迁移指南

从 ActivePDF 迁移到 IronPDF：(.NET指南）

已更新:2026年2月1日

ActivePDF 一直是 .NET 开发人员可靠的 PDF 工具包。然而，自从 Foxit 收购了该平台以来，许多开发团队对该平台的未来、许可条款和持续开发感到不确定。本指南提供了从ActivePDF到IronPDF的完整、分步迁移路径——IronPDF 是一个现代化的、积极维护的 .NET PDF 库，支持 .NET Framework 4.6.2 到 .NET 9 及更高版本。

为什么要考虑放弃 ActivePDF？

Foxit 收购ActivePDF给在 .NET 应用程序中开发 PDF 生成和处理解决方案的开发人员带来了诸多挑战。

不确定的产品未来

ActivePDF 在 Foxit 的收购下，其发展前景引发了人们对该工具包长期发展道路的疑问。依赖ActivePDF的开发者面临着库过时、支持减少和开发停滞的潜在风险。对于计划将项目延长到 2025 年和 2026 年的团队来说，这种不确定性会带来巨大的技术风险。

许可复杂性

收购带来了许可方面的不确定性，可能会使部署复杂化。ActivePDF传统的机器锁定许可模式在现代云和容器环境中会产生摩擦，在这种环境中，应用程序会在基础设施上动态扩展。

传统架构模式

ActivePDF 的架构反映了以有状态工具包模式为中心的旧设计理念。 OpenOutputFile/CloseOutputFile 工作流需要显式的文件句柄管理，这与现代 C# 约定不符，如果处理不当，可能会引入资源管理问题。

安装和配置开销

与当代基于 NuGet 的软件包管理不同，ActivePDF 在实例化工具包时通常需要手动引用 DLL 和显式路径配置--这种模式增加了入门的摩擦，并使 CI/CD 管道复杂化。

ActivePDF与 IronPDF：主要区别

在开始迁移过程之前，了解ActivePDF和IronPDF之间的根本区别有助于对所需的代码更改设定预期。

方面	ActivePDF	IronPDF
公司状态	被福昕软件收购（前途未卜）	独立、清晰的开发路线图
安装	手动 DLL 引用	简单的 NuGet 软件包</a
API模式	有状态的（`OpenOutputFile`/`CloseOutputFile`）	流畅、实用的 API
许可模式	机器锁定	基于代码的关键字
.NET支持	传统 .NET Framework 重点	Framework 4.6.2 到 .NET 9+
错误处理	整数返回代码	基于异常的现代
支持同步	不可用	完全支持异步/等待

迁移前准备

审核您的代码库

在开始迁移之前，请确定整个解决方案中所有ActivePDF的使用情况。在解决方案目录中运行这些命令：

grep -r "using ActivePDF" --include="*.cs" .
grep -r "using APToolkitNET" --include="*.cs" .
grep -r "APToolkitNET" --include="*.csproj" .

grep -r "using ActivePDF" --include="*.cs" .
grep -r "using APToolkitNET" --include="*.cs" .
grep -r "APToolkitNET" --include="*.csproj" .

SHELL

文档破坏性更改

了解 API 的基本差异有助于规划迁移策略：

翻译类别	ActivePDF 行为	IronPDF 行为	迁移行动
对象模型	单个 `Toolkit` 对象	`ChromePdfRenderer` + `PdfDocument`	单独关注
文件操作	`OpenOutputFile()`/`CloseOutputFile()`	直接 `SaveAs()`	删除打开/关闭调用
页面创建	`NewPage()` 方法	从 HTML 自动生成	删除页面创建调用
返回值	整数错误代码	例外情况	实施 try/catch
页面大小单位	点数（612x792 = 字母）	枚举或毫米	更新测量

前提条件

确保您的环境符合这些要求：

.NET Framework 4.6.2+ 或 .NET Core 3.1 / .NET 5-9
Visual Studio 2019+ 或 JetBrains Rider
访问 NuGet 包管理器 -IronPDF许可证密钥（可在ironpdf.com免费试用）

逐步迁移过程

步骤 1：更新 NuGet 软件包

移除ActivePDF软件包并安装 IronPDF：

# RemoveActivePDFpackage
dotnet remove package APToolkitNET

# Install IronPDF
dotnet add package IronPdf

# RemoveActivePDFpackage
dotnet remove package APToolkitNET

# Install IronPDF
dotnet add package IronPdf

SHELL

也可通过 Visual Studio 软件包管理器控制台进行翻译：

Uninstall-Package APToolkitNET
Install-Package IronPdf

对于手动引用 DLL 的项目，请从您的 .csproj 文件中删除该引用：


<Reference Include="APToolkitNET">
    <HintPath>path\to\APToolkitNET.dll</HintPath>
</Reference>


<Reference Include="APToolkitNET">
    <HintPath>path\to\APToolkitNET.dll</HintPath>
</Reference>

XML

步骤 2：配置许可证密钥

在启动应用程序时，在进行任何 PDF 操作前，添加IronPDF许可证密钥：

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

// Verify license status
bool isLicensed = IronPdf.License.IsLicensed;

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

// Verify license status
bool isLicensed = IronPdf.License.IsLicensed;

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

' Verify license status
Dim isLicensed As Boolean = IronPdf.License.IsLicensed

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步骤 3：更新命名空间引用

在解决方案中执行全局查找和替换：

查找	替换为
`using ActivePDF.Toolkit;`	`using IronPdf;`
`using APToolkitNET;`	`using IronPdf;`
`using APToolkitNET.PDFObjects;`	`using IronPdf;`
`using APToolkitNET.Common;`	`using IronPdf;`

