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

如何使用 C# 將 RTF 轉換為 PDF

Curtis Chau

Updated: 2026年7月19日

為什麼從NReco PDF Generator遷移到IronPDF

NReco PDF Generator的關鍵安全問題

NReco PDF Generator 包裝了 wkhtmltopdf 二進位檔，因此它繼承了已知的安全漏洞。 wkhtmltopdf 專案的最後一個穩定版本是 0.12.6（2020 年 6 月），而上游倉庫於 2023 年 1 月 2 日存檔，因此不再有補丁：

CVE-2020-21365: 目錄遍歷／透過精心製作的 HTML （相同來源策略弱點）讀取本地檔案
CVE-2022-35583: 透過版本 0.12.6 中的注入 <iframe> 實現的伺服器端請求偽造 (SSRF)（CVSS 9.8）

其他 NReco PDF Generator 限制

**大規模授權摩擦：**非SaaS單伺服器生產部署免費； SaaS、多伺服器或再分發方案需要從 nrecosite.com 購買 $199 的企業源程式碼包。
已淘汰的渲染引擎： WebKit Qt（約 2012 年），對 CSS3/JS 支援有限：
- 無 CSS Grid 或 Flexbox
- 不支持現代JavaScript(ES6+)
- 網頁字體支援較差
- 無 CSS 變數或自訂屬性
外部二進位檔相依： 需要根據平台管理 wkhtmltopdf 二進位檔 (wkhtmltopdf.exe, wkhtmltox.dll)。
維護停滯： NReco.PdfGenerator 1.2.1 於 2023年1月8日發布，但在 nuget.org 上未有進一步的版本發布；底層的 wkhtmltopdf 引擎不再更新。
**有限的非同步支援：**同步 API 阻塞了 Web 應用程式中的執行緒。

NReco PDF Generator 與IronPDF比較

方面	NReco PDF Generator	IronPDF
渲染引擎	WebKit Qt (2012)	Chromium (當前)
安全性	多個未修補的 CVE（例如 CVE-2020-21365, CVE-2022-35583）; 引擎於 2023 年 1 月 2 日存檔	活躍的安全更新
CSS支持	CSS2.1，有限的 CSS3	完全支援 CSS3、Grid、Flexbox
JavaScript	基本的 ES5	完全支援 ES6+，async/await
依賴關係	外部 wkhtmltopdf 二進位檔	自包含
異步支援	只有同步	完全支持 async/await
Web 字體	有限	完整的 Google 字體，@font-face
授權	非SaaS單伺服器免費； $199 的企業包適用於SaaS／多伺服器	透明的商業定價
免費層級	非SaaS單伺服器授權免費	試用不需要浮水印

開始之前

前提條件

.NET Environment: .NET Framework 4.6.2+ or .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 NReco.PdfGenerator
dotnet remove package NReco.PdfGenerator

# Install IronPDF
dotnet add package IronPdf

# Remove NReco.PdfGenerator
dotnet remove package NReco.PdfGenerator

# Install IronPDF
dotnet add package IronPdf

SHELL

從您的部署中刪除 wkhtmltopdf 二進位檔：

刪除專案中的 wkhtmltopdf.exe, wkhtmltox.dll
移除任何 wkhtmltopdf 安裝腳本
刪除平台特定的二進位檔資料夾

授權配置

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

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

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

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

識別 NReco PDF Generator 使用

# Find all NReco.PdfGenerator references
grep -r "NReco.PdfGenerator\|HtmlToPdfConverter\|GeneratePdf" --include="*.cs" .

# Find all NReco.PdfGenerator references
grep -r "NReco.PdfGenerator\|HtmlToPdfConverter\|GeneratePdf" --include="*.cs" .

