迁移指南

从 Foxit PDF SDK 迁移到 IronPDF：(.NET指南）

已更新:2026年2月1日

从福昕 PDF SDK迁移到IronPDF可以简化您的 .NET PDF 生成工作流程，因为它用现代化的、对开发人员友好的模式取代了复杂的、面向企业的 API。本指南提供了一个完整的、分步的迁移路径，可以删除不必要的代码，并简化整个代码库中的 PDF 操作。

为什么要从福昕 PDF SDK 迁移到 IronPDF．

福昕 PDF 的挑战

Foxit PDF SDK 是一个功能强大的企业级库，但它也存在相当大的复杂性，可能会减慢开发速度：

1.复杂的许可系统：多种产品、SKU 和许可类型（按开发者、按服务器、OEM 等）使得为您的项目选择合适的选项变得困难。

2.企业定价：定价是为大型组织量身定制的，对于较小的团队或个人开发人员来说可能难以承受。

3.手动安装：福昕 PDF SDK需要手动 DLL 引用或私有 NuGet 源——没有简单的公共 NuGet 包可用。

4.冗长的 API：使用 Library.Initialize() 进行库初始化、错误代码检查以及显式的 Library.Release() 调用，会为每个操作增加大量的样板代码。

5.单独的 HTML 转换插件： HTML 到 PDF 的转换需要额外购买插件——它不包含在基本 SDK 中。

6.复杂配置：设置需要详细的对象配置（例如，HTML2PDFSettingData），具有多个属性。

C++ 传承： API 模式反映了 C++ 的起源，在现代 C# 应用程序中感觉不太自然。

福昕 PDF 与IronPDF对比

方面	福昕 PDF SDK	IronPDF
安装	手动动态链接库/私有源代码	简单的 NuGet 软件包
许可	复杂、以企业为重点	透明，适合各种尺寸
初始化	`Library.Initialize(sn, key)`	设置一次许可证密钥
错误处理	ErrorCode 枚举	.NET 标准例外情况
HTML 至 PDF	单独购买附加组件	内置 Chromium 引擎
API 风格	C++ 遗产，冗长	现代 .NET 模式
资源清理	手册 `Close()`/`Release()`	IDisposable/automatic
文档	企业文档门户	公共教程

成本效益分析

从 Foxit PDF 迁移到IronPDF可带来切实的开发优势：通过更简单的 API 降低复杂性，通过直观的方法加快开发速度，兼容现代 .NET，包括 async/await 和 LINQ 支持，采用 HTML 优先方法利用现有的 Web 技能，以及无需单独购买附加组件即可获得所有功能。当您计划在 2025 年和 2026 年采用 .NET 10 和 C# 14 时，IronPDF 为 PDF 生成提供了一个面向未来的基础。

开始之前

前提条件

.NET 环境：IronPDF支持 .NET Framework 4.6.2+、.NET Core 3.1+ 和 .NET 5/6/7/8/9+。
NuGet 访问权限：确保您可以从 NuGet 安装包。 3.许可证密钥：请从ironpdf.com获取用于生产环境的IronPDF许可证密钥。

备份您的项目

# Create a backup branch
git checkout -b pre-ironpdf-migration
git add .
git commit -m "Backup before福昕 PDF SDKtoIronPDFmigration"

# Create a backup branch
git checkout -b pre-ironpdf-migration
git add .
git commit -m "Backup before福昕 PDF SDKtoIronPDFmigration"

SHELL

识别所有福昕 PDF 使用情况

# Find all福昕 PDF SDKreferences
grep -r "foxit\|PDFDoc\|PDFPage\|Library.Initialize\|Library.Release" --include="*.cs" --include="*.csproj" .

# Find Foxit DLL references
find . -name "*.csproj" | xargs grep -l "Foxit\|fsdk"

# Find all福昕 PDF SDKreferences
grep -r "foxit\|PDFDoc\|PDFPage\|Library.Initialize\|Library.Release" --include="*.cs" --include="*.csproj" .

# Find Foxit DLL references
find . -name "*.csproj" | xargs grep -l "Foxit\|fsdk"

SHELL

文档当前功能

在迁移之前，编目：

您使用的福昕 PDF 功能（HTML 转换、注释、表单、安全性）
许可证密钥位置和初始化代码
自定义配置和设置
使用 ErrorCode 枚举的错误处理模式

快速启动迁移

步骤 1：更新 NuGet 软件包

#福昕 PDF SDKtypically requires manual removal of DLL references
# Check your .csproj for Foxit references and remove them

# Install IronPDF
dotnet add package IronPdf

#福昕 PDF SDKtypically requires manual removal of DLL references
# Check your .csproj for Foxit references and remove them

# Install IronPDF
dotnet add package IronPdf

SHELL

如果您在 .csproj 中有福昕 PDF 引用，请手动将其删除：


<Reference Include="fsdk_dotnet">
    <HintPath>..\libs\Foxit\fsdk_dotnet.dll</HintPath>
</Reference>