完整的 API 迁移参考

文档创建方法

ActivePDF 方法	IronPDF 同等产品
`new Toolkit()`	`new ChromePdfRenderer()`
`toolkit.OpenOutputFile(path)`	无需对等语
`toolkit.CloseOutputFile()`	无需对等语
`toolkit.AddHTML(html)`	`renderer.RenderHtmlAsPdf(html)`
`toolkit.AddURL(url)`	`renderer.RenderUrlAsPdf(url)`
`toolkit.SaveAs(path)`	`pdf.SaveAs(path)`

文件操作

ActivePDF 方法	IronPDF 同等产品
`toolkit.OpenInputFile(path)`	`PdfDocument.FromFile(path)`
`toolkit.AddPDF(path)`	`PdfDocument.Merge()`
`toolkit.GetPageCount()`	`pdf.PageCount`
`toolkit.GetText()`	`pdf.ExtractAllText()`

页面配置

ActivePDF 方法	IronPDF 同等产品
`toolkit.SetPageSize(612, 792)`	`RenderingOptions.PaperSize = PdfPaperSize.Letter`
`toolkit.SetOrientation("Landscape")`	`RenderingOptions.PaperOrientation = PdfPaperOrientation.Landscape`
`toolkit.SetMargins(t, b, l, r)`	`RenderingOptions.MarginTop/Bottom/Left/Right`

安全方法

ActivePDF 方法	IronPDF 同等产品
`toolkit.Encrypt(password)`	`pdf.SecuritySettings.OwnerPassword`
`toolkit.SetUserPassword(pwd)`	`pdf.SecuritySettings.UserPassword`
`toolkit.SetPermissions(flags)`	`pdf.SecuritySettings.AllowUserXxx`
`toolkit.AddWatermark(text)`	`pdf.ApplyWatermark(html)`

代码迁移示例

HTML 到 PDF 转换

将 HTML 字符串转换为 PDF 文档是最常见的 PDF 生成场景之一。下面是代码在迁移过程中的转换过程。

ActivePDF 实现：

// NuGet: Install-Package APToolkitNET
using ActivePDF.Toolkit;
using System;

class Program
{
    static void Main()
    {
        Toolkit toolkit = new Toolkit();

        string htmlContent = "<html><body><h1>Hello World</h1></body></html>";

        if (toolkit.OpenOutputFile("output.pdf") == 0)
        {
            toolkit.AddHTML(htmlContent);
            toolkit.CloseOutputFile();
            Console.WriteLine("PDF created successfully");
        }
    }
}

// NuGet: Install-Package APToolkitNET
using ActivePDF.Toolkit;
using System;

class Program
{
    static void Main()
    {
        Toolkit toolkit = new Toolkit();

        string htmlContent = "<html><body><h1>Hello World</h1></body></html>";

        if (toolkit.OpenOutputFile("output.pdf") == 0)
        {
            toolkit.AddHTML(htmlContent);
            toolkit.CloseOutputFile();
            Console.WriteLine("PDF created successfully");
        }
    }
}

Imports ActivePDF.Toolkit
Imports System

Class Program
    Shared Sub Main()
        Dim toolkit As New Toolkit()

        Dim htmlContent As String = "<html><body><h1>Hello World</h1></body></html>"

        If toolkit.OpenOutputFile("output.pdf") = 0 Then
            toolkit.AddHTML(htmlContent)
            toolkit.CloseOutputFile()
            Console.WriteLine("PDF created successfully")
        End If
    End Sub
End Class

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IronPDF 实现：

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

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();

        string htmlContent = "<html><body><h1>Hello World</h1></body></html>";

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

        Console.WriteLine("PDF created successfully");
    }
}

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

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();

        string htmlContent = "<html><body><h1>Hello World</h1></body></html>";

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

        Console.WriteLine("PDF created successfully");
    }
}

Imports IronPdf
Imports System

Module Program
    Sub Main()
        Dim renderer As New ChromePdfRenderer()

        Dim htmlContent As String = "<html><body><h1>Hello World</h1></body></html>"

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

        Console.WriteLine("PDF created successfully")
    End Sub
End Module

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IronPDF 方法消除了显式文件句柄管理，同时提供了更简洁、可读性更强的代码。对于高级HTML 转 PDF 场景，IronPDF 的 ChromePdfRenderer 使用基于 Chromium 的渲染引擎，实现像素级完美的 CSS 和 JavaScript 支持。

URL到PDF转换

将网页截取为 PDF 文档也遵循类似的现代化模式。

ActivePDF 实现：

using ActivePDF.Toolkit;
using System;

class Program
{
    static void Main()
    {
        Toolkit toolkit = new Toolkit();

        string url = "https://www.example.com";

        if (toolkit.OpenOutputFile("webpage.pdf") == 0)
        {
            toolkit.AddURL(url);
            toolkit.CloseOutputFile();
            Console.WriteLine("PDF from URL created successfully");
        }
    }
}

using ActivePDF.Toolkit;
using System;

class Program
{
    static void Main()
    {
        Toolkit toolkit = new Toolkit();

        string url = "https://www.example.com";

        if (toolkit.OpenOutputFile("webpage.pdf") == 0)
        {
            toolkit.AddURL(url);
            toolkit.CloseOutputFile();
            Console.WriteLine("PDF from URL created successfully");
        }
    }
}

Imports ActivePDF.Toolkit
Imports System

Class Program
    Shared Sub Main()
        Dim toolkit As New Toolkit()

