);

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

Imports IronPdf
Imports IronPdf.Editing
Imports System

Module Program
    Sub Main()
        Dim pdf = PdfDocument.FromFile("input.pdf")

        pdf.ApplyWatermark("<h1 style='color:rgba(255,0,0,0.3);'>CONFIDENTIAL</h1>", 
                           rotation:=45, 
                           verticalAlignment:=VerticalAlignment.Middle, 
                           horizontalAlignment:=HorizontalAlignment.Center)

        pdf.SaveAs("watermarked.pdf")
    End Sub
End Module

using ComPDFKit.PDFDocument;
using System.Text;

var document = CPDFDocument.InitWithFilePath("document.pdf");

// Extract text (verbose)
var allText = new StringBuilder();
for (int i = 0; i < document.PageCount; i++)
{
    var page = document.PageAtIndex(i);
    var textPage = page.GetTextPage();
    allText.AppendLine(textPage.GetText(0, textPage.CountChars()));
    textPage.Release();
    page.Release();
}

document.WriteToFilePath("output.pdf");
document.Release(); // Must remember to release!

Imports ComPDFKit.PDFDocument
Imports System.Text

Dim document = CPDFDocument.InitWithFilePath("document.pdf")

' Extract text (verbose)
Dim allText As New StringBuilder()
For i As Integer = 0 To document.PageCount - 1
    Dim page = document.PageAtIndex(i)
    Dim textPage = page.GetTextPage()
    allText.AppendLine(textPage.GetText(0, textPage.CountChars()))
    textPage.Release()
    page.Release()
Next

document.WriteToFilePath("output.pdf")
document.Release() ' Must remember to release!

using IronPdf;

var pdf = PdfDocument.FromFile("document.pdf");

// Extract text (one-liner)
string allText = pdf.ExtractAllText();

pdf.SaveAs("output.pdf");
// No Release() needed - GC handles cleanup

Imports IronPdf

Dim pdf = PdfDocument.FromFile("document.pdf")

' Extract text (one-liner)
Dim allText As String = pdf.ExtractAllText()

pdf.SaveAs("output.pdf")
' No Release() needed - GC handles cleanup

using IronPdf;

var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<h1>Confidential Document</h1>");

// Set security
pdf.SecuritySettings.UserPassword = "userPassword";
pdf.SecuritySettings.OwnerPassword = "ownerPassword";
pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.FullPrintRights;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;

pdf.SaveAs("protected.pdf");

Imports IronPdf

Dim renderer As New ChromePdfRenderer()
Dim pdf = renderer.RenderHtmlAsPdf("<h1>Confidential Document</h1>")

' Set security
pdf.SecuritySettings.UserPassword = "userPassword"
pdf.SecuritySettings.OwnerPassword = "ownerPassword"
pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.FullPrintRights
pdf.SecuritySettings.AllowUserCopyPasteContent = False

pdf.SaveAs("protected.pdf")

//ComPDFKit- manual cleanup required
document.Release();
page.Release();
textPage.Release();

//IronPDF- no equivalent needed
// GC handles cleanup automatically

'ComPDFKit- manual cleanup required
document.Release()
page.Release()
textPage.Release()

'IronPDF- no equivalent needed
' GC handles cleanup automatically