<Reference Include="fsdk_dotnet">
    <HintPath>..\libs\Foxit\fsdk_dotnet.dll</HintPath>
</Reference>

XML

步骤 2：更新命名空间

// Before (Foxit PDF)
using foxit;
using foxit.common;
using foxit.common.fxcrt;
using foxit.pdf;
using foxit.pdf.annots;
using foxit.addon.conversion;

// After (IronPDF)
using IronPdf;
using IronPdf.Rendering;
using IronPdf.Editing;

// Before (Foxit PDF)
using foxit;
using foxit.common;
using foxit.common.fxcrt;
using foxit.pdf;
using foxit.pdf.annots;
using foxit.addon.conversion;

// After (IronPDF)
using IronPdf;
using IronPdf.Rendering;
using IronPdf.Editing;

Imports IronPdf
Imports IronPdf.Rendering
Imports IronPdf.Editing

$vbLabelText $csharpLabel

第 3 步：初始化 IronPDF.

此次福昕 PDF 迁移中最重要的改进之一是消除了复杂的初始化和清理模式：

// Before (Foxit PDF)
string sn = "YOUR_SERIAL_NUMBER";
string key = "YOUR_LICENSE_KEY";
ErrorCode error_code = Library.Initialize(sn, key);
if (error_code != ErrorCode.e_ErrSuccess)
{
    throw new Exception("Failed to initialize Foxit PDF SDK");
}
// ... your code ...
Library.Release();  // Don't forget this!

// After (IronPDF)
IronPdf.License.LicenseKey = "YOUR-IRONPDF-LICENSE-KEY";
// That's it! No Release() needed

// Before (Foxit PDF)
string sn = "YOUR_SERIAL_NUMBER";
string key = "YOUR_LICENSE_KEY";
ErrorCode error_code = Library.Initialize(sn, key);
if (error_code != ErrorCode.e_ErrSuccess)
{
    throw new Exception("Failed to initialize Foxit PDF SDK");
}
// ... your code ...
Library.Release();  // Don't forget this!

// After (IronPDF)
IronPdf.License.LicenseKey = "YOUR-IRONPDF-LICENSE-KEY";
// That's it! No Release() needed

' Before (Foxit PDF)
Dim sn As String = "YOUR_SERIAL_NUMBER"
Dim key As String = "YOUR_LICENSE_KEY"
Dim error_code As ErrorCode = Library.Initialize(sn, key)
If error_code <> ErrorCode.e_ErrSuccess Then
    Throw New Exception("Failed to initialize Foxit PDF SDK")
End If
' ... your code ...
Library.Release()  ' Don't forget this!

' After (IronPDF)
IronPdf.License.LicenseKey = "YOUR-IRONPDF-LICENSE-KEY"
' That's it! No Release() needed

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步骤 4：基本转换模式

// Before (Foxit PDF)
Library.Initialize(sn, key);
HTML2PDFSettingData settings = new HTML2PDFSettingData();
settings.page_width = 612.0f;
settings.page_height = 792.0f;
using (HTML2PDF html2pdf = new HTML2PDF(settings))
{
    html2pdf.Convert(htmlContent, "output.pdf");
}
Library.Release();

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

// Before (Foxit PDF)
Library.Initialize(sn, key);
HTML2PDFSettingData settings = new HTML2PDFSettingData();
settings.page_width = 612.0f;
settings.page_height = 792.0f;
using (HTML2PDF html2pdf = new HTML2PDF(settings))
{
    html2pdf.Convert(htmlContent, "output.pdf");
}
Library.Release();

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

Imports FoxitPDF
Imports IronPdf

' Before (Foxit PDF)
Library.Initialize(sn, key)
Dim settings As New HTML2PDFSettingData()
settings.page_width = 612.0F
settings.page_height = 792.0F
Using html2pdf As New HTML2PDF(settings)
    html2pdf.Convert(htmlContent, "output.pdf")
End Using
Library.Release()

' After (IronPDF)
Dim renderer As New ChromePdfRenderer()
Dim pdf = renderer.RenderHtmlAsPdf(htmlContent)
pdf.SaveAs("output.pdf")

$vbLabelText $csharpLabel

完整的 API 参考

命名空间映射

福昕 PDF 命名空间	IronPDF 同等产品
`foxit`	`IronPdf`
`foxit.common`	`IronPdf`
`foxit.common.fxcrt`	不适用
`foxit.pdf`	`IronPdf`
`foxit.pdf.annots`	`IronPdf.Editing`
`foxit.addon.conversion`	`IronPdf.Rendering`

核心类映射

福昕 PDF SDK 类	IronPDF 同等产品
`Library`	不适用
`PDFDoc`	`PdfDocument`
`PDFPage`	`PdfDocument.Pages[i]`
`HTML2PDF`	`ChromePdfRenderer`
`TextPage`	`pdf.ExtractTextFromPage(i)`
`Watermark`	`TextStamper` / `ImageStamper`
`Security`	`SecuritySettings`
`Form`	`pdf.Form`
`Metadata`	`pdf.MetaData`