SHELL

完整API參考

核心類別映射

NReco PDF Generator	IronPDF
`HtmlToPdfConverter`	`ChromePdfRenderer`
`PageMargins`	個別邊距屬性
`PageOrientation`	`PdfPaperOrientation`
`PageSize`	`PdfPaperSize`

渲染方法映射

NReco PDF Generator	IronPDF
`GeneratePdf(html)`	`RenderHtmlAsPdf(html)`
`GeneratePdfFromFile(url, output)`	`RenderUrlAsPdf(url)`
`GeneratePdfFromFile(htmlPath, output)`	`RenderHtmlFileAsPdf(path)`
(不支援非同步)	`RenderHtmlAsPdfAsync(html)`
(不支援非同步)	`RenderUrlAsPdfAsync(url)`

頁面配置映射

NReco PDF Generator	IronPDF
`PageWidth = 210`	`RenderingOptions.PaperSize = PdfPaperSize.A4`
`PageHeight = 297`	`RenderingOptions.SetCustomPaperSizeinMilimeters(w, h)`
`Orientation = PageOrientation.Landscape`	`RenderingOptions.PaperOrientation = PdfPaperOrientation.Landscape`
`Size = PageSize.A4`	`RenderingOptions.PaperSize = PdfPaperSize.A4`

邊距映射

NReco PDF Generator	IronPDF
`Margins.Top = 10`	`RenderingOptions.MarginTop = 10`
`Margins.Bottom = 10`	`RenderingOptions.MarginBottom = 10`
`Margins.Left = 10`	`RenderingOptions.MarginLeft = 10`
`Margins.Right = 10`	`RenderingOptions.MarginRight = 10`
`new PageMargins { ... }`	個別屬性

頁眉/頁腳佔位符映射

NReco PDF Generator (wkhtmltopdf)	IronPDF
`[page]`	`{page}`
`[topage]`	`{total-pages}`
`[date]`	`{date}`
`[time]`	`{time}`
`[title]`	`{html-title}`

輸出處理映射

NReco PDF Generator	IronPDF
`byte[] pdfBytes = GeneratePdf(html)`	`PdfDocument pdf = RenderHtmlAsPdf(html)`
`File.WriteAllBytes(path, bytes)`	`pdf.SaveAs(path)`
`return pdfBytes`	`return pdf.BinaryData`
`new MemoryStream(pdfBytes)`	`new MemoryStream(pdf.BinaryData)`

程式碼遷移範例

範例1：基本HTML到PDF

之前（NReco PDF Generator）：

// NuGet: Install-Package NReco.PdfGenerator
using NReco.PdfGenerator;
using System.IO;

class Program
{
    static void Main()
    {
        var htmlToPdf = new HtmlToPdfConverter();
        var htmlContent = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>";
        var pdfBytes = htmlToPdf.GeneratePdf(htmlContent);
        File.WriteAllBytes("output.pdf", pdfBytes);
    }
}

// NuGet: Install-Package NReco.PdfGenerator
using NReco.PdfGenerator;
using System.IO;

class Program
{
    static void Main()
    {
        var htmlToPdf = new HtmlToPdfConverter();
        var htmlContent = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>";
        var pdfBytes = htmlToPdf.GeneratePdf(htmlContent);
        File.WriteAllBytes("output.pdf", pdfBytes);
    }
}

Imports NReco.PdfGenerator
Imports System.IO

Class Program
    Shared Sub Main()
        Dim htmlToPdf = New HtmlToPdfConverter()
        Dim htmlContent = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>"
        Dim pdfBytes = htmlToPdf.GeneratePdf(htmlContent)
        File.WriteAllBytes("output.pdf", pdfBytes)
    End Sub
End Class

Imports NReco.PdfGenerator
Imports System.IO

Class Program
    Shared Sub Main()
        Dim htmlToPdf = New HtmlToPdfConverter()
        Dim htmlContent = "<html><body><h1>Hello World</h1><p>This is a PDF document.</p></body></html>"
        Dim pdfBytes = htmlToPdf.GeneratePdf(htmlContent)
        File.WriteAllBytes("output.pdf", pdfBytes)
    End Sub
End Class

