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 C# 中渲染 Azure Blob 儲存中的圖像

Curtis Chau

Updated: 2026年7月19日

從PuppeteerSharp遷移到IronPDF可將您的PDF生成流程從具有300MB+ Chromium依賴的瀏覽器自動化工具轉換為具備自動記憶體管理的專用PDF庫。本指南提供了一個逐步遷移路徑，消除了運行時Chromium下載，解決了載入時的記憶體增長問題，並增加了全面的PDF操作能力。

為什麼從PuppeteerSharp遷移到IronPDF

了解PuppeteerSharp

PuppeteerSharp 是Google的Puppeteer的.NET移植，為C#帶來了瀏覽器自動化功能。它使用Chrome的內建列印至PDF功能生成PDF—相當於在瀏覽器中按Ctrl+P。這會產生優化以紙張列印的輸出，與您在螢幕上看到的不同。

PuppeteerSharp為網頁測試和刮取而設計，並非為文件生成而設。雖然有能力，但使用PuppeteerSharp生成PDF會帶來顯著的生產挑戰。

瀏覽器自動化問題

PuppeteerSharp是為瀏覽器自動化而設計，並不是為文件生成而設。這對於使用它生成PDF時造成了根本性問題：

首次使用前需要下載300MB+的Chromium。 PuppeteerSharp的一個顯著缺點是其龐大的部署大小，主要是由於捆綁的Chromium二進制文件。這一龐大大小會讓Docker映像膨脹並在無伺服器環境中導致冷啟動問題。
載入時報告的記憶體增長需要手動回收瀏覽器。在持續負載下，PuppeteerSharp使用者報告了跨瀏覽器實例的記憶體累積，通常需要通過人工程式回收來解決。
復雜的異步模式與瀏覽器生命周期管理。
列印至PDF輸出（相當於Ctrl+P，而不是螢幕截圖）。布局可能會重新流動，背景可能預設會被省略，輸出是為列印而分頁的，而不是匹配瀏覽器視圖的。
不支持PDF/A或PDF/UA以滿足合規要求。 PuppeteerSharp無法生成符合PDF/A（歸檔）或PDF/UA（可存取性）規範的文件。
無PDF操作 - 僅生成，無合併/拆分/編輯功能。雖然PuppeteerSharp在生成PDF方面很高效，但它缺乏進一步操作的能力，如合併、拆分、保護或編輯PDF。

PuppeteerSharp vs IronPDF比較

方面	PuppeteerSharp	IronPDF
主要目的	瀏覽器自動化	PDF生成
Chromium依賴	300MB+單獨下載	內建優化引擎
API複雜性	異步瀏覽器/頁面生命周期	同步一行程式碼
初始化	`BrowserFetcher.DownloadAsync()` + LaunchAsync	`new ChromePdfRenderer()`
記憶體管理	手動瀏覽器回收	自動
載入時記憶體	在高負載下報告增長	在持續運行下穩定
PDF/A支持	不可用	支援
PDF/UA可存取性	不可用	支援
PDF編輯	不可用	合併、拆分、加蓋、編輯
數位簽名	不可用	支援
執行緒安全	限制（根據上游指導）	全面
授權	MIT（開源）	商業授權

平台支持

程式庫	.NET Framework 4.7.2	.NET Core 3.1	.NET 6-8	.NET 10
IronPDF	全面	全面	全面	全面
PuppeteerSharp	透過netstandard2.0	全面	全面	全面

IronPDF支持現代.NET目標，這意味著它可以無阻礙相容地進入大多數現有應用程式。

開始之前

前提條件

.NET環境：.NET Framework 4.6.2+ 或.NET Core 3.1+ / .NET 5/6/7/8/9+
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 PuppeteerSharp
dotnet remove package PuppeteerSharp