PDFDoc 方法

福昕 PDFDoc	IronPDF PDFDocument
`new PDFDoc(path)`	`PdfDocument.FromFile(path)`
`doc.LoadW(password)`	`PdfDocument.FromFile(path, password)`
`doc.GetPageCount()`	`pdf.PageCount`
`doc.GetPage(index)`	`pdf.Pages[index]`
`doc.SaveAs(path, flags)`	`pdf.SaveAs(path)`
`doc.Close()`	`pdf.Dispose()` 或使用语句
`doc.InsertDocument()`	`PdfDocument.Merge()`

HTML2PDF/转换

福昕 HTML2PDF	IronPDF 同等产品
`new HTML2PDFSettingData()`	`new ChromePdfRenderer()`
`settings.page_width`	`RenderingOptions.PaperSize`
`settings.page_height`	`RenderingOptions.SetCustomPaperSize()`
`html2pdf.Convert(html, path)`	`renderer.RenderHtmlAsPdf(html)`
`html2pdf.ConvertFromURL(url, path)`	`renderer.RenderUrlAsPdf(url)`

水印设置

福昕水印	IronPDF 同等产品
`new Watermark(doc, text, font, size, color)`	`new TextStamper()`
`WatermarkSettings.position`	`VerticalAlignment` + `HorizontalAlignment`
`WatermarkSettings.rotation`	`Rotation`
`WatermarkSettings.opacity`	`Opacity`
`watermark.InsertToAllPages()`	`pdf.ApplyStamp(stamper)`

代码示例

示例 1：HTML 到 PDF 的转换

之前（福昕 PDF SDK）：

// NuGet: Install-Package Foxit.SDK
using Foxit.SDK;
using Foxit.SDK.Common;
using Foxit.SDK.PDFConversion;
using System;

class Program
{
    static void Main()
    {
        Library.Initialize("sn", "key");

        HTML2PDFSettingData settingData = new HTML2PDFSettingData();
        settingData.page_width = 612.0f;
        settingData.page_height = 792.0f;
        settingData.page_mode = HTML2PDFPageMode.e_HTML2PDFPageModeSinglePage;

        using (HTML2PDF html2pdf = new HTML2PDF(settingData))
        {
            html2pdf.Convert("<html><body><h1>Hello World</h1></body></html>", "output.pdf");
        }

        Library.Release();
    }
}

// NuGet: Install-Package Foxit.SDK
using Foxit.SDK;
using Foxit.SDK.Common;
using Foxit.SDK.PDFConversion;
using System;

class Program
{
    static void Main()
    {
        Library.Initialize("sn", "key");

        HTML2PDFSettingData settingData = new HTML2PDFSettingData();
        settingData.page_width = 612.0f;
        settingData.page_height = 792.0f;
        settingData.page_mode = HTML2PDFPageMode.e_HTML2PDFPageModeSinglePage;

        using (HTML2PDF html2pdf = new HTML2PDF(settingData))
        {
            html2pdf.Convert("<html><body><h1>Hello World</h1></body></html>", "output.pdf");
        }

        Library.Release();
    }
}

Imports Foxit.SDK
Imports Foxit.SDK.Common
Imports Foxit.SDK.PDFConversion
Imports System

Class Program
    Shared Sub Main()
        Library.Initialize("sn", "key")

        Dim settingData As New HTML2PDFSettingData()
        settingData.page_width = 612.0F
        settingData.page_height = 792.0F
        settingData.page_mode = HTML2PDFPageMode.e_HTML2PDFPageModeSinglePage

        Using html2pdf As New HTML2PDF(settingData)
            html2pdf.Convert("<html><body><h1>Hello World</h1></body></html>", "output.pdf")
        End Using

        Library.Release()
    End Sub
End Class

$vbLabelText $csharpLabel

After (IronPDF)：

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

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf("<html><body><h1>Hello World</h1></body></html>");
        pdf.SaveAs("output.pdf");
    }
}

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

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf("<html><body><h1>Hello World</h1></body></html>");
        pdf.SaveAs("output.pdf");
    }
}

Imports IronPdf
Imports System

Class Program
    Shared Sub Main()
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = renderer.RenderHtmlAsPdf("<html><body><h1>Hello World</h1></body></html>")
        pdf.SaveAs("output.pdf")
    End Sub
End Class

$vbLabelText $csharpLabel

IronPDF 方法将 15 行以上的配置代码减少到仅 4 行。没有库初始化，没有显式清理，没有复杂的设置对象。有关更多 HTML 渲染选项，请参阅 HTML to PDF 文档。