之後（IronPDF）：

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

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

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

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

Imports IronPdf
Imports System.IO

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

Imports IronPdf
Imports System.IO

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

根本的區別在於回傳型別和保存模式。 NReco PDF Generator 的 HtmlToPdfConverter.GeneratePdf() 回傳一個 byte[]，您必須手動使用 File.WriteAllBytes() 寫入磁碟。IronPDF的 ChromePdfRenderer.RenderHtmlAsPdf() 回傳一個具有內建 SaveAs() 方法的 PdfDocument 物件。

這種面向物件的方法提供了額外的好處：您可以在保存前操作 PDF（新增浮水印、合併文件、新增安全性）。如果您需要原始位元組以與現有程式碼相容，請使用 pdf.BinaryData。查看HTML到PDF文件以獲取其他渲染選項。

範例2：自訂頁面大小及邊距

之前（NReco PDF Generator）：

// NuGet: Install-Package NReco.PdfGenerator
using NReco.PdfGenerator;
using System.IO;

class Program
{
    static void Main()
    {
        var htmlToPdf = new HtmlToPdfConverter();
        htmlToPdf.PageWidth = 210;
        htmlToPdf.PageHeight = 297;
        htmlToPdf.Margins = new PageMargins { Top = 10, Bottom = 10, Left = 10, Right = 10 };
        var htmlContent = "<html><body><h1>Custom Page Size</h1><p>A4 size document with margins.</p></body></html>";
        var pdfBytes = htmlToPdf.GeneratePdf(htmlContent);
        File.WriteAllBytes("custom-size.pdf", pdfBytes);
    }
}

// NuGet: Install-Package NReco.PdfGenerator
using NReco.PdfGenerator;
using System.IO;

class Program
{
    static void Main()
    {
        var htmlToPdf = new HtmlToPdfConverter();
        htmlToPdf.PageWidth = 210;
        htmlToPdf.PageHeight = 297;
        htmlToPdf.Margins = new PageMargins { Top = 10, Bottom = 10, Left = 10, Right = 10 };
        var htmlContent = "<html><body><h1>Custom Page Size</h1><p>A4 size document with margins.</p></body></html>";
        var pdfBytes = htmlToPdf.GeneratePdf(htmlContent);
        File.WriteAllBytes("custom-size.pdf", pdfBytes);
    }
}

Imports NReco.PdfGenerator
Imports System.IO

Class Program
    Shared Sub Main()
        Dim htmlToPdf = New HtmlToPdfConverter()
        htmlToPdf.PageWidth = 210
        htmlToPdf.PageHeight = 297
        htmlToPdf.Margins = New PageMargins With {.Top = 10, .Bottom = 10, .Left = 10, .Right = 10}
        Dim htmlContent = "<html><body><h1>Custom Page Size</h1><p>A4 size document with margins.</p></body></html>"
        Dim pdfBytes = htmlToPdf.GeneratePdf(htmlContent)
        File.WriteAllBytes("custom-size.pdf", pdfBytes)
    End Sub
End Class

Imports NReco.PdfGenerator
Imports System.IO

Class Program
    Shared Sub Main()
        Dim htmlToPdf = New HtmlToPdfConverter()
        htmlToPdf.PageWidth = 210
        htmlToPdf.PageHeight = 297
        htmlToPdf.Margins = New PageMargins With {.Top = 10, .Bottom = 10, .Left = 10, .Right = 10}
        Dim htmlContent = "<html><body><h1>Custom Page Size</h1><p>A4 size document with margins.</p></body></html>"
        Dim pdfBytes = htmlToPdf.GeneratePdf(htmlContent)
        File.WriteAllBytes("custom-size.pdf", pdfBytes)
    End Sub
End Class