        Dim url As String = "https://www.example.com"

        If toolkit.OpenOutputFile("webpage.pdf") = 0 Then
            toolkit.AddURL(url)
            toolkit.CloseOutputFile()
            Console.WriteLine("PDF from URL created successfully")
        End If
    End Sub
End Class

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IronPDF 实现：

using IronPdf;
using System;

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();

        string url = "https://www.example.com";

        var pdf = renderer.RenderUrlAsPdf(url);
        pdf.SaveAs("webpage.pdf");

        Console.WriteLine("PDF from URL created successfully");
    }
}

using IronPdf;
using System;

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();

        string url = "https://www.example.com";

        var pdf = renderer.RenderUrlAsPdf(url);
        pdf.SaveAs("webpage.pdf");

        Console.WriteLine("PDF from URL created successfully");
    }
}

Imports IronPdf
Imports System

Class Program
    Shared Sub Main()
        Dim renderer = New ChromePdfRenderer()

        Dim url As String = "https://www.example.com"

        Dim pdf = renderer.RenderUrlAsPdf(url)
        pdf.SaveAs("webpage.pdf")

        Console.WriteLine("PDF from URL created successfully")
    End Sub
End Class

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合并多个 PDF 文件

将多个 PDF 文档合并为一个文件展示了IronPDF的文档操作功能方法。

ActivePDF 实现：

using ActivePDF.Toolkit;
using System;

class Program
{
    static void Main()
    {
        Toolkit toolkit = new Toolkit();

        if (toolkit.OpenOutputFile("merged.pdf") == 0)
        {
            toolkit.AddPDF("document1.pdf");
            toolkit.AddPDF("document2.pdf");
            toolkit.CloseOutputFile();
            Console.WriteLine("PDFs merged successfully");
        }
    }
}

using ActivePDF.Toolkit;
using System;

class Program
{
    static void Main()
    {
        Toolkit toolkit = new Toolkit();

        if (toolkit.OpenOutputFile("merged.pdf") == 0)
        {
            toolkit.AddPDF("document1.pdf");
            toolkit.AddPDF("document2.pdf");
            toolkit.CloseOutputFile();
            Console.WriteLine("PDFs merged successfully");
        }
    }
}

Imports ActivePDF.Toolkit
Imports System

Class Program
    Shared Sub Main()
        Dim toolkit As New Toolkit()

        If toolkit.OpenOutputFile("merged.pdf") = 0 Then
            toolkit.AddPDF("document1.pdf")
            toolkit.AddPDF("document2.pdf")
            toolkit.CloseOutputFile()
            Console.WriteLine("PDFs merged successfully")
        End If
    End Sub
End Class

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IronPDF 实现：

using IronPdf;
using System;
using System.Collections.Generic;

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");
    }
}

using IronPdf;
using System;
using System.Collections.Generic;

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
Imports System.Collections.Generic

Module Program
    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 Module

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有关包括选择性页面提取在内的更高级合并方案，请参阅 IronPDF合并文档。

添加页眉和页脚

ActivePDF 实现：

using ActivePDF.Toolkit;

public void CreatePdfWithHeaderFooter(string html, string outputPath)
{
    Toolkit toolkit = new Toolkit();

    if (toolkit.OpenOutputFile(outputPath) == 0)
    {
        toolkit.SetHeader("My Document", 12, "Arial");
        toolkit.SetFooter("Page %p of %P", 10, "Arial");
        toolkit.AddHTML(html);
        toolkit.CloseOutputFile();
    }
}

using ActivePDF.Toolkit;

public void CreatePdfWithHeaderFooter(string html, string outputPath)
{
    Toolkit toolkit = new Toolkit();

    if (toolkit.OpenOutputFile(outputPath) == 0)
    {
        toolkit.SetHeader("My Document", 12, "Arial");
        toolkit.SetFooter("Page %p of %P", 10, "Arial");
        toolkit.AddHTML(html);
        toolkit.CloseOutputFile();
    }
}

Imports ActivePDF.Toolkit

Public Sub CreatePdfWithHeaderFooter(html As String, outputPath As String)
    Dim toolkit As New Toolkit()

    If toolkit.OpenOutputFile(outputPath) = 0 Then
        toolkit.SetHeader("My Document", 12, "Arial")
        toolkit.SetFooter("Page %p of %P", 10, "Arial")
        toolkit.AddHTML(html)
        toolkit.CloseOutputFile()
    End If
End Sub

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IronPDF 实现：

using IronPdf;

public void CreatePdfWithHeaderFooter(string html, string outputPath)
{
    var renderer = new ChromePdfRenderer();

    renderer.RenderingOptions.TextHeader = new TextHeaderFooter
    {
        CenterText = "My Document",
        FontSize = 12,
        FontFamily = "Arial"
    };

    renderer.RenderingOptions.TextFooter = new TextHeaderFooter
    {
        CenterText = "Page {page} of {total-pages}",
        FontSize = 10,
        FontFamily = "Arial"
    };

    using var pdf = renderer.RenderHtmlAsPdf(html);
    pdf.SaveAs(outputPath);
}

using IronPdf;

public void CreatePdfWithHeaderFooter(string html, string outputPath)
{
    var renderer = new ChromePdfRenderer();

    renderer.RenderingOptions.TextHeader = new TextHeaderFooter
    {
        CenterText = "My Document",
        FontSize = 12,
        FontFamily = "Arial"
    };

    renderer.RenderingOptions.TextFooter = new TextHeaderFooter
    {
        CenterText = "Page {page} of {total-pages}",
        FontSize = 10,
        FontFamily = "Arial"
    };

    using var pdf = renderer.RenderHtmlAsPdf(html);
    pdf.SaveAs(outputPath);
}

Imports IronPdf

Public Sub CreatePdfWithHeaderFooter(html As String, outputPath As String)
    Dim renderer = New ChromePdfRenderer()

    renderer.RenderingOptions.TextHeader = New TextHeaderFooter With {
        .CenterText = "My Document",
        .FontSize = 12,
        .FontFamily = "Arial"
    }

    renderer.RenderingOptions.TextFooter = New TextHeaderFooter With {
        .CenterText = "Page {page} of {total-pages}",
        .FontSize = 10,
        .FontFamily = "Arial"
    }

