如何使用C#在PDF文件中嵌入UTF-8字符

# In Visual Studio: References -> remove PDFDuo.dll (and any associated
# PDF Duo files) and delete the vendored binary from your /lib folder.

# Install 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 all PDF Duo references
grep -r "DuoDimension\|HtmlToPdf\b\|OpenHTML\|SavePDF" --include="*.cs" .

//PDF Duo .NETis not on NuGet — reference PDFDuo.dll from the vendor download.
using DuoDimension;
using System;
using System.IO;

class Program
{
    static void Main()
    {
        // OpenHTML accepts a file path, URL, or stream; there is no documented
        // "convert HTML string" call, so write the markup to a temp file first.
        var tempHtml = Path.GetTempFileName() + ".html";
        File.WriteAllText(tempHtml, "<h1>Hello World</h1><p>This is a PDF document.</p>");

        var conv = new HtmlToPdf();
        conv.OpenHTML(tempHtml);
        conv.SavePDF("output.pdf");
        Console.WriteLine("PDF created successfully!");
    }
}

Imports DuoDimension
Imports System
Imports System.IO

Module Program
    Sub Main()
        ' OpenHTML accepts a file path, URL, or stream; there is no documented
        ' "convert HTML string" call, so write the markup to a temp file first.
        Dim tempHtml As String = Path.GetTempFileName() & ".html"
        File.WriteAllText(tempHtml, "<h1>Hello World</h1><p>This is a PDF document.</p>")

        Dim conv As New HtmlToPdf()
        conv.OpenHTML(tempHtml)
        conv.SavePDF("output.pdf")
        Console.WriteLine("PDF created successfully!")
    End Sub
End Module

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

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        var htmlContent = "<h1>Hello World</h1><p>This is a PDF document.</p>";
        var pdf = renderer.RenderHtmlAsPdf(htmlContent);
        pdf.SaveAs("output.pdf");
        Console.WriteLine("PDF created successfully!");
    }
}

Imports IronPdf
Imports System

Class Program
    Shared Sub Main()
        Dim renderer = New ChromePdfRenderer()
        Dim htmlContent = "<h1>Hello World</h1><p>This is a PDF document.</p>"
        Dim pdf = renderer.RenderHtmlAsPdf(htmlContent)
        pdf.SaveAs("output.pdf")
        Console.WriteLine("PDF created successfully!")
    End Sub
End Class

//PDF Duo .NETis not on NuGet — reference PDFDuo.dll from the vendor download.
using DuoDimension;
using System;

class Program
{
    static void Main()
    {
        var conv = new HtmlToPdf();
        conv.OpenHTML("https://www.example.com");
        conv.SavePDF("webpage.pdf");
        Console.WriteLine("Webpage converted to PDF!");
    }
}

Imports DuoDimension
Imports System

Module Program
    Sub Main()
        Dim conv As New HtmlToPdf()
        conv.OpenHTML("https://www.example.com")
        conv.SavePDF("webpage.pdf")
        Console.WriteLine("Webpage converted to PDF!")
    End Sub
End Module

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

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderUrlAsPdf("https://www.example.com");
        pdf.SaveAs("webpage.pdf");
        Console.WriteLine("Webpage converted to PDF!");
    }
}

Imports IronPdf
Imports System

Class Program
    Shared Sub Main()
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = renderer.RenderUrlAsPdf("https://www.example.com")
        pdf.SaveAs("webpage.pdf")
        Console.WriteLine("Webpage converted to PDF!")
    End Sub
End Class

//PDF Duo .NETis not on NuGet — reference PDFDuo.dll from the vendor download.
using DuoDimension;
using System;

class Program
{
    static void Main()
    {
        // Render each source HTML to its own PDF
        var conv = new HtmlToPdf();
        conv.OpenHTML("page1.html");
        conv.SavePDF("document1.pdf");

        conv = new HtmlToPdf();
        conv.OpenHTML("page2.html");
        conv.SavePDF("document2.pdf");

        // Merging into a single PDF requires another library (e.g., iTextSharp).
        Console.WriteLine("PDF Duo has no native merge — combine output with another library.");
    }
}

Imports DuoDimension
Imports System

Module Program
    Sub Main()
        ' Render each source HTML to its own PDF
        Dim conv As New HtmlToPdf()
        conv.OpenHTML("page1.html")
        conv.SavePDF("document1.pdf")

        conv = New HtmlToPdf()
        conv.OpenHTML("page2.html")
        conv.SavePDF("document2.pdf")

        ' Merging into a single PDF requires another library (e.g., iTextSharp).
        Console.WriteLine("PDF Duo has no native merge — combine output with another library.")
    End Sub
End Module

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

class Program
{
    static void Main()
    {
        var pdf1 = PdfDocument.FromFile("document1.pdf");
        var pdf2 = PdfDocument.FromFile("document2.pdf");
        var merged = PdfDocument.Merge(pdf1, pdf2);
        merged.SaveAs("merged.pdf");
        Console.WriteLine("PDFs merged successfully!");
    }
}