之後（IronPDF）：

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

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
        renderer.RenderingOptions.MarginTop = 10;
        renderer.RenderingOptions.MarginBottom = 10;
        renderer.RenderingOptions.MarginLeft = 10;
        renderer.RenderingOptions.MarginRight = 10;
        var htmlContent = "<html><body><h1>Custom Page Size</h1><p>A4 size document with margins.</p></body></html>";
        var pdf = renderer.RenderHtmlAsPdf(htmlContent);
        pdf.SaveAs("custom-size.pdf");
    }
}

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

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
        renderer.RenderingOptions.MarginTop = 10;
        renderer.RenderingOptions.MarginBottom = 10;
        renderer.RenderingOptions.MarginLeft = 10;
        renderer.RenderingOptions.MarginRight = 10;
        var htmlContent = "<html><body><h1>Custom Page Size</h1><p>A4 size document with margins.</p></body></html>";
        var pdf = renderer.RenderHtmlAsPdf(htmlContent);
        pdf.SaveAs("custom-size.pdf");
    }
}

Imports IronPdf
Imports IronPdf.Rendering

Class Program
    Shared Sub Main()
        Dim renderer = New ChromePdfRenderer()
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4
        renderer.RenderingOptions.MarginTop = 10
        renderer.RenderingOptions.MarginBottom = 10
        renderer.RenderingOptions.MarginLeft = 10
        renderer.RenderingOptions.MarginRight = 10
        Dim htmlContent = "<html><body><h1>Custom Page Size</h1><p>A4 size document with margins.</p></body></html>"
        Dim pdf = renderer.RenderHtmlAsPdf(htmlContent)
        pdf.SaveAs("custom-size.pdf")
    End Sub
End Class

Imports IronPdf
Imports IronPdf.Rendering

Class Program
    Shared Sub Main()
        Dim renderer = New ChromePdfRenderer()
        renderer.RenderingOptions.PaperSize = PdfPaperSize.A4
        renderer.RenderingOptions.MarginTop = 10
        renderer.RenderingOptions.MarginBottom = 10
        renderer.RenderingOptions.MarginLeft = 10
        renderer.RenderingOptions.MarginRight = 10
        Dim htmlContent = "<html><body><h1>Custom Page Size</h1><p>A4 size document with margins.</p></body></html>"
        Dim pdf = renderer.RenderHtmlAsPdf(htmlContent)
        pdf.SaveAs("custom-size.pdf")
    End Sub
End Class

NReco PDF Generator 使用數字維度 (PageWidth = 210, PageHeight = 297) 和一個 PageMargins 物件。IronPDF使用 PdfPaperSize 列舉（包括標準尺寸如 A4、Letter、Legal）和 RenderingOptions 物件上的單獨邊距屬性。

遷移的關鍵改變：

PageHeight → RenderingOptions.PaperSize = PdfPaperSize.A4
new PageMargins { Top = 10, ... } → Individual properties: RenderingOptions.MarginTop = 10

對列舉未涵蓋的自訂紙張大小使用 RenderingOptions.SetCustomPaperSizeinMilimeters(width, height)。了解更多頁面配置選項。

範例3：URL 至 PDF 轉換

之前（NReco PDF Generator）：

// NuGet: Install-Package NReco.PdfGenerator
using NReco.PdfGenerator;
using System.IO;

class Program
{
    static void Main()
    {
        var htmlToPdf = new HtmlToPdfConverter();
        var pdfBytes = htmlToPdf.GeneratePdfFromFile("https://www.example.com", null);
        File.WriteAllBytes("webpage.pdf", pdfBytes);
    }
}

// NuGet: Install-Package NReco.PdfGenerator
using NReco.PdfGenerator;
using System.IO;

class Program
{
    static void Main()
    {
        var htmlToPdf = new HtmlToPdfConverter();
        var pdfBytes = htmlToPdf.GeneratePdfFromFile("https://www.example.com", null);
        File.WriteAllBytes("webpage.pdf", pdfBytes);
    }
}