示例 2：URL 到 PDF 的转换

之前（福昕 PDF SDK）：

// NuGet: Install-Package Foxit.SDK
using Foxit.SDK;
using Foxit.SDK.Common;
using Foxit.SDK.PDFConversion;
using System;

class Program
{
    static void Main()
    {
        Library.Initialize("sn", "key");

        HTML2PDFSettingData settingData = new HTML2PDFSettingData();
        settingData.page_width = 612.0f;
        settingData.page_height = 792.0f;
        settingData.page_mode = HTML2PDFPageMode.e_HTML2PDFPageModeSinglePage;

        using (HTML2PDF html2pdf = new HTML2PDF(settingData))
        {
            html2pdf.ConvertFromURL("https://www.example.com", "output.pdf");
        }

        Library.Release();
    }
}

// NuGet: Install-Package Foxit.SDK
using Foxit.SDK;
using Foxit.SDK.Common;
using Foxit.SDK.PDFConversion;
using System;

class Program
{
    static void Main()
    {
        Library.Initialize("sn", "key");

        HTML2PDFSettingData settingData = new HTML2PDFSettingData();
        settingData.page_width = 612.0f;
        settingData.page_height = 792.0f;
        settingData.page_mode = HTML2PDFPageMode.e_HTML2PDFPageModeSinglePage;

        using (HTML2PDF html2pdf = new HTML2PDF(settingData))
        {
            html2pdf.ConvertFromURL("https://www.example.com", "output.pdf");
        }

        Library.Release();
    }
}

Imports Foxit.SDK
Imports Foxit.SDK.Common
Imports Foxit.SDK.PDFConversion
Imports System

Class Program
    Shared Sub Main()
        Library.Initialize("sn", "key")

        Dim settingData As New HTML2PDFSettingData()
        settingData.page_width = 612.0F
        settingData.page_height = 792.0F
        settingData.page_mode = HTML2PDFPageMode.e_HTML2PDFPageModeSinglePage

        Using html2pdf As New HTML2PDF(settingData)
            html2pdf.ConvertFromURL("https://www.example.com", "output.pdf")
        End Using

        Library.Release()
    End Sub
End Class

$vbLabelText $csharpLabel

After (IronPDF)：

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

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

Imports IronPdf
Imports System

Class Program
    Shared Sub Main()
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = renderer.RenderUrlAsPdf("https://www.example.com")
        pdf.SaveAs("output.pdf")
    End Sub
End Class

$vbLabelText $csharpLabel

IronPDF 内置的 Chromium 引擎可自动处理 JavaScript 执行、CSS 渲染和动态内容。了解有关 URL 至 PDF 转换的更多信息。

示例 3：添加水印

之前（福昕 PDF SDK）：

// NuGet: Install-Package Foxit.SDK
using Foxit.SDK;
using Foxit.SDK.Common;
using Foxit.SDK.PDFDoc;
using System;

class Program
{
    static void Main()
    {
        Library.Initialize("sn", "key");

        using (PDFDoc doc = new PDFDoc("input.pdf"))
        {
            doc.Load("");

            Watermark watermark = new Watermark(doc, "Confidential", 
                new Font(Font.StandardID.e_StdIDHelvetica), 48.0f, 0xFF0000FF);

            WatermarkSettings settings = new WatermarkSettings();
            settings.flags = Watermark.e_WatermarkFlagASPageContents;
            settings.position = Watermark.Position.e_PosCenter;
            settings.rotation = -45.0f;
            settings.opacity = 0.5f;

            watermark.SetSettings(settings);
            watermark.InsertToAllPages();

            doc.SaveAs("output.pdf", PDFDoc.SaveFlags.e_SaveFlagNoOriginal);
        }

        Library.Release();
    }
}

// NuGet: Install-Package Foxit.SDK
using Foxit.SDK;
using Foxit.SDK.Common;
using Foxit.SDK.PDFDoc;
using System;

class Program
{
    static void Main()
    {
        Library.Initialize("sn", "key");

        using (PDFDoc doc = new PDFDoc("input.pdf"))
        {
            doc.Load("");

            Watermark watermark = new Watermark(doc, "Confidential", 
                new Font(Font.StandardID.e_StdIDHelvetica), 48.0f, 0xFF0000FF);

            WatermarkSettings settings = new WatermarkSettings();
            settings.flags = Watermark.e_WatermarkFlagASPageContents;
            settings.position = Watermark.Position.e_PosCenter;
            settings.rotation = -45.0f;
            settings.opacity = 0.5f;

            watermark.SetSettings(settings);
            watermark.InsertToAllPages();

            doc.SaveAs("output.pdf", PDFDoc.SaveFlags.e_SaveFlagNoOriginal);
        }

        Library.Release();
    }
}

Imports Foxit.SDK
Imports Foxit.SDK.Common
Imports Foxit.SDK.PDFDoc
Imports System

Class Program
    Shared Sub Main()
        Library.Initialize("sn", "key")

        Using doc As New PDFDoc("input.pdf")
            doc.Load("")