# Remove downloaded Chromium binaries (~300MB recovered)
# Delete the .local-chromium folder

# Add IronPDF
dotnet add package IronPdf

# Remove PuppeteerSharp
dotnet remove package PuppeteerSharp

# Remove downloaded Chromium binaries (~300MB recovered)
# Delete the .local-chromium folder

# Add IronPDF
dotnet add package IronPdf

SHELL

IronPDF無需BrowserFetcher.DownloadAsync() - 渲染引擎自動捆綁。

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: PuppeteerSharp
using PuppeteerSharp;
using PuppeteerSharp.Media;
using System.Threading.Tasks;

// After: IronPDF
using IronPdf;
using IronPdf.Rendering;

// Before: PuppeteerSharp
using PuppeteerSharp;
using PuppeteerSharp.Media;
using System.Threading.Tasks;

// After: IronPDF
using IronPdf;
using IronPdf.Rendering;

' Before: PuppeteerSharp
Imports PuppeteerSharp
Imports PuppeteerSharp.Media
Imports System.Threading.Tasks

' After: IronPDF
Imports IronPdf
Imports IronPdf.Rendering

' Before: PuppeteerSharp
Imports PuppeteerSharp
Imports PuppeteerSharp.Media
Imports System.Threading.Tasks

' After: IronPDF
Imports IronPdf
Imports IronPdf.Rendering

核心API對應

PuppeteerSharp API	IronPDFAPI	注釋
`new BrowserFetcher().DownloadAsync()`	不需要	無瀏覽器下載
`Puppeteer.LaunchAsync(options)`	不需要	無瀏覽器管理
`browser.NewPageAsync()`	不需要	無頁面上下文
`page.GoToAsync(url)`	`renderer.RenderUrlAsPdf(url)`	直接渲染
`page.SetContentAsync(html)`	`renderer.RenderHtmlAsPdf(html)`	直接渲染
`page.PdfAsync(path)`	`pdf.SaveAs(path)`	渲染後
`await page.CloseAsync()`	不需要	自動清理
`await browser.CloseAsync()`	不需要	自動清理
`PdfOptions.Format`	`RenderingOptions.PaperSize`	紙張大小
`PdfOptions.Landscape`	`RenderingOptions.PaperOrientation`	方向
`PdfOptions.MarginOptions`	`RenderingOptions.MarginTop/Bottom/Left/Right`	個別邊距
`PdfOptions.PrintBackground`	`RenderingOptions.PrintHtmlBackgrounds`	背景列印
`PdfOptions.HeaderTemplate`	`RenderingOptions.HtmlHeader`	HTML標題
`PdfOptions.FooterTemplate`	`RenderingOptions.HtmlFooter`	HTML頁腳
`page.WaitForSelectorAsync()`	`RenderingOptions.WaitFor.HtmlElementId`	等待元素

程式碼遷移範例

範例1：基本HTML到PDF轉換

之前（PuppeteerSharp）：

// NuGet: Install-Package PuppeteerSharp
using PuppeteerSharp;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        var browserFetcher = new BrowserFetcher();
        await browserFetcher.DownloadAsync();
        
        await using var browser = await Puppeteer.LaunchAsync(new LaunchOptions
        {
            Headless = true
        });
        
        await using var page = await browser.NewPageAsync();
        await page.SetContentAsync("<h1>Hello World</h1><p>This is a PDF document.</p>");
        await page.PdfAsync("output.pdf");
    }
}

// NuGet: Install-Package PuppeteerSharp
using PuppeteerSharp;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        var browserFetcher = new BrowserFetcher();
        await browserFetcher.DownloadAsync();
        
        await using var browser = await Puppeteer.LaunchAsync(new LaunchOptions
        {
            Headless = true
        });
        
        await using var page = await browser.NewPageAsync();
        await page.SetContentAsync("<h1>Hello World</h1><p>This is a PDF document.</p>");
        await page.PdfAsync("output.pdf");
    }
}

' NuGet: Install-Package PuppeteerSharp
Imports PuppeteerSharp
Imports System.Threading.Tasks

Module Program
    Async Function Main(args As String()) As Task
        Dim browserFetcher = New BrowserFetcher()
        Await browserFetcher.DownloadAsync()