    Using pdf = renderer.RenderHtmlAsPdf(html)
        pdf.SaveAs(outputPath)
    End Using
End Sub

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IronPDF 支持基于文本的页眉和页脚HTML页眉和页脚，提供完全灵活的设计。

密码保护和安全性

ActivePDF 实现：

using ActivePDF.Toolkit;

public void ProtectPdf(string inputPath, string outputPath, string password)
{
    Toolkit toolkit = new Toolkit();

    if (toolkit.OpenInputFile(inputPath) == 0)
    {
        toolkit.Encrypt(password);
        toolkit.SetUserPassword(password);
        toolkit.SetPermissions(4); // Print only
        toolkit.SaveAs(outputPath);
        toolkit.CloseInputFile();
    }
}

using ActivePDF.Toolkit;

public void ProtectPdf(string inputPath, string outputPath, string password)
{
    Toolkit toolkit = new Toolkit();

    if (toolkit.OpenInputFile(inputPath) == 0)
    {
        toolkit.Encrypt(password);
        toolkit.SetUserPassword(password);
        toolkit.SetPermissions(4); // Print only
        toolkit.SaveAs(outputPath);
        toolkit.CloseInputFile();
    }
}

Imports ActivePDF.Toolkit

Public Sub ProtectPdf(inputPath As String, outputPath As String, password As String)
    Dim toolkit As New Toolkit()

    If toolkit.OpenInputFile(inputPath) = 0 Then
        toolkit.Encrypt(password)
        toolkit.SetUserPassword(password)
        toolkit.SetPermissions(4) ' Print only
        toolkit.SaveAs(outputPath)
        toolkit.CloseInputFile()
    End If
End Sub

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IronPDF 实现：

using IronPdf;

public void ProtectPdf(string inputPath, string outputPath, string password)
{
    using var pdf = PdfDocument.FromFile(inputPath);

    pdf.SecuritySettings.OwnerPassword = password;
    pdf.SecuritySettings.UserPassword = password;
    pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.FullPrintRights;
    pdf.SecuritySettings.AllowUserCopyPasteContent = false;
    pdf.SecuritySettings.AllowUserEdits = PdfEditSecurity.NoEdit;

    pdf.SaveAs(outputPath);
}

using IronPdf;

public void ProtectPdf(string inputPath, string outputPath, string password)
{
    using var pdf = PdfDocument.FromFile(inputPath);

    pdf.SecuritySettings.OwnerPassword = password;
    pdf.SecuritySettings.UserPassword = password;
    pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.FullPrintRights;
    pdf.SecuritySettings.AllowUserCopyPasteContent = false;
    pdf.SecuritySettings.AllowUserEdits = PdfEditSecurity.NoEdit;

    pdf.SaveAs(outputPath);
}

Imports IronPdf

Public Sub ProtectPdf(inputPath As String, outputPath As String, password As String)
    Using pdf = PdfDocument.FromFile(inputPath)
        pdf.SecuritySettings.OwnerPassword = password
        pdf.SecuritySettings.UserPassword = password
        pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.FullPrintRights
        pdf.SecuritySettings.AllowUserCopyPasteContent = False
        pdf.SecuritySettings.AllowUserEdits = PdfEditSecurity.NoEdit

        pdf.SaveAs(outputPath)
    End Using
End Sub

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IronPDF 的安全设置 API 使用强类型枚举而非整数标志对文档权限进行细粒度控制。

文本提取

ActivePDF 实现：

using ActivePDF.Toolkit;

public string ExtractText(string pdfPath)
{
    Toolkit toolkit = new Toolkit();
    string text = "";

    if (toolkit.OpenInputFile(pdfPath) == 0)
    {
        int pageCount = toolkit.GetPageCount();
        for (int i = 1; i <= pageCount; i++)
        {
            text += toolkit.GetTextFromPage(i) + "\n";
        }
        toolkit.CloseInputFile();
    }

    return text;
}

using ActivePDF.Toolkit;

public string ExtractText(string pdfPath)
{
    Toolkit toolkit = new Toolkit();
    string text = "";

    if (toolkit.OpenInputFile(pdfPath) == 0)
    {
        int pageCount = toolkit.GetPageCount();
        for (int i = 1; i <= pageCount; i++)
        {
            text += toolkit.GetTextFromPage(i) + "\n";
        }
        toolkit.CloseInputFile();
    }

    return text;
}

Imports ActivePDF.Toolkit

Public Function ExtractText(pdfPath As String) As String
    Dim toolkit As New Toolkit()
    Dim text As String = ""

    If toolkit.OpenInputFile(pdfPath) = 0 Then
        Dim pageCount As Integer = toolkit.GetPageCount()
        For i As Integer = 1 To pageCount
            text &= toolkit.GetTextFromPage(i) & vbCrLf
        Next
        toolkit.CloseInputFile()
    End If