            Dim watermark As New Watermark(doc, "Confidential", 
                                           New Font(Font.StandardID.e_StdIDHelvetica), 48.0F, &HFF0000FF)

            Dim settings As New WatermarkSettings()
            settings.flags = Watermark.e_WatermarkFlagASPageContents
            settings.position = Watermark.Position.e_PosCenter
            settings.rotation = -45.0F
            settings.opacity = 0.5F

            watermark.SetSettings(settings)
            watermark.InsertToAllPages()

            doc.SaveAs("output.pdf", PDFDoc.SaveFlags.e_SaveFlagNoOriginal)
        End Using

        Library.Release()
    End Sub
End Class

$vbLabelText $csharpLabel

After (IronPDF)：

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

class Program
{
    static void Main()
    {
        var pdf = PdfDocument.FromFile("input.pdf");
        pdf.ApplyWatermark(new TextStamper()
        {
            Text = "Confidential",
            FontSize = 48,
            Opacity = 50,
            Rotation = -45,
            VerticalAlignment = VerticalAlignment.Middle,
            HorizontalAlignment = HorizontalAlignment.Center
        });
        pdf.SaveAs("output.pdf");
    }
}

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

class Program
{
    static void Main()
    {
        var pdf = PdfDocument.FromFile("input.pdf");
        pdf.ApplyWatermark(new TextStamper()
        {
            Text = "Confidential",
            FontSize = 48,
            Opacity = 50,
            Rotation = -45,
            VerticalAlignment = VerticalAlignment.Middle,
            HorizontalAlignment = HorizontalAlignment.Center
        });
        pdf.SaveAs("output.pdf");
    }
}

Imports IronPdf
Imports IronPdf.Editing
Imports System

Class Program
    Shared Sub Main()
        Dim pdf = PdfDocument.FromFile("input.pdf")
        pdf.ApplyWatermark(New TextStamper() With {
            .Text = "Confidential",
            .FontSize = 48,
            .Opacity = 50,
            .Rotation = -45,
            .VerticalAlignment = VerticalAlignment.Middle,
            .HorizontalAlignment = HorizontalAlignment.Center
        })
        pdf.SaveAs("output.pdf")
    End Sub
End Class

$vbLabelText $csharpLabel

IronPDF 的 TextStamper 提供基于属性的直观配置，而不是单独的设置对象和手动页面迭代。有关其他选项，请参阅完整的 watermarking 文档。

示例 4：URL 转 PDF，带页眉和页脚

之前（福昕 PDF SDK）：

using foxit;
using foxit.addon.conversion;

class Program
{
    static void Main()
    {
        Library.Initialize("sn", "key");

        try
        {
            HTML2PDFSettingData settings = new HTML2PDFSettingData();
            settings.page_width = 595.0f;  // A4
            settings.page_height = 842.0f;
            settings.page_margin_top = 100.0f;
            settings.page_margin_bottom = 100.0f;

            //福昕 PDF SDKhas limited header/footer support
            // Often requires post-processing or additional code

            using (HTML2PDF html2pdf = new HTML2PDF(settings))
            {
                html2pdf.ConvertFromURL("https://www.example.com", "webpage.pdf");
            }
        }
        finally
        {
            Library.Release();
        }
    }
}

using foxit;
using foxit.addon.conversion;

class Program
{
    static void Main()
    {
        Library.Initialize("sn", "key");

        try
        {
            HTML2PDFSettingData settings = new HTML2PDFSettingData();
            settings.page_width = 595.0f;  // A4
            settings.page_height = 842.0f;
            settings.page_margin_top = 100.0f;
            settings.page_margin_bottom = 100.0f;

            //福昕 PDF SDKhas limited header/footer support
            // Often requires post-processing or additional code

            using (HTML2PDF html2pdf = new HTML2PDF(settings))
            {
                html2pdf.ConvertFromURL("https://www.example.com", "webpage.pdf");
            }
        }
        finally
        {
            Library.Release();
        }
    }
}

Imports foxit
Imports foxit.addon.conversion

Class Program
    Shared Sub Main()
        Library.Initialize("sn", "key")

        Try
            Dim settings As New HTML2PDFSettingData()
            settings.page_width = 595.0F ' A4
            settings.page_height = 842.0F
            settings.page_margin_top = 100.0F
            settings.page_margin_bottom = 100.0F

            '福昕 PDF SDK has limited header/footer support
            ' Often requires post-processing or additional code

            Using html2pdf As New HTML2PDF(settings)
                html2pdf.ConvertFromURL("https://www.example.com", "webpage.pdf")
            End Using
        Finally
            Library.Release()
        End Try
    End Sub
End Class

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After (IronPDF)：

using IronPdf;

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
        renderer.RenderingOptions.PrintHtmlBackgrounds = true;
        renderer.RenderingOptions.WaitFor.RenderDelay(3000);  // Wait for JS