        Await Using browser = Await Puppeteer.LaunchAsync(New LaunchOptions With {
            .Headless = True
        })

            Await Using page = Await browser.NewPageAsync()
                Await page.SetContentAsync("<h1>Hello World</h1><p>This is a PDF document.</p>")
                Await page.PdfAsync("output.pdf")
            End Using
        End Using
    End Function
End Module

' NuGet: Install-Package PuppeteerSharp
Imports PuppeteerSharp
Imports System.Threading.Tasks

Module Program
    Async Function Main(args As String()) As Task
        Dim browserFetcher = New BrowserFetcher()
        Await browserFetcher.DownloadAsync()

        Await Using browser = Await Puppeteer.LaunchAsync(New LaunchOptions With {
            .Headless = True
        })

            Await Using page = Await browser.NewPageAsync()
                Await page.SetContentAsync("<h1>Hello World</h1><p>This is a PDF document.</p>")
                Await page.PdfAsync("output.pdf")
            End Using
        End Using
    End Function
End Module

之後（IronPDF）：

// NuGet: Install-Package IronPdf
using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1><p>This is a PDF document.</p>");
        pdf.SaveAs("output.pdf");
    }
}

// NuGet: Install-Package IronPdf
using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1><p>This is a PDF document.</p>");
        pdf.SaveAs("output.pdf");
    }
}

Imports IronPdf

Class Program
    Shared Sub Main(args As String())
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1><p>This is a PDF document.</p>")
        pdf.SaveAs("output.pdf")
    End Sub
End Class

Imports IronPdf

Class Program
    Shared Sub Main(args As String())
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1><p>This is a PDF document.</p>")
        pdf.SaveAs("output.pdf")
    End Sub
End Class

此範例說明基本的架構差異。 PuppeteerSharp需要六個異步操作：BrowserFetcher.DownloadAsync()（300MB+ 的Chromium下載）、await using處置。

IronPDF消除了所有這些復雜性：建立一個SaveAs()。無異步模式，無瀏覽器生命周期，無Chromium下載。 IronPDF的方法提供了更清晰的語法和與現代.NET應用程式的更好整合。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（PuppeteerSharp）：

// NuGet: Install-Package PuppeteerSharp
using PuppeteerSharp;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        var browserFetcher = new BrowserFetcher();
        await browserFetcher.DownloadAsync();
        
        await using var browser = await Puppeteer.LaunchAsync(new LaunchOptions
        {
            Headless = true
        });
        
        await using var page = await browser.NewPageAsync();
        await page.GoToAsync("https://www.example.com");
        await page.PdfAsync("webpage.pdf");
    }
}

// NuGet: Install-Package PuppeteerSharp
using PuppeteerSharp;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        var browserFetcher = new BrowserFetcher();
        await browserFetcher.DownloadAsync();
        
        await using var browser = await Puppeteer.LaunchAsync(new LaunchOptions
        {
            Headless = true
        });
        
        await using var page = await browser.NewPageAsync();
        await page.GoToAsync("https://www.example.com");
        await page.PdfAsync("webpage.pdf");
    }
}

' NuGet: Install-Package PuppeteerSharp
Imports PuppeteerSharp
Imports System.Threading.Tasks

Module Program
    Async Function Main(args As String()) As Task
        Dim browserFetcher = New BrowserFetcher()
        Await browserFetcher.DownloadAsync()

        Await Using browser = Await Puppeteer.LaunchAsync(New LaunchOptions With {
            .Headless = True
        })

            Await Using page = Await browser.NewPageAsync()
                Await page.GoToAsync("https://www.example.com")
                Await page.PdfAsync("webpage.pdf")
            End Using
        End Using
    End Function
End Module

' NuGet: Install-Package PuppeteerSharp
Imports PuppeteerSharp
Imports System.Threading.Tasks

Module Program
    Async Function Main(args As String()) As Task
        Dim browserFetcher = New BrowserFetcher()
        Await browserFetcher.DownloadAsync()

