C# PDF程式庫

HTML 轉 PDF

using IronPdf;

// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;

// Instantiate Renderer
var renderer = new ChromePdfRenderer();

// Create a PDF from a HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");

// Export to a file or Stream
pdf.SaveAs("output.pdf");

// Advanced Example with HTML Assets
// Load external html assets: Images, CSS and JavaScript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");

using IronPdf;

// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;

// Instantiate Renderer
var renderer = new ChromePdfRenderer();

// Create a PDF from a HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");

// Export to a file or Stream
pdf.SaveAs("output.pdf");

// Advanced Example with HTML Assets
// Load external html assets: Images, CSS and JavaScript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");

PM >Install-Package IronPdf

Install-Package IronPdf

影片

如何在 .NET C# 中設置頁面方向和旋轉 | IronPDF

Curtis Chau

Updated: 2026年7月19日

從SelectPdf遷移到IronPDF，把您的PDF生成工作流程從僅支持Windows的程式庫（其預設渲染引擎是內部WebKit，且其選擇性的Blink引擎搭載Chromium 124（2024年4月））轉移到支持最新Chromium、跨平台且具備完整CSS3和JavaScript支持的程式庫。本指南提供了一個完整且逐步的遷移路徑，能夠部署到SelectPdf不支持的Linux、Docker、Azure Functions和其他雲平台。

為什麼從SelectPdf遷移到IronPDF

了解SelectPdf

SelectPdf是一個商業程式庫，設計用於使用C#將HTML內容轉換為PDF。該程式庫專為需要在應用程式中無縫整合PDF生成功能的開發者設計。 SelectPdf的強項在於其簡單的API，這使它成為PDF生成新手的吸引選擇。

然而，潛在的使用者必須要了解其嚴重的限制。根據廠商的文件，SelectPdf僅在Windows上運行，不支持Linux、macOS或Xamarin。這對於考慮基於雲的部署解決方案如Linux Azure Functions或Docker構成了一個重大的障礙。社區版限制每個PDF最多5頁並且在每一頁上新增水印，直到購買授權金鑰為止。 SelectPdf的預設渲染引擎是內部WebKit；選擇性的Blink引擎搭載Chromium 124（2024年4月），這落後於當前Chrome版本，可能造成在較新的CSS功能如CSS Grid和Flexbox gap屬性上的問題。

SelectPdf的嚴重限制

問題	影響	IronPDF解決方案
僅支持Windows	無法部署到Linux、Docker、Azure Functions	完整的跨平台支持
預設WebKit引擎；選擇的Blink引擎搭載Chromium 124（2024年4月）	預設引擎上可能無法使用較新的CSS功能	使用最新的Chromium
5頁免費版限制	每頁都有水印，直到購買授權	慷慨的試用
.NET 10僅限於Windows	無法在Linux/macOS/容器上部署	全平台支持.NET 10
雲部署受阻（非Windows）	無法使用AWS Lambda或Linux Azure Functions	原生雲支持

SelectPdf與IronPDF的比較

功能	SelectPdf	IronPDF
平台支持	僅限Windows	完整跨平台，支持10多個發行版
現代Web標準支持	預設使用WebKit引擎； Blink選擇性引擎搭載Chromium 124（2024年4月）	完整CSS3，使用當前Chromium
最大免費版本頁數限制	5頁＋每頁有水印	靈活，沒有硬性限制
定價	售價$499從單一開發者到$1599企业OEM	透明靈活的定價
.NET 10支持	支持，但僅限Windows	支持，所有平台
雲環境下的部署	僅支持Windows目標	完全支持（Windows+Linux）
CSS Grid CSS 網格布局	WebKit：有限； Blink（Chromium 124）：支持	支援
Flexbox（間隙屬性）	WebKit：不支持； Blink：支持	支援
CSS變數	WebKit：不支持； Blink：支持	支援
Docker (Linux)	不支持	官方映像
Azure Functions (Linux)	不支持	支援
AWS Lambda	不支持	支援

SelectPdf的NetCore套件針對.NET Standard 2.0目標，並被描述為相容於.NET 5到.NET 10，但僅限於Windows，這抵銷了其對於任何部署到Linux容器、AWS Lambda或基於Linux的Azure App Service開發團隊的相容性。IronPDF支持相同的.NET版本，並可在Windows、Linux、macOS和Docker上運行。