        // Built-in header/footer support
        renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter()
        {
            HtmlFragment = "<div style='text-align:center; font-size:12pt;'>Company Report</div>",
            DrawDividerLine = true
        };

        renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
        {
            HtmlFragment = "<div style='text-align:right; font-size:10pt;'>Page {page} of {total-pages}</div>",
            DrawDividerLine = true
        };

        var pdf = renderer.RenderUrlAsPdf("https://www.example.com");
        pdf.SaveAs("webpage.pdf");
    }
}

using IronPdf;

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
        renderer.RenderingOptions.PrintHtmlBackgrounds = true;
        renderer.RenderingOptions.WaitFor.RenderDelay(3000);  // Wait for JS

        // Built-in header/footer support
        renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter()
        {
            HtmlFragment = "<div style='text-align:center; font-size:12pt;'>Company Report</div>",
            DrawDividerLine = true
        };

        renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
        {
            HtmlFragment = "<div style='text-align:right; font-size:10pt;'>Page {page} of {total-pages}</div>",
            DrawDividerLine = true
        };

        var pdf = renderer.RenderUrlAsPdf("https://www.example.com");
        pdf.SaveAs("webpage.pdf");
    }
}

Imports IronPdf

Class Program
    Shared Sub Main()
        Dim renderer = New ChromePdfRenderer()
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4
        renderer.RenderingOptions.PrintHtmlBackgrounds = True
        renderer.RenderingOptions.WaitFor.RenderDelay(3000) ' Wait for JS

        ' Built-in header/footer support
        renderer.RenderingOptions.HtmlHeader = New HtmlHeaderFooter() With {
            .HtmlFragment = "<div style='text-align:center; font-size:12pt;'>Company Report</div>",
            .DrawDividerLine = True
        }

        renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter() With {
            .HtmlFragment = "<div style='text-align:right; font-size:10pt;'>Page {page} of {total-pages}</div>",
            .DrawDividerLine = True
        }

        Dim pdf = renderer.RenderUrlAsPdf("https://www.example.com")
        pdf.SaveAs("webpage.pdf")
    End Sub
End Class

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IronPDF 提供本地页眉和页脚支持，具有 HTML 风格和动态页码占位符。

示例 5：PDF 安全性和加密

之前（福昕 PDF SDK）：

using foxit;
using foxit.pdf;

class Program
{
    static void Main()
    {
        Library.Initialize("sn", "key");

        try
        {
            using (PDFDoc doc = new PDFDoc("input.pdf"))
            {
                doc.LoadW("");

                StdSecurityHandler securityHandler = new StdSecurityHandler();
                securityHandler.Initialize(
                    StdSecurityHandler.EncryptAlgorithm.e_CipherAES,
                    "user_password",
                    "owner_password",
                    PDFDoc.Permission.e_PermPrint | PDFDoc.Permission.e_PermModify,
                    128);

                doc.SetSecurityHandler(securityHandler);
                doc.SaveAs("encrypted.pdf", (int)PDFDoc.SaveFlags.e_SaveFlagNoOriginal);
            }
        }
        finally
        {
            Library.Release();
        }
    }
}

using foxit;
using foxit.pdf;

class Program
{
    static void Main()
    {
        Library.Initialize("sn", "key");

        try
        {
            using (PDFDoc doc = new PDFDoc("input.pdf"))
            {
                doc.LoadW("");

                StdSecurityHandler securityHandler = new StdSecurityHandler();
                securityHandler.Initialize(
                    StdSecurityHandler.EncryptAlgorithm.e_CipherAES,
                    "user_password",
                    "owner_password",
                    PDFDoc.Permission.e_PermPrint | PDFDoc.Permission.e_PermModify,
                    128);

                doc.SetSecurityHandler(securityHandler);
                doc.SaveAs("encrypted.pdf", (int)PDFDoc.SaveFlags.e_SaveFlagNoOriginal);
            }
        }
        finally
        {
            Library.Release();
        }
    }
}

Imports foxit
Imports foxit.pdf

Class Program
    Shared Sub Main()
        Library.Initialize("sn", "key")

        Try
            Using doc As New PDFDoc("input.pdf")
                doc.LoadW("")

                Dim securityHandler As New StdSecurityHandler()
                securityHandler.Initialize(StdSecurityHandler.EncryptAlgorithm.e_CipherAES,
                                           "user_password",
                                           "owner_password",
                                           PDFDoc.Permission.e_PermPrint Or PDFDoc.Permission.e_PermModify,
                                           128)

                doc.SetSecurityHandler(securityHandler)
                doc.SaveAs("encrypted.pdf", CInt(PDFDoc.SaveFlags.e_SaveFlagNoOriginal))
            End Using
        Finally
            Library.Release()
        End Try
    End Sub
End Class

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After (IronPDF)：

using IronPdf;

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

        // Set passwords
        pdf.SecuritySettings.OwnerPassword = "owner_password";
        pdf.SecuritySettings.UserPassword = "user_password";