Imports IronPdf
Imports System

Class Program
    Shared Sub Main()
        Dim pdf1 = PdfDocument.FromFile("document1.pdf")
        Dim pdf2 = PdfDocument.FromFile("document2.pdf")
        Dim merged = PdfDocument.Merge(pdf1, pdf2)
        merged.SaveAs("merged.pdf")
        Console.WriteLine("PDFs merged successfully!")
    End Sub
End Class

var paths = new[] { "document1.pdf", "document2.pdf", "document3.pdf" };
var pdfs = paths.Select(PdfDocument.FromFile).ToList();
var merged = PdfDocument.Merge(pdfs);
merged.SaveAs("merged.pdf");

Dim paths = {"document1.pdf", "document2.pdf", "document3.pdf"}
Dim pdfs = paths.Select(AddressOf PdfDocument.FromFile).ToList()
Dim merged = PdfDocument.Merge(pdfs)
merged.SaveAs("merged.pdf")

using IronPdf;

var renderer = new ChromePdfRenderer();

renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter
{
    HtmlFragment = "<div style='text-align:center; font-size:10px;'>Company Report</div>",
    MaxHeight = 25
};

renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
{
    HtmlFragment = "<div style='text-align:center; font-size:10px;'>Page {page} of {total-pages}</div>",
    MaxHeight = 25
};

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

Imports IronPdf

Dim renderer As New ChromePdfRenderer()

renderer.RenderingOptions.HtmlHeader = New HtmlHeaderFooter With {
    .HtmlFragment = "<div style='text-align:center; font-size:10px;'>Company Report</div>",
    .MaxHeight = 25
}

renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter With {
    .HtmlFragment = "<div style='text-align:center; font-size:10px;'>Page {page} of {total-pages}</div>",
    .MaxHeight = 25
}

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

using IronPdf;
using IronPdf.Editing;

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

pdf.ApplyWatermark(
    "<h1 style='color:red; opacity:0.3;'>CONFIDENTIAL</h1>",
    45,
    VerticalAlignment.Middle,
    HorizontalAlignment.Center);

pdf.SaveAs("watermarked.pdf");

Imports IronPdf
Imports IronPdf.Editing

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

pdf.ApplyWatermark("<h1 style='color:red; opacity:0.3;'>CONFIDENTIAL</h1>", 45, VerticalAlignment.Middle, HorizontalAlignment.Center)

pdf.SaveAs("watermarked.pdf")

var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SecuritySettings.UserPassword = "userpassword";
pdf.SecuritySettings.OwnerPassword = "ownerpassword";
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
pdf.SaveAs("secured.pdf");

Dim pdf = renderer.RenderHtmlAsPdf(html)
pdf.SecuritySettings.UserPassword = "userpassword"
pdf.SecuritySettings.OwnerPassword = "ownerpassword"
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights
pdf.SaveAs("secured.pdf")

var pdf = PdfDocument.FromFile("document.pdf");
string text = pdf.ExtractAllText();

Dim pdf = PdfDocument.FromFile("document.pdf")
Dim text As String = pdf.ExtractAllText()

// PDF Duo: no documented per-instance settings — OpenHTML / SavePDF only.

// IronPDF:
renderer.RenderingOptions.PaperSize    = PdfPaperSize.A4;
renderer.RenderingOptions.MarginTop    = 20;
renderer.RenderingOptions.MarginRight  = 15;
renderer.RenderingOptions.MarginBottom = 20;
renderer.RenderingOptions.MarginLeft   = 15;

' PDF Duo: no documented per-instance settings — OpenHTML / SavePDF only.

' IronPDF:
renderer.RenderingOptions.PaperSize = PdfPaperSize.A4
renderer.RenderingOptions.MarginTop = 20
renderer.RenderingOptions.MarginRight = 15
renderer.RenderingOptions.MarginBottom = 20
renderer.RenderingOptions.MarginLeft = 15

// PDF Duo:
conv.SavePDF("output.pdf");

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

' PDF Duo:
conv.SavePDF("output.pdf")

' IronPDF:
pdf.SaveAs("output.pdf")

// PDF Duo: no equivalent.

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

Imports IronPdf

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

// PDF Duo:
File.WriteAllText("temp.html", html);
var conv = new DuoDimension.HtmlToPdf();
conv.OpenHTML("temp.html");
conv.SavePDF("output.pdf");

// IronPDF:
var renderer = new ChromePdfRenderer();
renderer.RenderHtmlAsPdf(html).SaveAs("output.pdf");

' PDF Duo:
File.WriteAllText("temp.html", html)
Dim conv = New DuoDimension.HtmlToPdf()
conv.OpenHTML("temp.html")
conv.SavePDF("output.pdf")

' IronPDF:
Dim renderer = New ChromePdfRenderer()
renderer.RenderHtmlAsPdf(html).SaveAs("output.pdf")