開始之前

前提條件

.NET Environment: .NET Framework 4.6.1+ or .NET Core 3.1+ / .NET 5/6/7/8/9/10+
NuGet存取： 有能力安裝NuGet套件
IronPDF授權： 從ironpdf.com獲取您的授權金鑰

NuGet包變更

# Remove SelectPdf (use Select.HtmlToPdf.NetCore on .NET Core / .NET 5+)
dotnet remove package Select.HtmlToPdf
# or: dotnet remove package Select.HtmlToPdf.NetCore

# Install IronPDF
dotnet add package IronPdf

# Remove SelectPdf (use Select.HtmlToPdf.NetCore on .NET Core / .NET 5+)
dotnet remove package Select.HtmlToPdf
# or: dotnet remove package Select.HtmlToPdf.NetCore

# Install IronPDF
dotnet add package IronPdf

SHELL

授權配置

// Add at application startup
IronPdf.License.LicenseKey = "YOUR-LICENSE-KEY";

// Add at application startup
IronPdf.License.LicenseKey = "YOUR-LICENSE-KEY";

' Add at application startup
IronPdf.License.LicenseKey = "YOUR-LICENSE-KEY"

' Add at application startup
IronPdf.License.LicenseKey = "YOUR-LICENSE-KEY"

完整API參考

名稱空間變更

// Before: SelectPdf
using SelectPdf;

// After: IronPDF
using IronPdf;
using IronPdf.Engines.Chrome;

// Before: SelectPdf
using SelectPdf;

// After: IronPDF
using IronPdf;
using IronPdf.Engines.Chrome;

' Before: SelectPdf
Imports SelectPdf

' After: IronPDF
Imports IronPdf
Imports IronPdf.Engines.Chrome

' Before: SelectPdf
Imports SelectPdf

' After: IronPDF
Imports IronPdf
Imports IronPdf.Engines.Chrome

核心API對應

SelectPdf	IronPDF	注釋
`HtmlToPdf`	`ChromePdfRenderer`	核心轉換類
`converter.ConvertHtmlString(html)`	`renderer.RenderHtmlAsPdf(html)`	HTML字串轉換
`converter.ConvertUrl(url)`	`renderer.RenderUrlAsPdf(url)`	URL轉換
`doc.Save(path)`	`pdf.SaveAs(path)`	保存到檔案
`doc.Close()`	不需要	IronPDF處理清理
`converter.Options.PdfPageSize`	`renderer.RenderingOptions.PaperSize`	紙張大小
`converter.Options.PdfPageOrientation`	`renderer.RenderingOptions.PaperOrientation`	方向
`converter.Options.MarginTop`	`renderer.RenderingOptions.MarginTop`	上邊距
`converter.Options.MarginBottom`	`renderer.RenderingOptions.MarginBottom`	下邊距
`converter.Options.MarginLeft`	`renderer.RenderingOptions.MarginLeft`	左邊距
`converter.Options.MarginRight`	`renderer.RenderingOptions.MarginRight`	右邊距
`PdfPageSize.A4`	`PdfPaperSize.A4`	A4尺寸枚舉
`PdfPageOrientation.Portrait`	`PdfPaperOrientation.Portrait`	豎向枚舉
`PdfPageOrientation.Landscape`	`PdfPaperOrientation.Landscape`	橫向枚舉
`{page_number}`	`{page}`	頁碼佔位符
`{total_pages}`	`{total-pages}`	總頁數佔位符

程式碼遷移範例

範例1：HTML字串轉PDF

之前（SelectPdf）：

// NuGet: Install-Package Select.HtmlToPdf
using SelectPdf;
using System;

class Program
{
    static void Main()
    {
        string htmlContent = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>";
        
        HtmlToPdf converter = new HtmlToPdf();
        PdfDocument doc = converter.ConvertHtmlString(htmlContent);
        doc.Save("document.pdf");
        doc.Close();
        
        Console.WriteLine("PDF generated from HTML string");
    }
}

// NuGet: Install-Package Select.HtmlToPdf
using SelectPdf;
using System;

class Program
{
    static void Main()
    {
        string htmlContent = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>";
        