        Await Using browser = Await Puppeteer.LaunchAsync(New LaunchOptions With {
            .Headless = True
        })

            Await Using page = Await browser.NewPageAsync()
                Await page.GoToAsync("https://www.example.com")
                Await page.PdfAsync("webpage.pdf")
            End Using
        End Using
    End Function
End Module

之後（IronPDF）：

// NuGet: Install-Package IronPdf
using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderUrlAsPdf("https://www.example.com");
        pdf.SaveAs("webpage.pdf");
    }
}

// NuGet: Install-Package IronPdf
using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderUrlAsPdf("https://www.example.com");
        pdf.SaveAs("webpage.pdf");
    }
}

Imports IronPdf

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

Imports IronPdf

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

PuppeteerSharp使用PdfAsync()。 IronPDF提供了一個單一的RenderUrlAsPdf()方法，該方法在一次呼叫中處理導航和PDF生成。在我們的教程中了解更多。

範例3：具有邊距的自定義頁面設置

之前（PuppeteerSharp）：

// NuGet: Install-Package PuppeteerSharp
using PuppeteerSharp;
using PuppeteerSharp.Media;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        var browserFetcher = new BrowserFetcher();
        await browserFetcher.DownloadAsync();
        
        await using var browser = await Puppeteer.LaunchAsync(new LaunchOptions
        {
            Headless = true
        });
        
        await using var page = await browser.NewPageAsync();
        await page.SetContentAsync("<h1>Custom PDF</h1><p>With landscape orientation and margins.</p>");
        
        await page.PdfAsync("custom.pdf", new PdfOptions
        {
            Format = PaperFormat.A4,
            Landscape = true,
            MarginOptions = new MarginOptions
            {
                Top = "20mm",
                Bottom = "20mm",
                Left = "20mm",
                Right = "20mm"
            }
        });
    }
}

// NuGet: Install-Package PuppeteerSharp
using PuppeteerSharp;
using PuppeteerSharp.Media;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        var browserFetcher = new BrowserFetcher();
        await browserFetcher.DownloadAsync();
        
        await using var browser = await Puppeteer.LaunchAsync(new LaunchOptions
        {
            Headless = true
        });
        
        await using var page = await browser.NewPageAsync();
        await page.SetContentAsync("<h1>Custom PDF</h1><p>With landscape orientation and margins.</p>");
        
        await page.PdfAsync("custom.pdf", new PdfOptions
        {
            Format = PaperFormat.A4,
            Landscape = true,
            MarginOptions = new MarginOptions
            {
                Top = "20mm",
                Bottom = "20mm",
                Left = "20mm",
                Right = "20mm"
            }
        });
    }
}

' NuGet: Install-Package PuppeteerSharp
Imports PuppeteerSharp
Imports PuppeteerSharp.Media
Imports System.Threading.Tasks

Module Program
    Async Function Main(args As String()) As Task
        Dim browserFetcher = New BrowserFetcher()
        Await browserFetcher.DownloadAsync()

        Await Using browser = Await Puppeteer.LaunchAsync(New LaunchOptions With {
            .Headless = True
        })

            Await Using page = Await browser.NewPageAsync()
                Await page.SetContentAsync("<h1>Custom PDF</h1><p>With landscape orientation and margins.</p>")

                Await page.PdfAsync("custom.pdf", New PdfOptions With {
                    .Format = PaperFormat.A4,
                    .Landscape = True,
                    .MarginOptions = New MarginOptions With {
                        .Top = "20mm",
                        .Bottom = "20mm",
                        .Left = "20mm",
                        .Right = "20mm"
                    }
                })
            End Using
        End Using
    End Function
End Module

' NuGet: Install-Package PuppeteerSharp
Imports PuppeteerSharp
Imports PuppeteerSharp.Media
Imports System.Threading.Tasks

Module Program
    Async Function Main(args As String()) As Task
        Dim browserFetcher = New BrowserFetcher()
        Await browserFetcher.DownloadAsync()

