遷移指南

從 Foxit PDF SDK 轉移到 IronPDF：(.NET指南)

更新:2026年2月1日

從福昕 PDF SDK遷移到IronPDF可以簡化您的 .NET PDF 生成工作流程，因為它用現代化的、對開發人員友好的模式取代了複雜的、面向企業的 API。本指南提供了一個完整的、逐步的遷移路徑，可以刪除不必要的程式碼，並簡化整個程式碼庫中的 PDF 操作。

為什麼要從福昕 PDF SDK轉移到 IronPDF？

福昕 PDF 的挑戰

Foxit PDF SDK 是一個功能強大的企業級函式庫，但它也存在相當大的複雜性，可能會減慢開發速度：

1.複雜的授權系統：多種產品、SKU 和授權類型（按開發者、按伺服器、OEM 等）使得為您的專案選擇合適的選項變得困難。

2.企業定價：定價是為大型組織量身定制的，對於較小的團隊或個人開發人員來說可能難以承受。

3.手動安裝：福昕 PDF SDK需要手動 DLL 引用或私有 NuGet 來源－沒有簡單的公共 NuGet 套件可用。

4.冗長的 API：使用 Library.Initialize() 進行庫初始化、錯誤代碼檢查以及顯式的 Library.Release() 調用，會為每個操作增加大量的樣板程式碼。

5.單獨的 HTML 轉換外掛： HTML 到 PDF 的轉換需要額外購買外掛程式－它不包含在基本 SDK 中。

6.複雜配置：設定需要詳細的物件配置（例如，HTML2PDFSettingData），具有多個屬性。

C++ 傳承： API 模式反映了 C++ 的起源，在現代 C# 應用程式中感覺不太自然。

福昕 PDF 與IronPDF比較

範疇	福昕 PDF SDK	IronPDF
安裝	手動 DLL/私人饋送	簡單的 NuGet 套件
授權	複雜、以企業為重點	透明，適合各種尺寸
初始化	`Library.Initialize(sn, key)`	設定一次授權金鑰
錯誤處理	ErrorCode 枚舉	標準的 .NET 例外情況
HTML 至 PDF	另外購買附加元件	內建 Chromium 引擎
API 風格	C++ 傳承、冗贅	現代 .NET 模式
資源清理	手冊 `Close()`/`Release()`	IDisposable/automatic
文件	企業文件入口網站	公開教學。

成本效益分析

從 Foxit PDF 遷移到IronPDF可帶來切實的開發優勢：透過更簡單的 API 降低複雜性，透過直覺的方法加快開發速度，相容於現代 .NET，包括 async/await 和 LINQ 支持，採用 HTML 優先方法利用現有的 Web 技能，以及無需單獨購買附加元件即可獲得所有功能。當您計劃在 2025 年和 2026 年採用 .NET 10 和 C# 14 時，IronPDF 為 PDF 生成提供了一個面向未來的基礎。

開始之前

先決條件

.NET 環境：IronPDF支援 .NET Framework 4.6.2+、.NET Core 3.1+ 和 .NET 5/6/7/8/9+。
NuGet 存取權限：確保您可以從 NuGet 安裝套件。 3.許可證密鑰：請從ironpdf.com取得用於生產環境的IronPDF許可證密鑰。

備份您的專案

# 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

識別所有福昕 PDF 使用方式

# 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

文件目前的功能

在轉移之前，請先編目：

您使用福昕 PDF 的哪些功能（HTML 轉換、註釋、表單、安全性）
授權金鑰位置與初始化程式碼
自訂組態與設定
使用 ErrorCode 枚舉的錯誤處理模式

快速啟動遷移

步驟 1：更新 NuGet 套件

#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 Foxit PDF 引用，請手動移除它們：。


<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

步驟 2：更新命名空間

// 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

步驟 3：初始化 IronPDF

此次 Foxit PDF 移轉中最顯著的改進之一是消除了複雜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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步驟 4：基本轉換模式

// 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 參考資料

命名空間對應

福昕 PDF 命名空間	IronPDF 同等級產品
`foxit`	`IronPdf`
`foxit.common`	`IronPdf`
`foxit.common.fxcrt`	不適用
`foxit.pdf`	`IronPdf`
`foxit.pdf.annots`	`IronPdf.Editing`
`foxit.addon.conversion`	`IronPdf.Rendering`

核心類映射

福昕 PDF SDK 類別	IronPDF 同等級產品
`Library`	不適用
`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()` 或使用語句
`doc.InsertDocument()`	`PdfDocument.Merge()`

HTML2PDF/轉換

福昕 HTML2PDF	IronPDF 同等級產品
`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)`

水印設定

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

程式碼範例

範例 1：HTML 到 PDF 的轉換

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 的方法可將 15 行以上的配置代碼減少至僅 4 行。無庫初始化、無明顯清潔、無複雜設定物件。如需更多 HTML 呈現選項，請參閱 HTML to PDF 文件。

範例 2：URL 到 PDF 的轉換

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 內建的 Chromium 引擎可自動處理 JavaScript 執行、CSS 呈現和動態內容。進一步瞭解 URL 至 PDF 轉換。