        HtmlToPdf converter = new HtmlToPdf();
        PdfDocument doc = converter.ConvertHtmlString(htmlContent);
        doc.Save("document.pdf");
        doc.Close();
        
        Console.WriteLine("PDF generated from HTML string");
    }
}

' NuGet: Install-Package Select.HtmlToPdf
Imports SelectPdf
Imports System

Module Program
    Sub Main()
        Dim htmlContent As String = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>"

        Dim converter As New HtmlToPdf()
        Dim doc As PdfDocument = converter.ConvertHtmlString(htmlContent)
        doc.Save("document.pdf")
        doc.Close()

        Console.WriteLine("PDF generated from HTML string")
    End Sub
End Module

' NuGet: Install-Package Select.HtmlToPdf
Imports SelectPdf
Imports System

Module Program
    Sub Main()
        Dim htmlContent As String = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>"

        Dim converter As New HtmlToPdf()
        Dim doc As PdfDocument = converter.ConvertHtmlString(htmlContent)
        doc.Save("document.pdf")
        doc.Close()

        Console.WriteLine("PDF generated from HTML string")
    End Sub
End Module

之後（IronPDF）：

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

class Program
{
    static void Main()
    {
        string htmlContent = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>";
        
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf(htmlContent);
        pdf.SaveAs("document.pdf");
        
        Console.WriteLine("PDF generated from HTML string");
    }
}

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

class Program
{
    static void Main()
    {
        string htmlContent = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>";
        
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf(htmlContent);
        pdf.SaveAs("document.pdf");
        
        Console.WriteLine("PDF generated from HTML string");
    }
}

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports System

Module Program
    Sub Main()
        Dim htmlContent As String = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>"
        
        Dim renderer As New ChromePdfRenderer()
        Dim pdf = renderer.RenderHtmlAsPdf(htmlContent)
        pdf.SaveAs("document.pdf")
        
        Console.WriteLine("PDF generated from HTML string")
    End Sub
End Module

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports System

Module Program
    Sub Main()
        Dim htmlContent As String = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>"
        
        Dim renderer As New ChromePdfRenderer()
        Dim pdf = renderer.RenderHtmlAsPdf(htmlContent)
        pdf.SaveAs("document.pdf")
        
        Console.WriteLine("PDF generated from HTML string")
    End Sub
End Module

此範例演示了核心API的差異。 SelectPdf使用Close()來持久化和清理。

IronPDF使用SaveAs()保存。 Close()調用被消除，IronPDF自動處理資源管理。查看更多HTML到PDF文件以獲得完整的範例。

範例2：URL轉PDF轉換

之前（SelectPdf）：

// NuGet: Install-Package Select.HtmlToPdf
using SelectPdf;
using System;

class Program
{
    static void Main()
    {
        HtmlToPdf converter = new HtmlToPdf();
        PdfDocument doc = converter.ConvertUrl("https://www.example.com");
        doc.Save("output.pdf");
        doc.Close();
        
        Console.WriteLine("PDF created successfully");
    }
}

// NuGet: Install-Package Select.HtmlToPdf
using SelectPdf;
using System;

class Program
{
    static void Main()
    {
        HtmlToPdf converter = new HtmlToPdf();
        PdfDocument doc = converter.ConvertUrl("https://www.example.com");
        doc.Save("output.pdf");
        doc.Close();
        
        Console.WriteLine("PDF created successfully");
    }
}

' NuGet: Install-Package Select.HtmlToPdf
Imports SelectPdf
Imports System

Module Program
    Sub Main()
        Dim converter As New HtmlToPdf()
        Dim doc As PdfDocument = converter.ConvertUrl("https://www.example.com")
        doc.Save("output.pdf")
        doc.Close()

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

' NuGet: Install-Package Select.HtmlToPdf
Imports SelectPdf
Imports System

Module Program
    Sub Main()
        Dim converter As New HtmlToPdf()
        Dim doc As PdfDocument = converter.ConvertUrl("https://www.example.com")
        doc.Save("output.pdf")
        doc.Close()

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

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

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

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports System

Module Program
    Sub Main()
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = renderer.RenderUrlAsPdf("https://www.example.com")
        pdf.SaveAs("output.pdf")
        