        // Set permissions
        pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
        pdf.SecuritySettings.AllowUserEdits = IronPdf.Security.PdfEditSecurity.EditAll;
        pdf.SecuritySettings.AllowUserCopyPasteContent = true;
        pdf.SecuritySettings.AllowUserAnnotations = true;

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

using IronPdf;

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

        // Set passwords
        pdf.SecuritySettings.OwnerPassword = "owner_password";
        pdf.SecuritySettings.UserPassword = "user_password";

        // Set permissions
        pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
        pdf.SecuritySettings.AllowUserEdits = IronPdf.Security.PdfEditSecurity.EditAll;
        pdf.SecuritySettings.AllowUserCopyPasteContent = true;
        pdf.SecuritySettings.AllowUserAnnotations = true;

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

Imports IronPdf

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

        ' Set passwords
        pdf.SecuritySettings.OwnerPassword = "owner_password"
        pdf.SecuritySettings.UserPassword = "user_password"

        ' Set permissions
        pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights
        pdf.SecuritySettings.AllowUserEdits = IronPdf.Security.PdfEditSecurity.EditAll
        pdf.SecuritySettings.AllowUserCopyPasteContent = True
        pdf.SecuritySettings.AllowUserAnnotations = True

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

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性能考虑

重用 ChromePdfRenderer。

为了在 Foxit PDF 迁移过程中获得最佳性能，请重用 ChromePdfRenderer 实例——它是线程安全的：

// GOOD - Reuse renderer (thread-safe)
public class PdfService
{
    private static readonly ChromePdfRenderer _renderer = new ChromePdfRenderer();

    public byte[] Generate(string html) => _renderer.RenderHtmlAsPdf(html).BinaryData;
}

// BAD - Creates new instance each time
public byte[] GenerateBad(string html)
{
    var renderer = new ChromePdfRenderer();  // Wasteful
    return renderer.RenderHtmlAsPdf(html).BinaryData;
}

// GOOD - Reuse renderer (thread-safe)
public class PdfService
{
    private static readonly ChromePdfRenderer _renderer = new ChromePdfRenderer();

    public byte[] Generate(string html) => _renderer.RenderHtmlAsPdf(html).BinaryData;
}

// BAD - Creates new instance each time
public byte[] GenerateBad(string html)
{
    var renderer = new ChromePdfRenderer();  // Wasteful
    return renderer.RenderHtmlAsPdf(html).BinaryData;
}

Imports System

Public Class PdfService
    Private Shared ReadOnly _renderer As New ChromePdfRenderer()

    Public Function Generate(html As String) As Byte()
        Return _renderer.RenderHtmlAsPdf(html).BinaryData
    End Function

    ' BAD - Creates new instance each time
    Public Function GenerateBad(html As String) As Byte()
        Dim renderer As New ChromePdfRenderer() ' Wasteful
        Return renderer.RenderHtmlAsPdf(html).BinaryData
    End Function
End Class

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单元转换助手

Foxit PDF SDK 使用点；IronPDF使用毫米。在迁移过程中使用此辅助工具：

public static class UnitConverter
{
    public static double PointsToMm(double points) => points * 0.352778;
    public static double MmToPoints(double mm) => mm / 0.352778;
    public static double InchesToMm(double inches) => inches * 25.4;
}

// Usage: Convert Foxit's 72 points (1 inch) toIronPDFmillimeters
renderer.RenderingOptions.MarginTop = UnitConverter.PointsToMm(72); // ~25.4mm

public static class UnitConverter
{
    public static double PointsToMm(double points) => points * 0.352778;
    public static double MmToPoints(double mm) => mm / 0.352778;
    public static double InchesToMm(double inches) => inches * 25.4;
}

// Usage: Convert Foxit's 72 points (1 inch) toIronPDFmillimeters
renderer.RenderingOptions.MarginTop = UnitConverter.PointsToMm(72); // ~25.4mm

Public Module UnitConverter
    Public Function PointsToMm(points As Double) As Double
        Return points * 0.352778
    End Function

    Public Function MmToPoints(mm As Double) As Double
        Return mm / 0.352778
    End Function

    Public Function InchesToMm(inches As Double) As Double
        Return inches * 25.4
    End Function
End Module

' Usage: Convert Foxit's 72 points (1 inch) to IronPDF millimeters
renderer.RenderingOptions.MarginTop = UnitConverter.PointsToMm(72) ' ~25.4mm

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正确的资源处置

// GOOD - Using statement for automatic cleanup
using (var pdf = PdfDocument.FromFile("large.pdf"))
{
    string text = pdf.ExtractAllText();
}  // pdf is disposed automatically

// GOOD - Using statement for automatic cleanup
using (var pdf = PdfDocument.FromFile("large.pdf"))
{
    string text = pdf.ExtractAllText();
}  // pdf is disposed automatically

Imports PdfDocument

' GOOD - Using block for automatic cleanup
Using pdf = PdfDocument.FromFile("large.pdf")
    Dim text As String = pdf.ExtractAllText()
End Using ' pdf is disposed automatically