    Return text
End Function

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IronPDF 实现：

using IronPdf;

public string ExtractText(string pdfPath)
{
    using var pdf = PdfDocument.FromFile(pdfPath);
    return pdf.ExtractAllText();
}

using IronPdf;

public string ExtractText(string pdfPath)
{
    using var pdf = PdfDocument.FromFile(pdfPath);
    return pdf.ExtractAllText();
}

Imports IronPdf

Public Function ExtractText(pdfPath As String) As String
    Using pdf = PdfDocument.FromFile(pdfPath)
        Return pdf.ExtractAllText()
    End Using
End Function

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IronPDF 实现将文本提取从多行减少到单个方法调用。

添加水印

ActivePDF 实现：

using ActivePDF.Toolkit;

public void AddWatermark(string inputPath, string outputPath, string watermarkText)
{
    Toolkit toolkit = new Toolkit();

    if (toolkit.OpenInputFile(inputPath) == 0)
    {
        int pageCount = toolkit.GetPageCount();
        for (int i = 1; i <= pageCount; i++)
        {
            toolkit.SetPage(i);
            toolkit.AddWatermark(watermarkText, 45, 0.5f);
        }
        toolkit.SaveAs(outputPath);
        toolkit.CloseInputFile();
    }
}

using ActivePDF.Toolkit;

public void AddWatermark(string inputPath, string outputPath, string watermarkText)
{
    Toolkit toolkit = new Toolkit();

    if (toolkit.OpenInputFile(inputPath) == 0)
    {
        int pageCount = toolkit.GetPageCount();
        for (int i = 1; i <= pageCount; i++)
        {
            toolkit.SetPage(i);
            toolkit.AddWatermark(watermarkText, 45, 0.5f);
        }
        toolkit.SaveAs(outputPath);
        toolkit.CloseInputFile();
    }
}

Imports ActivePDF.Toolkit

Public Sub AddWatermark(inputPath As String, outputPath As String, watermarkText As String)
    Dim toolkit As New Toolkit()

    If toolkit.OpenInputFile(inputPath) = 0 Then
        Dim pageCount As Integer = toolkit.GetPageCount()
        For i As Integer = 1 To pageCount
            toolkit.SetPage(i)
            toolkit.AddWatermark(watermarkText, 45, 0.5F)
        Next
        toolkit.SaveAs(outputPath)
        toolkit.CloseInputFile()
    End If
End Sub

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IronPDF 实现：

using IronPdf;

public void AddWatermark(string inputPath, string outputPath, string watermarkText)
{
    using var pdf = PdfDocument.FromFile(inputPath);

    pdf.ApplyWatermark(
        $"<h1 style='color:lightgray;font-size:72px;'>{watermarkText}</h1>",
        rotation: 45,
        opacity: 50);

    pdf.SaveAs(outputPath);
}

using IronPdf;

public void AddWatermark(string inputPath, string outputPath, string watermarkText)
{
    using var pdf = PdfDocument.FromFile(inputPath);

    pdf.ApplyWatermark(
        $"<h1 style='color:lightgray;font-size:72px;'>{watermarkText}</h1>",
        rotation: 45,
        opacity: 50);

    pdf.SaveAs(outputPath);
}

Imports IronPdf

Public Sub AddWatermark(inputPath As String, outputPath As String, watermarkText As String)
    Using pdf = PdfDocument.FromFile(inputPath)
        pdf.ApplyWatermark(
            $"<h1 style='color:lightgray;font-size:72px;'>{watermarkText}</h1>",
            rotation:=45,
            opacity:=50)

        pdf.SaveAs(outputPath)
    End Using
End Sub

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IronPDF 的基于 HTML 的水印可通过 CSS 风格实现完全的设计控制，无需逐页迭代。

ASP.NET Core 集成

现代网络应用程序从IronPDF更简洁的集成模式中获益匪浅。

ActivePDF模式：

[HttpPost]
public IActionResult GeneratePdf([FromBody] ReportRequest request)
{
    Toolkit toolkit = new Toolkit();

    if (toolkit.OpenOutputFile("temp.pdf") == 0)
    {
        toolkit.AddHTML(request.Html);
        toolkit.CloseOutputFile();

        byte[] bytes = System.IO.File.ReadAllBytes("temp.pdf");
        return File(bytes, "application/pdf", "report.pdf");
    }

    return BadRequest("PDF generation failed");
}

[HttpPost]
public IActionResult GeneratePdf([FromBody] ReportRequest request)
{
    Toolkit toolkit = new Toolkit();

    if (toolkit.OpenOutputFile("temp.pdf") == 0)
    {
        toolkit.AddHTML(request.Html);
        toolkit.CloseOutputFile();

        byte[] bytes = System.IO.File.ReadAllBytes("temp.pdf");
        return File(bytes, "application/pdf", "report.pdf");
    }

    return BadRequest("PDF generation failed");
}

<HttpPost>
Public Function GeneratePdf(<FromBody> request As ReportRequest) As IActionResult
    Dim toolkit As New Toolkit()

    If toolkit.OpenOutputFile("temp.pdf") = 0 Then
        toolkit.AddHTML(request.Html)
        toolkit.CloseOutputFile()

        Dim bytes As Byte() = System.IO.File.ReadAllBytes("temp.pdf")
        Return File(bytes, "application/pdf", "report.pdf")
    End If