        Console.WriteLine("PDF created successfully")
    End Sub
End Module

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports System

Module Program
    Sub Main()
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = renderer.RenderUrlAsPdf("https://www.example.com")
        pdf.SaveAs("output.pdf")
        
        Console.WriteLine("PDF created successfully")
    End Sub
End Module

SelectPdf的RenderUrlAsPdf()。關鍵的區別在於渲染引擎：SelectPdf預設使用內部WebKit並提供一個選擇的Blink引擎，該引擎與Chromium 124（2024年4月）一起提供，而IronPDF使用當前穩定的Chromium，支持完整CSS3和JavaScript。在我們的教程中了解更多。

範例3：自定義頁面設置和邊距

之前（SelectPdf）：

// NuGet: Install-Package Select.HtmlToPdf
using SelectPdf;
using System;

class Program
{
    static void Main()
    {
        HtmlToPdf converter = new HtmlToPdf();
        
        converter.Options.PdfPageSize = PdfPageSize.A4;
        converter.Options.PdfPageOrientation = PdfPageOrientation.Portrait;
        converter.Options.MarginTop = 20;
        converter.Options.MarginBottom = 20;
        converter.Options.MarginLeft = 20;
        converter.Options.MarginRight = 20;
        
        string html = "<html><body><h1>Custom Page Settings</h1></body></html>";
        PdfDocument doc = converter.ConvertHtmlString(html);
        doc.Save("custom-settings.pdf");
        doc.Close();
        
        Console.WriteLine("PDF with custom settings created");
    }
}

// NuGet: Install-Package Select.HtmlToPdf
using SelectPdf;
using System;

class Program
{
    static void Main()
    {
        HtmlToPdf converter = new HtmlToPdf();
        
        converter.Options.PdfPageSize = PdfPageSize.A4;
        converter.Options.PdfPageOrientation = PdfPageOrientation.Portrait;
        converter.Options.MarginTop = 20;
        converter.Options.MarginBottom = 20;
        converter.Options.MarginLeft = 20;
        converter.Options.MarginRight = 20;
        
        string html = "<html><body><h1>Custom Page Settings</h1></body></html>";
        PdfDocument doc = converter.ConvertHtmlString(html);
        doc.Save("custom-settings.pdf");
        doc.Close();
        
        Console.WriteLine("PDF with custom settings created");
    }
}

' NuGet: Install-Package Select.HtmlToPdf
Imports SelectPdf
Imports System

Module Program
    Sub Main()
        Dim converter As New HtmlToPdf()

        converter.Options.PdfPageSize = PdfPageSize.A4
        converter.Options.PdfPageOrientation = PdfPageOrientation.Portrait
        converter.Options.MarginTop = 20
        converter.Options.MarginBottom = 20
        converter.Options.MarginLeft = 20
        converter.Options.MarginRight = 20

        Dim html As String = "<html><body><h1>Custom Page Settings</h1></body></html>"
        Dim doc As PdfDocument = converter.ConvertHtmlString(html)
        doc.Save("custom-settings.pdf")
        doc.Close()

        Console.WriteLine("PDF with custom settings created")
    End Sub
End Module

' NuGet: Install-Package Select.HtmlToPdf
Imports SelectPdf
Imports System

Module Program
    Sub Main()
        Dim converter As New HtmlToPdf()

        converter.Options.PdfPageSize = PdfPageSize.A4
        converter.Options.PdfPageOrientation = PdfPageOrientation.Portrait
        converter.Options.MarginTop = 20
        converter.Options.MarginBottom = 20
        converter.Options.MarginLeft = 20
        converter.Options.MarginRight = 20

        Dim html As String = "<html><body><h1>Custom Page Settings</h1></body></html>"
        Dim doc As PdfDocument = converter.ConvertHtmlString(html)
        doc.Save("custom-settings.pdf")
        doc.Close()

        Console.WriteLine("PDF with custom settings created")
    End Sub
End Module

之後（IronPDF）：

// NuGet: Install-Package IronPdf
using IronPdf;
using IronPdf.Engines.Chrome;
using System;

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
        renderer.RenderingOptions.PaperOrientation = PdfPaperOrientation.Portrait;
        renderer.RenderingOptions.MarginTop = 20;
        renderer.RenderingOptions.MarginBottom = 20;
        renderer.RenderingOptions.MarginLeft = 20;
        renderer.RenderingOptions.MarginRight = 20;
        
        string html = "<html><body><h1>Custom Page Settings</h1></body></html>";
        var pdf = renderer.RenderHtmlAsPdf(html);
        pdf.SaveAs("custom-settings.pdf");
        