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故障排除

问题 1：Library.Initialize() 未找到

问题：IronPDF中不存在 Library.Initialize()。

解决方案：IronPDF使用了一种更简单的初始化模式：

// Foxit PDF
Library.Initialize(sn, key);

//IronPDF- just set license key once at startup
IronPdf.License.LicenseKey = "YOUR-KEY";

// Foxit PDF
Library.Initialize(sn, key);

//IronPDF- just set license key once at startup
IronPdf.License.LicenseKey = "YOUR-KEY";

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问题 2：错误代码处理

问题：代码检查 ErrorCode.e_ErrSuccess，但IronPDF没有这个。

解决方案：使用标准的.NET异常处理：

// Foxit PDF
ErrorCode err = doc.LoadW("");
if (err != ErrorCode.e_ErrSuccess) { /* handle error */ }

// IronPDF
try
{
    var pdf = PdfDocument.FromFile("input.pdf");
}
catch (IOException ex)
{
    Console.WriteLine($"Failed to load PDF: {ex.Message}");
}

// Foxit PDF
ErrorCode err = doc.LoadW("");
if (err != ErrorCode.e_ErrSuccess) { /* handle error */ }

// IronPDF
try
{
    var pdf = PdfDocument.FromFile("input.pdf");
}
catch (IOException ex)
{
    Console.WriteLine($"Failed to load PDF: {ex.Message}");
}

Imports System
Imports System.IO

' Foxit PDF
Dim err As ErrorCode = doc.LoadW("")
If err <> ErrorCode.e_ErrSuccess Then
    ' handle error
End If

' IronPDF
Try
    Dim pdf = PdfDocument.FromFile("input.pdf")
Catch ex As IOException
    Console.WriteLine($"Failed to load PDF: {ex.Message}")
End Try

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问题 3：PDFDoc.Close() 未找到

问题：IronPDF中不存在 doc.Close() 方法。

解决方案：使用 Dispose() 或 using 语句：

// Foxit PDF
doc.Close();

// IronPDF
pdf.Dispose();
// or better: wrap in using statement

// Foxit PDF
doc.Close();

// IronPDF
pdf.Dispose();
// or better: wrap in using statement

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迁移清单

迁移前

清点所有已使用的福昕 PDF SDK功能
文档许可证密钥位置
注意所有 Library.Initialize() 和 Library.Release() 调用
列出自定义设置（页面大小、边距等）
使用 ErrorCode 识别错误处理模式
将项目备份到版本控制系统
获取IronPDF许可证密钥

软件包迁移

从 .csproj 文件中移除福昕 PDF SDKDLL 引用
删除所有私有 NuGet 源配置
安装 IronPdf NuGet 包：dotnet add package IronPdf
更新命名空间导入
在启动时设置IronPDF许可证密钥

代码迁移

删除 Library.Initialize() 和 Library.Release() 调用
将 ErrorCode 检查替换为 try/catch
将 PDFDoc 替换为 PdfDocument
将 HTML2PDF 替换为 ChromePdfRenderer
将页面访问权限从 GetPage(i) 更新为 Pages[i]
将 SaveAs(path, flags) 替换为 SaveAs(path)
将 Close() 替换为 Dispose() 或使用语句
更新水印代码，使用 TextStamper
将单位从点转换为毫米

测试

验证 HTML 转 PDF 输出是否符合预期
测试 PDF 加载和文本提取
验证合并功能
检查水印外观
测试安全/加密功能
验证表单字段操作
性能测试

后迁移

删除福昕 PDF SDKDLL 文件
删除与 Foxit 相关的配置文件
更新文档
清理未使用的辅助代码

迁移。

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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从 Foxit PDF SDK 迁移到 IronPDF：(.NET指南）

为什么要从福昕 PDF SDK 迁移到 IronPDF．

福昕 PDF 的挑战

福昕 PDF 与IronPDF对比

成本效益分析

开始之前

前提条件

备份您的项目

识别所有福昕 PDF 使用情况

文档当前功能

快速启动迁移

步骤 1：更新 NuGet 软件包

步骤 2：更新命名空间

第 3 步：初始化 IronPDF.

步骤 4：基本转换模式

完整的 API 参考

命名空间映射

核心类映射

PDFDoc 方法

HTML2PDF/转换

水印设置

代码示例

示例 1：HTML 到 PDF 的转换

示例 2：URL 到 PDF 的转换

示例 3：添加水印

示例 4：URL 转 PDF，带页眉和页脚

示例 5：PDF 安全性和加密

性能考虑

重用 ChromePdfRenderer。

单元转换助手

正确的资源处置

故障排除

问题 1：Library.Initialize() 未找到

问题 2：错误代码处理

问题 3：PDFDoc.Close() 未找到

迁移清单

迁移前

软件包迁移

代码迁移

测试

后迁移

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