    Return BadRequest("PDF generation failed")
End Function

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IronPDF模式：

[HttpPost]
public IActionResult GeneratePdf([FromBody] ReportRequest request)
{
    var renderer = new ChromePdfRenderer();
    using var pdf = renderer.RenderHtmlAsPdf(request.Html);

    return File(pdf.BinaryData, "application/pdf", "report.pdf");
}

[HttpPost]
public IActionResult GeneratePdf([FromBody] ReportRequest request)
{
    var renderer = new ChromePdfRenderer();
    using var pdf = renderer.RenderHtmlAsPdf(request.Html);

    return File(pdf.BinaryData, "application/pdf", "report.pdf");
}

<HttpPost>
Public Function GeneratePdf(<FromBody> request As ReportRequest) As IActionResult
    Dim renderer As New ChromePdfRenderer()
    Using pdf = renderer.RenderHtmlAsPdf(request.Html)
        Return File(pdf.BinaryData, "application/pdf", "report.pdf")
    End Using
End Function

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IronPDF 不需要临时文件，直接从内存返回 PDF 二进制数据。

Web 应用程序的同步支持

ActivePDF 缺乏本地异步支持。IronPDF提供可扩展网络应用程序所必需的全部异步/等待功能：

using IronPdf;

public async Task<byte[]> GeneratePdfAsync(string html)
{
    var renderer = new ChromePdfRenderer();
    using var pdf = await renderer.RenderHtmlAsPdfAsync(html);
    return pdf.BinaryData;
}

using IronPdf;

public async Task<byte[]> GeneratePdfAsync(string html)
{
    var renderer = new ChromePdfRenderer();
    using var pdf = await renderer.RenderHtmlAsPdfAsync(html);
    return pdf.BinaryData;
}

Imports IronPdf

Public Async Function GeneratePdfAsync(html As String) As Task(Of Byte())
    Dim renderer As New ChromePdfRenderer()
    Using pdf = Await renderer.RenderHtmlAsPdfAsync(html)
        Return pdf.BinaryData
    End Using
End Function

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依赖注入配置

对于 .NET 6+ 应用程序，请在 DI 容器中注册IronPDF服务：

// Program.cs (.NET 6+)
builder.Services.AddSingleton<ChromePdfRenderer>();

// Service wrapper
public interface IPdfService
{
    Task<byte[]> GeneratePdfAsync(string html);
    Task<byte[]> GeneratePdfFromUrlAsync(string url);
}

public class IronPdfService : IPdfService
{
    private readonly ChromePdfRenderer _renderer;

    public IronPdfService()
    {
        _renderer = new ChromePdfRenderer();
        _renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
    }

    public async Task<byte[]> GeneratePdfAsync(string html)
    {
        using var pdf = await _renderer.RenderHtmlAsPdfAsync(html);
        return pdf.BinaryData;
    }

    public async Task<byte[]> GeneratePdfFromUrlAsync(string url)
    {
        using var pdf = await _renderer.RenderUrlAsPdfAsync(url);
        return pdf.BinaryData;
    }
}

// Program.cs (.NET 6+)
builder.Services.AddSingleton<ChromePdfRenderer>();

// Service wrapper
public interface IPdfService
{
    Task<byte[]> GeneratePdfAsync(string html);
    Task<byte[]> GeneratePdfFromUrlAsync(string url);
}

public class IronPdfService : IPdfService
{
    private readonly ChromePdfRenderer _renderer;

    public IronPdfService()
    {
        _renderer = new ChromePdfRenderer();
        _renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
    }

    public async Task<byte[]> GeneratePdfAsync(string html)
    {
        using var pdf = await _renderer.RenderHtmlAsPdfAsync(html);
        return pdf.BinaryData;
    }

    public async Task<byte[]> GeneratePdfFromUrlAsync(string url)
    {
        using var pdf = await _renderer.RenderUrlAsPdfAsync(url);
        return pdf.BinaryData;
    }
}

Imports Microsoft.Extensions.DependencyInjection
Imports System.Threading.Tasks

' Program.vb (.NET 6+)
builder.Services.AddSingleton(Of ChromePdfRenderer)()

' Service wrapper
Public Interface IPdfService
    Function GeneratePdfAsync(html As String) As Task(Of Byte())
    Function GeneratePdfFromUrlAsync(url As String) As Task(Of Byte())
End Interface

Public Class IronPdfService
    Implements IPdfService

    Private ReadOnly _renderer As ChromePdfRenderer

    Public Sub New()
        _renderer = New ChromePdfRenderer()
        _renderer.RenderingOptions.PaperSize = PdfPaperSize.A4
    End Sub

    Public Async Function GeneratePdfAsync(html As String) As Task(Of Byte()) Implements IPdfService.GeneratePdfAsync
        Using pdf = Await _renderer.RenderHtmlAsPdfAsync(html)
            Return pdf.BinaryData
        End Using
    End Function

    Public Async Function GeneratePdfFromUrlAsync(url As String) As Task(Of Byte()) Implements IPdfService.GeneratePdfFromUrlAsync
        Using pdf = Await _renderer.RenderUrlAsPdfAsync(url)
            Return pdf.BinaryData
        End Using
    End Function
End Class

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错误处理迁移

ActivePDF 使用整数返回代码，需要查找表。IronPDF使用现代异常处理技术：

ActivePDF 错误处理：

Toolkit toolkit = new Toolkit();
int result = toolkit.OpenOutputFile(path);

if (result != 0)
{
    // Error - need to look up error code
    Console.WriteLine($"Error code: {result}");
}