        Console.WriteLine("PDF with custom settings created");
    }
}

// NuGet: Install-Package IronPdf
using IronPdf;
using IronPdf.Engines.Chrome;
using System;

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
        renderer.RenderingOptions.PaperOrientation = PdfPaperOrientation.Portrait;
        renderer.RenderingOptions.MarginTop = 20;
        renderer.RenderingOptions.MarginBottom = 20;
        renderer.RenderingOptions.MarginLeft = 20;
        renderer.RenderingOptions.MarginRight = 20;
        
        string html = "<html><body><h1>Custom Page Settings</h1></body></html>";
        var pdf = renderer.RenderHtmlAsPdf(html);
        pdf.SaveAs("custom-settings.pdf");
        
        Console.WriteLine("PDF with custom settings created");
    }
}

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports IronPdf.Engines.Chrome
Imports System

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

        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4
        renderer.RenderingOptions.PaperOrientation = PdfPaperOrientation.Portrait
        renderer.RenderingOptions.MarginTop = 20
        renderer.RenderingOptions.MarginBottom = 20
        renderer.RenderingOptions.MarginLeft = 20
        renderer.RenderingOptions.MarginRight = 20

        Dim html As String = "<html><body><h1>Custom Page Settings</h1></body></html>"
        Dim pdf = renderer.RenderHtmlAsPdf(html)
        pdf.SaveAs("custom-settings.pdf")

        Console.WriteLine("PDF with custom settings created")
    End Sub
End Module

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports IronPdf.Engines.Chrome
Imports System

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

        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4
        renderer.RenderingOptions.PaperOrientation = PdfPaperOrientation.Portrait
        renderer.RenderingOptions.MarginTop = 20
        renderer.RenderingOptions.MarginBottom = 20
        renderer.RenderingOptions.MarginLeft = 20
        renderer.RenderingOptions.MarginRight = 20

        Dim html As String = "<html><body><h1>Custom Page Settings</h1></body></html>"
        Dim pdf = renderer.RenderHtmlAsPdf(html)
        pdf.SaveAs("custom-settings.pdf")

        Console.WriteLine("PDF with custom settings created")
    End Sub
End Module

頁面設置模式幾乎是一致的，屬性名改變如下：

converter.Options.PdfPageSize → renderer.RenderingOptions.PaperSize
converter.Options.PdfPageOrientation → renderer.RenderingOptions.PaperOrientation
PdfPageSize.A4 → PdfPaperSize.A4
PdfPageOrientation.Portrait → PdfPaperOrientation.Portrait

邊距屬性保持相同名稱和單位。

僅限Windows的問題

SelectPdf的平臺限制

儘管有任何行銷聲稱，SelectPdf明確不支持：

Linux（任何版本）
macOS
Docker容器
Azure Functions
AWS Lambda
Google Cloud Functions
任何基於ARM的系統

這是一個根本性的架構限制—SelectPdf依賴於特定於Windows的程式庫，且無法移植。

平台支持比較

平台	SelectPdf	IronPDF
Windows Server 2019+	✅	✅
Windows 10/11	✅	✅
Ubuntu 20.04+	❌	✅
Debian 10+	❌	✅
CentOS 7+	❌	✅
Alpine Linux	❌	✅
Amazon Linux 2	❌	✅
macOS 10.15+	❌	✅
Azure App Service（Linux）	❌	✅
Azure Functions	❌	✅
AWS Lambda	❌	✅
Docker（Linux）	❌	✅
Kubernetes	❌	✅

過時的渲染引擎

CSS特性支持比較

SelectPdf供應三個引擎（詳見廠商文件）：內部WebKit（預設），Blink（在v19.1中引入，與Chromium 124.0.6367.201一起提供—2024年4月發布）和Chromium/CEF。預設的WebKit引擎未跟上現代網頁標準：