範例 3：新增水印

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 提供基於屬性的直覺配置，而不是單獨的設定物件和手動頁面迭代。有關其他選項，請參閱完整的 watermarking 文件。

範例 4：將 URL 轉換為帶有頁首和頁尾的 PDF 文件

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

$vbLabelText $csharpLabel

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

$vbLabelText $csharpLabel

IronPDF 提供原生的頁首和頁尾支援，並具備 HTML 風格和動態頁碼占位符。

範例 5：PDF 安全性與加密

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

$vbLabelText $csharpLabel

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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效能考量

重複使用 ChromePdfRenderer

為了在 Foxit PDF 遷移過程中獲得最佳效能，請重複使用 ChromePdfRenderer 實例—它是執行緒安全的：

// 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

$vbLabelText $csharpLabel

單元轉換輔助工具

Foxit PDF SDK 使用點；IronPDF使用毫米。在遷移時使用此輔助工具：

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

$vbLabelText $csharpLabel

正確的資源處理方式

// 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

$vbLabelText $csharpLabel

疑難排解

問題 1：Library.Initialize() 未找到

問題：IronPDF中不存在 Library.Initialize()。

解決方案：IronPDF使用了更簡單的初始化模式：

// 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";

$vbLabelText $csharpLabel

問題 2：錯誤碼處理

問題：代碼檢查 ErrorCode.e_ErrSuccess，但IronPDF沒有此內容。

解決方案：使用標準的.NET異常處理：

// 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

$vbLabelText $csharpLabel

問題 3：PDFDoc.Close() 未找到

問題：IronPDF中不存在 doc.Close() 方法。

解：使用 Dispose() 或 using 語句：

// 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

$vbLabelText $csharpLabel

遷移清單

預遷移

清點所有已使用的福昕 PDF SDK功能
文件許可證密鑰位置
注意所有 Library.Initialize() 和 Library.Release() 調用
列出自訂設定（頁面大小、邊距等）
使用 ErrorCode 識別錯誤處理模式
將項目備份到版本控制系統
取得IronPDF許可證密鑰

套件遷移

從 .csproj 檔案移除福昕 PDF SDKDLL 引用
刪除所有私有 NuGet 來源配置
安裝 IronPdf NuGet 套件：dotnet add package IronPdf
更新命名空間匯入
啟動時設定IronPDF許可證密鑰

程式碼遷移

刪除 Library.Initialize() 和 Library.Release() 調用
將 ErrorCode 檢查替換為 try/catch
將 PDFDoc 替換為 PdfDocument
將 HTML2PDF 替換為 ChromePdfRenderer
將頁面存取權限從 GetPage(i) 更新為 Pages[i]
將 SaveAs(path, flags) 替換為 SaveAs(path)
將 Close() 替換為 Dispose() 或使用語句
更新水印代碼，使用 TextStamper
將單位從點轉換為毫米

測試

驗證 HTML 轉 PDF 輸出是否符合預期
測試 PDF 載入和文字擷取
驗證合併功能
檢查水印外觀
測試安全/加密功能
驗證表單欄位操作
效能測試

後遷移

刪除福昕 PDF SDKDLL 文件
刪除與 Foxit 相關的設定檔
更新文件
清理未使用的輔助程式碼

遷移。

Curtis Chau

立即與工程團隊聊天

技術作家

Curtis Chau 擁有卡爾頓大學計算機科學學士學位，專注於前端開發，擅長於 Node.js、TypeScript、JavaScript 和 React。Curtis 熱衷於創建直觀且美觀的用戶界面，喜歡使用現代框架並打造結構良好、視覺吸引人的手冊。

除了開發之外，Curtis 對物聯網 (IoT) 有著濃厚的興趣，探索將硬體和軟體結合的創新方式。在閒暇時間，他喜愛遊戲並構建 Discord 機器人，結合科技與創意的樂趣。

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從 Foxit PDF SDK 轉移到 IronPDF：(.NET指南)

為什麼要從福昕 PDF SDK轉移到 IronPDF？

福昕 PDF 的挑戰

福昕 PDF 與IronPDF比較

成本效益分析

開始之前

先決條件

備份您的專案

識別所有福昕 PDF 使用方式

文件目前的功能

快速啟動遷移

步驟 1：更新 NuGet 套件

步驟 2：更新命名空間

步驟 3：初始化 IronPDF

步驟 4：基本轉換模式

完整的 API 參考資料

命名空間對應

核心類映射

PDFDoc 方法

HTML2PDF/轉換

水印設定

程式碼範例

範例 1：HTML 到 PDF 的轉換

範例 2：URL 到 PDF 的轉換

範例 3：新增水印

範例 4：將 URL 轉換為帶有頁首和頁尾的 PDF 文件

範例 5：PDF 安全性與加密

效能考量

重複使用 ChromePdfRenderer

單元轉換輔助工具

正確的資源處理方式

疑難排解

問題 1：Library.Initialize() 未找到

問題 2：錯誤碼處理

問題 3：PDFDoc.Close() 未找到

遷移清單

預遷移

套件遷移

程式碼遷移

測試

後遷移

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