Toolkit toolkit = new Toolkit();
int result = toolkit.OpenOutputFile(path);

if (result != 0)
{
    // Error - need to look up error code
    Console.WriteLine($"Error code: {result}");
}

Dim toolkit As New Toolkit()
Dim result As Integer = toolkit.OpenOutputFile(path)

If result <> 0 Then
    ' Error - need to look up error code
    Console.WriteLine($"Error code: {result}")
End If

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IronPDF 错误处理：

try
{
    var renderer = new ChromePdfRenderer();
    using var pdf = renderer.RenderHtmlAsPdf(html);
    pdf.SaveAs(path);
}
catch (IronPdf.Exceptions.IronPdfProductException ex)
{
    Console.WriteLine($"IronPDF Error: {ex.Message}");
}
catch (Exception ex)
{
    Console.WriteLine($"General Error: {ex.Message}");
}

try
{
    var renderer = new ChromePdfRenderer();
    using var pdf = renderer.RenderHtmlAsPdf(html);
    pdf.SaveAs(path);
}
catch (IronPdf.Exceptions.IronPdfProductException ex)
{
    Console.WriteLine($"IronPDF Error: {ex.Message}");
}
catch (Exception ex)
{
    Console.WriteLine($"General Error: {ex.Message}");
}

Imports IronPdf.Exceptions

Try
    Dim renderer = New ChromePdfRenderer()
    Using pdf = renderer.RenderHtmlAsPdf(html)
        pdf.SaveAs(path)
    End Using
Catch ex As IronPdfProductException
    Console.WriteLine($"IronPDF Error: {ex.Message}")
Catch ex As Exception
    Console.WriteLine($"General Error: {ex.Message}")
End Try

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性能优化技巧

重复使用渲染器实例

创建一个新的 ChromePdfRenderer 会有初始化开销。对于批量操作，请重复使用单个实例：

var renderer = new ChromePdfRenderer();
foreach (var html in htmlList)
{
    using var pdf = renderer.RenderHtmlAsPdf(html);
    pdf.SaveAs($"output_{i}.pdf");
}

var renderer = new ChromePdfRenderer();
foreach (var html in htmlList)
{
    using var pdf = renderer.RenderHtmlAsPdf(html);
    pdf.SaveAs($"output_{i}.pdf");
}

Imports IronPdf

Dim renderer As New ChromePdfRenderer()
For Each html In htmlList
    Using pdf = renderer.RenderHtmlAsPdf(html)
        pdf.SaveAs($"output_{i}.pdf")
    End Using
Next

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在 Web 应用程序中使用异步

对于 ASP.NET Core 应用程序，异步 PDF 生成提高了吞吐量：

public async Task<IActionResult> GenerateReport()
{
    var renderer = new ChromePdfRenderer();
    using var pdf = await renderer.RenderHtmlAsPdfAsync(html);
    return File(pdf.BinaryData, "application/pdf");
}

public async Task<IActionResult> GenerateReport()
{
    var renderer = new ChromePdfRenderer();
    using var pdf = await renderer.RenderHtmlAsPdfAsync(html);
    return File(pdf.BinaryData, "application/pdf");
}

Imports System.Threading.Tasks
Imports Microsoft.AspNetCore.Mvc

Public Class ReportController
    Inherits Controller

    Public Async Function GenerateReport() As Task(Of IActionResult)
        Dim renderer As New ChromePdfRenderer()
        Using pdf = Await renderer.RenderHtmlAsPdfAsync(html)
            Return File(pdf.BinaryData, "application/pdf")
        End Using
    End Function
End Class

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正确的资源处置

始终使用 using 语句以确保正确清理：

using var pdf = renderer.RenderHtmlAsPdf(html);
return pdf.BinaryData;

using var pdf = renderer.RenderHtmlAsPdf(html);
return pdf.BinaryData;

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图像压缩

通过图像压缩减少输出文件大小：

using var pdf = renderer.RenderHtmlAsPdf(html);
pdf.CompressImages(85); // 85% quality
pdf.SaveAs("compressed.pdf");

using var pdf = renderer.RenderHtmlAsPdf(html);
pdf.CompressImages(85); // 85% quality
pdf.SaveAs("compressed.pdf");

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常见迁移问题的故障排除

问题：页面大小差异

ActivePDF 使用点（612x792 = Letter），而IronPDF使用枚举或毫米：

// ActivePDF: Points
toolkit.SetPageSize(612, 792);

// IronPDF: Use enum
renderer.RenderingOptions.PaperSize = PdfPaperSize.Letter;
// Or custom in mm:
renderer.RenderingOptions.SetCustomPaperSizeInMillimeters(215.9, 279.4);

// ActivePDF: Points
toolkit.SetPageSize(612, 792);

// IronPDF: Use enum
renderer.RenderingOptions.PaperSize = PdfPaperSize.Letter;
// Or custom in mm:
renderer.RenderingOptions.SetCustomPaperSizeInMillimeters(215.9, 279.4);

' ActivePDF: Points
toolkit.SetPageSize(612, 792)

' IronPDF: Use enum
renderer.RenderingOptions.PaperSize = PdfPaperSize.Letter
' Or custom in mm:
renderer.RenderingOptions.SetCustomPaperSizeInMillimeters(215.9, 279.4)

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问题：缺少 CloseOutputFile 等价函数

IronPDF 使用现代范式，没有明确的文件句柄管理：

// ActivePDF
toolkit.OpenOutputFile(path);
toolkit.AddHTML(html);
toolkit.CloseOutputFile(); // Required!