Imports NReco.PdfGenerator
Imports System.IO

Class Program
    Shared Sub Main()
        Dim htmlToPdf As New HtmlToPdfConverter()
        Dim pdfBytes As Byte() = htmlToPdf.GeneratePdfFromFile("https://www.example.com", Nothing)
        File.WriteAllBytes("webpage.pdf", pdfBytes)
    End Sub
End Class

Imports NReco.PdfGenerator
Imports System.IO

Class Program
    Shared Sub Main()
        Dim htmlToPdf As New HtmlToPdfConverter()
        Dim pdfBytes As Byte() = htmlToPdf.GeneratePdfFromFile("https://www.example.com", Nothing)
        File.WriteAllBytes("webpage.pdf", pdfBytes)
    End Sub
End Class

之後（IronPDF）：

// NuGet: Install-Package IronPdf
using IronPdf;

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

Imports IronPdf

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

NReco PDF Generator 使用混亂命名的 GeneratePdfFromFile() 方法同時處理本地檔案和 URL，具有可空的第二個參數。IronPDF提供專用方法：RenderUrlAsPdf() 用於 URL 和 RenderHtmlFileAsPdf() 用於本地 HTML 檔案。

IronPDF 的方法更清晰和直觀。對於非同步網頁應用程式，使用 await renderer.RenderUrlAsPdfAsync(url) 以避免阻塞執行緒—這是 NReco PDF Generator 無法做到的。

關鍵遷移注意事項

縮放值轉換

NReco PDF Generator 使用浮點數值 (0.0-2.0)，而IronPDF則使用百分比整數：

// NReco PDF Generator: Zoom = 0.9f (90%)
// IronPDF: Zoom = 90

// Conversion formula:
int ironPdfZoom = (int)(nrecoZoom * 100);

// NReco PDF Generator: Zoom = 0.9f (90%)
// IronPDF: Zoom = 90

// Conversion formula:
int ironPdfZoom = (int)(nrecoZoom * 100);

' NReco PDF Generator: Zoom = 0.9F (90%)
' IronPDF: Zoom = 90

' Conversion formula:
Dim ironPdfZoom As Integer = CInt(nrecoZoom * 100)

' NReco PDF Generator: Zoom = 0.9F (90%)
' IronPDF: Zoom = 90

' Conversion formula:
Dim ironPdfZoom As Integer = CInt(nrecoZoom * 100)

佔位符語法更新

所有頁眉/頁腳佔位符必須更新：

NReco PDF Generator	IronPDF
`[page]`	`{page}`
`[topage]`	`{total-pages}`
`[date]`	`{date}`
`[title]`	`{html-title}`

// NReco PDF Generator:
converter.PageFooterHtml = "<div>Page [page] of [topage]</div>";

// IronPDF:
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
{
    HtmlFragment = "<div>Page {page} of {total-pages}</div>",
    MaxHeight = 20
};

// NReco PDF Generator:
converter.PageFooterHtml = "<div>Page [page] of [topage]</div>";

// IronPDF:
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
{
    HtmlFragment = "<div>Page {page} of {total-pages}</div>",
    MaxHeight = 20
};

Imports NReco.PdfGenerator
Imports IronPdf

' NReco PDF Generator:
converter.PageFooterHtml = "<div>Page [page] of [topage]</div>"

' IronPDF:
renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter With {
    .HtmlFragment = "<div>Page {page} of {total-pages}</div>",
    .MaxHeight = 20
}

Imports NReco.PdfGenerator
Imports IronPdf

' NReco PDF Generator:
converter.PageFooterHtml = "<div>Page [page] of [topage]</div>"

' IronPDF:
renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter With {
    .HtmlFragment = "<div>Page {page} of {total-pages}</div>",
    .MaxHeight = 20
}