        Await Using browser = Await Puppeteer.LaunchAsync(New LaunchOptions With {
            .Headless = True
        })

            Await Using page = Await browser.NewPageAsync()
                Await page.SetContentAsync("<h1>Custom PDF</h1><p>With landscape orientation and margins.</p>")

                Await page.PdfAsync("custom.pdf", New PdfOptions With {
                    .Format = PaperFormat.A4,
                    .Landscape = True,
                    .MarginOptions = New MarginOptions With {
                        .Top = "20mm",
                        .Bottom = "20mm",
                        .Left = "20mm",
                        .Right = "20mm"
                    }
                })
            End Using
        End Using
    End Function
End Module

之後（IronPDF）：

// NuGet: Install-Package IronPdf
using IronPdf;
using IronPdf.Rendering;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
        renderer.RenderingOptions.PaperOrientation = PdfPaperOrientation.Landscape;
        renderer.RenderingOptions.MarginTop = 20;
        renderer.RenderingOptions.MarginBottom = 20;
        renderer.RenderingOptions.MarginLeft = 20;
        renderer.RenderingOptions.MarginRight = 20;
        
        var pdf = renderer.RenderHtmlAsPdf("<h1>Custom PDF</h1><p>With landscape orientation and margins.</p>");
        pdf.SaveAs("custom.pdf");
    }
}

// NuGet: Install-Package IronPdf
using IronPdf;
using IronPdf.Rendering;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
        renderer.RenderingOptions.PaperOrientation = PdfPaperOrientation.Landscape;
        renderer.RenderingOptions.MarginTop = 20;
        renderer.RenderingOptions.MarginBottom = 20;
        renderer.RenderingOptions.MarginLeft = 20;
        renderer.RenderingOptions.MarginRight = 20;
        
        var pdf = renderer.RenderHtmlAsPdf("<h1>Custom PDF</h1><p>With landscape orientation and margins.</p>");
        pdf.SaveAs("custom.pdf");
    }
}

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports IronPdf.Rendering

Class Program
    Shared Sub Main(ByVal args As String())
        Dim renderer = New ChromePdfRenderer()
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4
        renderer.RenderingOptions.PaperOrientation = PdfPaperOrientation.Landscape
        renderer.RenderingOptions.MarginTop = 20
        renderer.RenderingOptions.MarginBottom = 20
        renderer.RenderingOptions.MarginLeft = 20
        renderer.RenderingOptions.MarginRight = 20

        Dim pdf = renderer.RenderHtmlAsPdf("<h1>Custom PDF</h1><p>With landscape orientation and margins.</p>")
        pdf.SaveAs("custom.pdf")
    End Sub
End Class

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports IronPdf.Rendering

Class Program
    Shared Sub Main(ByVal args As String())
        Dim renderer = New ChromePdfRenderer()
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4
        renderer.RenderingOptions.PaperOrientation = PdfPaperOrientation.Landscape
        renderer.RenderingOptions.MarginTop = 20
        renderer.RenderingOptions.MarginBottom = 20
        renderer.RenderingOptions.MarginLeft = 20
        renderer.RenderingOptions.MarginRight = 20

        Dim pdf = renderer.RenderHtmlAsPdf("<h1>Custom PDF</h1><p>With landscape orientation and margins.</p>")
        pdf.SaveAs("custom.pdf")
    End Sub
End Class

此範例展示了兩個程式庫之間的PDF選項映射。 PuppeteerSharp使用MarginOptions包含字串值 ("20mm")。 IronPDF使用RenderingOptions屬性，帶有直接紙張大小枚舉、方向枚舉和以毫米為單位的數值邊距值。

關鍵映射：

Format = PaperFormat.A4 → PaperSize = PdfPaperSize.A4
Landscape = true → PaperOrientation = PdfPaperOrientation.Landscape
MarginOptions.Top = "20mm" → MarginTop = 20 (數值毫米)