CSS特性	SelectPdf（預設WebKit）	SelectPdf（Blink，Chromium 124）	IronPDF
CSS網格	⚠ 部分支持/出錯	✅	✅全面
Flexbox（基本）	✅	✅	✅
Flexbox（間隙屬性）	❌	✅	✅
CSS變數	❌	✅	✅
CSS calc()	⚠ 限制的	✅	✅
@media print	⚠ 限制的	✅	✅
@font-face	⚠ 限制的	✅	✅
Web 字體	⚠ 限制的	✅	✅
SVG	⚠ 基礎支持	✅	✅全面
CSS變換	⚠ 限制的	✅	✅
CSS動畫	❌	⚠ 部分支持	✅

遷移後的新能力

遷移到IronPDF後，您可獲得SelectPdf無法提供的功能：

跨平台部署

// ✅IronPDF- Works everywhere
using IronPdf;

// Azure App Service（Linux） - WORKS
// Docker container - WORKS
// AWS Lambda - WORKS
// GitHub Actions on ubuntu-latest - WORKS
// macOS development - WORKS

var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello</h1>");
pdf.SaveAs("output.pdf");

// ✅IronPDF- Works everywhere
using IronPdf;

// Azure App Service（Linux） - WORKS
// Docker container - WORKS
// AWS Lambda - WORKS
// GitHub Actions on ubuntu-latest - WORKS
// macOS development - WORKS

var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello</h1>");
pdf.SaveAs("output.pdf");

現代CSS支持

// ✅IronPDF- Uses latest stable Chromium
var renderer = new ChromePdfRenderer();

var html = @"
<style>
    :root { --primary: #007bff; --gap: 20px; }
    .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--gap); }
</style>
<div class='grid'>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 1</div>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 2</div>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 3</div>
</div>";

var pdf = renderer.RenderHtmlAsPdf(html);
// All modern CSS features render correctly!

// ✅IronPDF- Uses latest stable Chromium
var renderer = new ChromePdfRenderer();

var html = @"
<style>
    :root { --primary: #007bff; --gap: 20px; }
    .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--gap); }
</style>
<div class='grid'>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 1</div>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 2</div>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 3</div>
</div>";

var pdf = renderer.RenderHtmlAsPdf(html);
// All modern CSS features render correctly!

Imports IronPdf

' ✅IronPDF- Uses latest stable Chromium
Dim renderer As New ChromePdfRenderer()

Dim html As String = "
<style>
    :root { --primary: #007bff; --gap: 20px; }
    .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--gap); }
</style>
<div class='grid'>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 1</div>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 2</div>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 3</div>
</div>"

Dim pdf = renderer.RenderHtmlAsPdf(html)
' All modern CSS features render correctly!

Imports IronPdf

' ✅IronPDF- Uses latest stable Chromium
Dim renderer As New ChromePdfRenderer()

Dim html As String = "
<style>
    :root { --primary: #007bff; --gap: 20px; }
    .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--gap); }
</style>
<div class='grid'>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 1</div>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 2</div>
    <div style='background: var(--primary); color: white; padding: 1rem;'>Item 3</div>
</div>"

Dim pdf = renderer.RenderHtmlAsPdf(html)
' All modern CSS features render correctly!

不需要Close()

IronPDF自動處理資源管理：

// Option 1: Let garbage collection handle it
var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SaveAs("output.pdf");
// No Close() needed

// Option 2: Explicit disposal
using (var pdf = renderer.RenderHtmlAsPdf(html))
{
    pdf.SaveAs("output.pdf");
}

// Option 1: Let garbage collection handle it
var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SaveAs("output.pdf");
// No Close() needed

// Option 2: Explicit disposal
using (var pdf = renderer.RenderHtmlAsPdf(html))
{
    pdf.SaveAs("output.pdf");
}

' Option 1: Let garbage collection handle it
Dim pdf = renderer.RenderHtmlAsPdf(html)
pdf.SaveAs("output.pdf")
' No Close() needed

' Option 2: Explicit disposal
Using pdf = renderer.RenderHtmlAsPdf(html)
    pdf.SaveAs("output.pdf")
End Using

' Option 1: Let garbage collection handle it
Dim pdf = renderer.RenderHtmlAsPdf(html)
pdf.SaveAs("output.pdf")
' No Close() needed

' Option 2: Explicit disposal
Using pdf = renderer.RenderHtmlAsPdf(html)
    pdf.SaveAs("output.pdf")
End Using