返回型別變更

NReco PDF Generator 直接回傳 byte[];IronPDF回傳 PdfDocument：

// NReco PDF Generator pattern:
byte[] pdfBytes = converter.GeneratePdf(html);
File.WriteAllBytes("output.pdf", pdfBytes);

//IronPDFpattern:
var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SaveAs("output.pdf");

// Or if you need bytes:
byte[] pdfBytes = renderer.RenderHtmlAsPdf(html).BinaryData;

// NReco PDF Generator pattern:
byte[] pdfBytes = converter.GeneratePdf(html);
File.WriteAllBytes("output.pdf", pdfBytes);

//IronPDFpattern:
var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SaveAs("output.pdf");

// Or if you need bytes:
byte[] pdfBytes = renderer.RenderHtmlAsPdf(html).BinaryData;

Imports System.IO

' NReco PDF Generator pattern:
Dim pdfBytes As Byte() = converter.GeneratePdf(html)
File.WriteAllBytes("output.pdf", pdfBytes)

' IronPDF pattern:
Dim pdf = renderer.RenderHtmlAsPdf(html)
pdf.SaveAs("output.pdf")

' Or if you need bytes:
Dim pdfBytes As Byte() = renderer.RenderHtmlAsPdf(html).BinaryData

Imports System.IO

' NReco PDF Generator pattern:
Dim pdfBytes As Byte() = converter.GeneratePdf(html)
File.WriteAllBytes("output.pdf", pdfBytes)

' IronPDF pattern:
Dim pdf = renderer.RenderHtmlAsPdf(html)
pdf.SaveAs("output.pdf")

' Or if you need bytes:
Dim pdfBytes As Byte() = renderer.RenderHtmlAsPdf(html).BinaryData

執行緒安全性和可重用性

NReco PDF Generator 通常每次呼叫建立一個新轉換器。IronPDF的 ChromePdfRenderer 是執行緒安全的並且可以重用：

// NReco PDF Generator pattern (creates new each time):
public byte[] Generate(string html)
{
    var converter = new HtmlToPdfConverter();
    return converter.GeneratePdf(html);
}

//IronPDFpattern (reuse renderer, thread-safe):
private readonly ChromePdfRenderer _renderer = new ChromePdfRenderer();

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

// NReco PDF Generator pattern (creates new each time):
public byte[] Generate(string html)
{
    var converter = new HtmlToPdfConverter();
    return converter.GeneratePdf(html);
}

//IronPDFpattern (reuse renderer, thread-safe):
private readonly ChromePdfRenderer _renderer = new ChromePdfRenderer();

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

' NReco PDF Generator pattern (creates new each time):
Public Function Generate(html As String) As Byte()
    Dim converter As New HtmlToPdfConverter()
    Return converter.GeneratePdf(html)
End Function

' IronPDF pattern (reuse renderer, thread-safe):
Private ReadOnly _renderer As New ChromePdfRenderer()

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

' NReco PDF Generator pattern (creates new each time):
Public Function Generate(html As String) As Byte()
    Dim converter As New HtmlToPdfConverter()
    Return converter.GeneratePdf(html)
End Function

' IronPDF pattern (reuse renderer, thread-safe):
Private ReadOnly _renderer As New ChromePdfRenderer()

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

非同步支持（新功能）

IronPDF 支持非同步/等待模式，而這是 NReco PDF Generator 無法提供的：

// NReco PDF Generator: No async support available

// IronPDF: Full async support
public async Task<byte[]> GenerateAsync(string html)
{
    var pdf = await _renderer.RenderHtmlAsPdfAsync(html);
    return pdf.BinaryData;
}

// NReco PDF Generator: No async support available

// IronPDF: Full async support
public async Task<byte[]> GenerateAsync(string html)
{
    var pdf = await _renderer.RenderHtmlAsPdfAsync(html);
    return pdf.BinaryData;
}