持續負載下的記憶體增長

使用者報告在持續負載下使用PuppeteerSharp發生記憶體累積，通常需要手動回收瀏覽器來緩解：

// PuppeteerSharp - memory growth typically requires periodic recycling
for (int i = 0; i < 1000; i++)
{
    var page = await browser.NewPageAsync();
    await page.SetContentAsync($"<h1>Document {i}</h1>");
    await page.PdfAsync($"doc_{i}.pdf");
    await page.CloseAsync();
}
// Recommended: await browser.CloseAsync(); and re-launch every N operations

//IronPDF- reuse a single renderer across operations
var renderer = new ChromePdfRenderer();
for (int i = 0; i < 1000; i++)
{
    var pdf = renderer.RenderHtmlAsPdf($"<h1>Document {i}</h1>");
    pdf.SaveAs($"doc_{i}.pdf");
    // Memory managed automatically
}

// PuppeteerSharp - memory growth typically requires periodic recycling
for (int i = 0; i < 1000; i++)
{
    var page = await browser.NewPageAsync();
    await page.SetContentAsync($"<h1>Document {i}</h1>");
    await page.PdfAsync($"doc_{i}.pdf");
    await page.CloseAsync();
}
// Recommended: await browser.CloseAsync(); and re-launch every N operations

//IronPDF- reuse a single renderer across operations
var renderer = new ChromePdfRenderer();
for (int i = 0; i < 1000; i++)
{
    var pdf = renderer.RenderHtmlAsPdf($"<h1>Document {i}</h1>");
    pdf.SaveAs($"doc_{i}.pdf");
    // Memory managed automatically
}

IronPDF消除了PuppeteerSharp需要的瀏覽器池基礎設施：

// Before (PuppeteerSharp - delete entire class)
public class PuppeteerBrowserPool
{
    private readonly ConcurrentBag<IBrowser> _browsers;
    private readonly SemaphoreSlim _semaphore;
    private int _operationCount;
    // ... recycling logic ...
}

// After (IronPDF - simple reuse)
public class PdfService
{
    private readonly ChromePdfRenderer _renderer = new();

    public byte[] Generate(string html)
    {
        return _renderer.RenderHtmlAsPdf(html).BinaryData;
    }
}

// Before (PuppeteerSharp - delete entire class)
public class PuppeteerBrowserPool
{
    private readonly ConcurrentBag<IBrowser> _browsers;
    private readonly SemaphoreSlim _semaphore;
    private int _operationCount;
    // ... recycling logic ...
}

// After (IronPDF - simple reuse)
public class PdfService
{
    private readonly ChromePdfRenderer _renderer = new();

    public byte[] Generate(string html)
    {
        return _renderer.RenderHtmlAsPdf(html).BinaryData;
    }
}

' Before (PuppeteerSharp - delete entire class)
Public Class PuppeteerBrowserPool
    Private ReadOnly _browsers As ConcurrentBag(Of IBrowser)
    Private ReadOnly _semaphore As SemaphoreSlim
    Private _operationCount As Integer
    ' ... recycling logic ...
End Class

' After (IronPDF - simple reuse)
Public Class PdfService
    Private ReadOnly _renderer As New ChromePdfRenderer()

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

' Before (PuppeteerSharp - delete entire class)
Public Class PuppeteerBrowserPool
    Private ReadOnly _browsers As ConcurrentBag(Of IBrowser)
    Private ReadOnly _semaphore As SemaphoreSlim
    Private _operationCount As Integer
    ' ... recycling logic ...
End Class

' After (IronPDF - simple reuse)
Public Class PdfService
    Private ReadOnly _renderer As New ChromePdfRenderer()

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

關鍵遷移注意事項

異步到同步轉換

PuppeteerSharp需要全程使用async/await； IronPDF支持同步操作：

// PuppeteerSharp: Async required
public async Task<byte[]> GeneratePdfAsync(string html)
{
    await new BrowserFetcher().DownloadAsync();
    await using var browser = await Puppeteer.LaunchAsync(...);
    await using var page = await browser.NewPageAsync();
    await page.SetContentAsync(html);
    return await page.PdfDataAsync();
}