//IronPDF- no open/close needed
using var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SaveAs(path); // 'using' handles cleanup

// ActivePDF
toolkit.OpenOutputFile(path);
toolkit.AddHTML(html);
toolkit.CloseOutputFile(); // Required!

//IronPDF- no open/close needed
using var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SaveAs(path); // 'using' handles cleanup

' ActivePDF
toolkit.OpenOutputFile(path)
toolkit.AddHTML(html)
toolkit.CloseOutputFile() ' Required!

' IronPDF - no open/close needed
Using pdf = renderer.RenderHtmlAsPdf(html)
    pdf.SaveAs(path) ' 'Using' handles cleanup
End Using

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问题：PDF 渲染空白

如果依赖 JavaScript 的内容呈现空白，请配置呈现延迟：

var renderer = new ChromePdfRenderer();
renderer.RenderingOptions.WaitFor.RenderDelay(2000);
// Or wait for element:
renderer.RenderingOptions.WaitFor.HtmlElementById("content-loaded");

var renderer = new ChromePdfRenderer();
renderer.RenderingOptions.WaitFor.RenderDelay(2000);
// Or wait for element:
renderer.RenderingOptions.WaitFor.HtmlElementById("content-loaded");

Dim renderer = New ChromePdfRenderer()
renderer.RenderingOptions.WaitFor.RenderDelay(2000)
' Or wait for element:
renderer.RenderingOptions.WaitFor.HtmlElementById("content-loaded")

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问题：CSS/ 图像无法加载

为相对路径解析配置基本 URL：

renderer.RenderingOptions.BaseUrl = new Uri("https://yourdomain.com/assets/");

renderer.RenderingOptions.BaseUrl = new Uri("https://yourdomain.com/assets/");

renderer.RenderingOptions.BaseUrl = New Uri("https://yourdomain.com/assets/")

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迁移后核对表

完成代码迁移后，请验证以下内容：

运行所有现有的单元测试和集成测试
将 PDF 输出结果与以前的版本进行直观比较
在测试环境中测试所有 PDF 工作流程
验证许可是否正常工作 (IronPdf.License.IsLicensed)
与之前的实现进行基准性能比较
删除旧的ActivePDF安装文件和 DLL 引用
更新 CI/CD 流水线依赖项
为您的开发团队提供IronPDF模式文档

面向未来的 PDF 解决方案

.NET10即将推出，C# 14也将引入新的语言特性，选择一个积极开发的.NET PDF 库可以确保您的应用程序与不断发展的运行时功能保持兼容。IronPDFfor .NET 承诺支持最新的 .NET 版本，这意味着当您的项目延伸到 2025 年和 2026 年时，您的迁移投资将获得回报。

其他资源

从ActivePDF迁移到IronPDF可通过更简洁的 API、更好的 .NET 集成和积极的长期支持使您的 PDF 生成基础架构现代化。在迁移方面的投资将通过提高代码可维护性、异步功能以及对 PDF 库持续发展的信心而获得回报。

Curtis Chau

立即与工程团队聊天

技术作家

Curtis Chau 拥有卡尔顿大学的计算机科学学士学位，专注于前端开发，精通 Node.js、TypeScript、JavaScript 和 React。他热衷于打造直观且美观的用户界面，喜欢使用现代框架并创建结构良好、视觉吸引力强的手册。

除了开发之外，Curtis 对物联网 (IoT) 有浓厚的兴趣，探索将硬件和软件集成的新方法。在空闲时间，他喜欢玩游戏和构建 Discord 机器人，将他对技术的热爱与创造力相结合。

已更新2026年2月1日

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通过这本完整的 C# 指南，掌握从 ZetPDF 到 IronPDF 的迁移。从基于坐标的库转换到现代的 HTML 到 PDF 解决方案。包括 HTML 转换、合并 PDF 和移除 PDFSharp 依赖性的代码示例。

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已更新2026年2月1日

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通过这本完整的 C# 指南，掌握从 XFINIUM.PDF 到 IronPDF 的迁移。从基于坐标的手动定位切换到声明式 HTML/CSS 渲染。包括替换图形基元和自动布局的代码示例。

从 Haukcode.DinkToPdf 迁移到 IronPDF

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立即开始30天免费试用

从 ActivePDF 迁移到 IronPDF：(.NET指南）

为什么要考虑放弃 ActivePDF？

不确定的产品未来

许可复杂性

传统架构模式

安装和配置开销

ActivePDF与 IronPDF：主要区别

迁移前准备

审核您的代码库

文档破坏性更改

前提条件

逐步迁移过程

步骤 1：更新 NuGet 软件包

步骤 2：配置许可证密钥

步骤 3：更新命名空间引用

完整的 API 迁移参考

文档创建方法

文件操作

页面配置

安全方法

代码迁移示例

HTML 到 PDF 转换

URL到PDF转换

合并多个 PDF 文件

添加页眉和页脚

密码保护和安全性

文本提取

添加水印

ASP.NET Core 集成

Web 应用程序的同步支持

依赖注入配置

错误处理迁移

性能优化技巧

重复使用渲染器实例

在 Web 应用程序中使用异步

正确的资源处置

图像压缩

常见迁移问题的故障排除

问题：页面大小差异

问题：缺少 CloseOutputFile 等价函数

问题：PDF 渲染空白

问题：CSS/ 图像无法加载

迁移后核对表

面向未来的 PDF 解决方案

其他资源

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如何用 C# 从 Scryber.Core 迁移到 IronPDF

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