// IronPDF: Sync default
public byte[] GeneratePdf(string html)
{
    var renderer = new ChromePdfRenderer();
    return renderer.RenderHtmlAsPdf(html).BinaryData;
}

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

// PuppeteerSharp: Async required
public async Task<byte[]> GeneratePdfAsync(string html)
{
    await new BrowserFetcher().DownloadAsync();
    await using var browser = await Puppeteer.LaunchAsync(...);
    await using var page = await browser.NewPageAsync();
    await page.SetContentAsync(html);
    return await page.PdfDataAsync();
}

// IronPDF: Sync default
public byte[] GeneratePdf(string html)
{
    var renderer = new ChromePdfRenderer();
    return renderer.RenderHtmlAsPdf(html).BinaryData;
}

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

Imports System.Threading.Tasks
Imports PuppeteerSharp

' PuppeteerSharp: Async required
Public Async Function GeneratePdfAsync(html As String) As Task(Of Byte())
    Await (New BrowserFetcher()).DownloadAsync()
    Await Using browser = Await Puppeteer.LaunchAsync(...)
        Await Using page = Await browser.NewPageAsync()
            Await page.SetContentAsync(html)
            Return Await page.PdfDataAsync()
        End Using
    End Using
End Function

' IronPDF: Sync default
Public Function GeneratePdf(html As String) As Byte()
    Dim renderer = New ChromePdfRenderer()
    Return renderer.RenderHtmlAsPdf(html).BinaryData
End Function

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

Imports System.Threading.Tasks
Imports PuppeteerSharp

' PuppeteerSharp: Async required
Public Async Function GeneratePdfAsync(html As String) As Task(Of Byte())
    Await (New BrowserFetcher()).DownloadAsync()
    Await Using browser = Await Puppeteer.LaunchAsync(...)
        Await Using page = Await browser.NewPageAsync()
            Await page.SetContentAsync(html)
            Return Await page.PdfDataAsync()
        End Using
    End Using
End Function

' IronPDF: Sync default
Public Function GeneratePdf(html As String) As Byte()
    Dim renderer = New ChromePdfRenderer()
    Return renderer.RenderHtmlAsPdf(html).BinaryData
End Function

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

邊距單位轉換

PuppeteerSharp使用字元單位； IronPDF使用數字毫米：

// PuppeteerSharp - string units
MarginOptions = new MarginOptions
{
    Top = "1in",      // 25.4mm
    Bottom = "0.75in", // 19mm
    Left = "1cm",     // 10mm
    Right = "20px"    // ~7.5mm at 96dpi
}

//IronPDF- numeric millimeters
renderer.RenderingOptions.MarginTop = 25;    // mm
renderer.RenderingOptions.MarginBottom = 19;
renderer.RenderingOptions.MarginLeft = 10;
renderer.RenderingOptions.MarginRight = 8;

// PuppeteerSharp - string units
MarginOptions = new MarginOptions
{
    Top = "1in",      // 25.4mm
    Bottom = "0.75in", // 19mm
    Left = "1cm",     // 10mm
    Right = "20px"    // ~7.5mm at 96dpi
}

//IronPDF- numeric millimeters
renderer.RenderingOptions.MarginTop = 25;    // mm
renderer.RenderingOptions.MarginBottom = 19;
renderer.RenderingOptions.MarginLeft = 10;
renderer.RenderingOptions.MarginRight = 8;

標頭/頁腳佔位符轉換

PuppeteerSharp類	IronPDF 佔位符
`<span class='pageNumber'>`	`{page}`
`<span class='totalPages'>`	`{total-pages}`
`<span class='date'>`	`{date}`
`<span class='title'>`	`{html-title}`

遷移後的新能力

遷移到IronPDF後，您將擁有PuppeteerSharp無法提供的功能：

PDF合併

var pdf1 = renderer.RenderHtmlAsPdf(html1);
var pdf2 = renderer.RenderHtmlAsPdf(html2);
var merged = PdfDocument.Merge(pdf1, pdf2);
merged.SaveAs("merged.pdf");

var pdf1 = renderer.RenderHtmlAsPdf(html1);
var pdf2 = renderer.RenderHtmlAsPdf(html2);
var merged = PdfDocument.Merge(pdf1, pdf2);
merged.SaveAs("merged.pdf");

Dim pdf1 = renderer.RenderHtmlAsPdf(html1)
Dim pdf2 = renderer.RenderHtmlAsPdf(html2)
Dim merged = PdfDocument.Merge(pdf1, pdf2)
merged.SaveAs("merged.pdf")

Dim pdf1 = renderer.RenderHtmlAsPdf(html1)
Dim pdf2 = renderer.RenderHtmlAsPdf(html2)
Dim merged = PdfDocument.Merge(pdf1, pdf2)
merged.SaveAs("merged.pdf")

水印

var watermark = new TextStamper
{
    Text = "CONFIDENTIAL",
    FontSize = 48,
    Opacity = 30,
    Rotation = -45
};
pdf.ApplyStamp(watermark);

var watermark = new TextStamper
{
    Text = "CONFIDENTIAL",
    FontSize = 48,
    Opacity = 30,
    Rotation = -45
};
pdf.ApplyStamp(watermark);

Dim watermark As New TextStamper With {
    .Text = "CONFIDENTIAL",
    .FontSize = 48,
    .Opacity = 30,
    .Rotation = -45
}
pdf.ApplyStamp(watermark)

Dim watermark As New TextStamper With {
    .Text = "CONFIDENTIAL",
    .FontSize = 48,
    .Opacity = 30,
    .Rotation = -45
}
pdf.ApplyStamp(watermark)

密碼保護

pdf.SecuritySettings.OwnerPassword = "admin";
pdf.SecuritySettings.UserPassword = "readonly";
pdf.SecuritySettings.AllowUserCopyPasteContent = false;

pdf.SecuritySettings.OwnerPassword = "admin";
pdf.SecuritySettings.UserPassword = "readonly";
pdf.SecuritySettings.AllowUserCopyPasteContent = false;

pdf.SecuritySettings.OwnerPassword = "admin"
pdf.SecuritySettings.UserPassword = "readonly"
pdf.SecuritySettings.AllowUserCopyPasteContent = False

pdf.SecuritySettings.OwnerPassword = "admin"
pdf.SecuritySettings.UserPassword = "readonly"
pdf.SecuritySettings.AllowUserCopyPasteContent = False

數位簽名

var signature = new PdfSignature("certificate.pfx", "password");
pdf.Sign(signature);

var signature = new PdfSignature("certificate.pfx", "password");
pdf.Sign(signature);

Dim signature = New PdfSignature("certificate.pfx", "password")
pdf.Sign(signature)

Dim signature = New PdfSignature("certificate.pfx", "password")
pdf.Sign(signature)

PDF/A合規性

pdf.SaveAsPdfA("archive.pdf", PdfAVersions.PdfA3b);

pdf.SaveAsPdfA("archive.pdf", PdfAVersions.PdfA3b);

pdf.SaveAsPdfA("archive.pdf", PdfAVersions.PdfA3b)

pdf.SaveAsPdfA("archive.pdf", PdfAVersions.PdfA3b)

性能比較摘要

指標	PuppeteerSharp	IronPDF	改進
第一個PDF（冷啟動）	45秒+	約20秒	快55%+
隨後的PDFs	可變	一致	可預測
記憶體使用	500MB+（增長）	約50MB（穩定）	減少90%的記憶體
磁碟空間（Chromium）	300MB+	0	消除下載
瀏覽器下載	必需的	不需要	零設定
執行緒安全	有限	全面	可靠的並發性
PDF生成時間	45秒	20秒	快55%