Imports System.Threading.Tasks

' NReco PDF Generator: No async support available

' IronPDF: Full async support
Public Async Function GenerateAsync(html As String) As Task(Of Byte())
    Dim pdf = Await _renderer.RenderHtmlAsPdfAsync(html)
    Return pdf.BinaryData
End Function

Imports System.Threading.Tasks

' NReco PDF Generator: No async support available

' IronPDF: Full async support
Public Async Function GenerateAsync(html As String) As Task(Of Byte())
    Dim pdf = Await _renderer.RenderHtmlAsPdfAsync(html)
    Return pdf.BinaryData
End Function

故障排除

問題 1：找不到 HtmlToPdfConverter

**問題：**IronPDF中不存在 HtmlToPdfConverter 類別。

解決方案： 使用 ChromePdfRenderer：

// NReco PDF Generator
var converter = new HtmlToPdfConverter();

// IronPDF
var renderer = new ChromePdfRenderer();

// NReco PDF Generator
var converter = new HtmlToPdfConverter();

// IronPDF
var renderer = new ChromePdfRenderer();

' NReco PDF Generator
Dim converter As New HtmlToPdfConverter()

' IronPDF
Dim renderer As New ChromePdfRenderer()

' NReco PDF Generator
Dim converter As New HtmlToPdfConverter()

' IronPDF
Dim renderer As New ChromePdfRenderer()

問題 2：GeneratePdf 返回錯誤型別

問題： 程式碼預期回傳 byte[] 但得到 PdfDocument。

解決方案： 存取 .BinaryData 屬性：

// NReco PDF Generator
byte[] pdfBytes = converter.GeneratePdf(html);

// IronPDF
byte[] pdfBytes = renderer.RenderHtmlAsPdf(html).BinaryData;

// NReco PDF Generator
byte[] pdfBytes = converter.GeneratePdf(html);

// IronPDF
byte[] pdfBytes = renderer.RenderHtmlAsPdf(html).BinaryData;

' NReco PDF Generator
Dim pdfBytes As Byte() = converter.GeneratePdf(html)

' IronPDF
Dim pdfBytes As Byte() = renderer.RenderHtmlAsPdf(html).BinaryData

' NReco PDF Generator
Dim pdfBytes As Byte() = converter.GeneratePdf(html)

' IronPDF
Dim pdfBytes As Byte() = renderer.RenderHtmlAsPdf(html).BinaryData

問題 3：找不到 PageMargins 物件

**問題：**IronPDF中不存在 PageMargins 類別。

解決方案： 使用個別邊距屬性：

// NReco PDF Generator
converter.Margins = new PageMargins { Top = 10, Bottom = 10, Left = 10, Right = 10 };

// IronPDF
renderer.RenderingOptions.MarginTop = 10;
renderer.RenderingOptions.MarginBottom = 10;
renderer.RenderingOptions.MarginLeft = 10;
renderer.RenderingOptions.MarginRight = 10;

// NReco PDF Generator
converter.Margins = new PageMargins { Top = 10, Bottom = 10, Left = 10, Right = 10 };

// IronPDF
renderer.RenderingOptions.MarginTop = 10;
renderer.RenderingOptions.MarginBottom = 10;
renderer.RenderingOptions.MarginLeft = 10;
renderer.RenderingOptions.MarginRight = 10;

' NReco PDF Generator
converter.Margins = New PageMargins With {.Top = 10, .Bottom = 10, .Left = 10, .Right = 10}

' IronPDF
renderer.RenderingOptions.MarginTop = 10
renderer.RenderingOptions.MarginBottom = 10
renderer.RenderingOptions.MarginLeft = 10
renderer.RenderingOptions.MarginRight = 10

' NReco PDF Generator
converter.Margins = New PageMargins With {.Top = 10, .Bottom = 10, .Left = 10, .Right = 10}

' IronPDF
renderer.RenderingOptions.MarginTop = 10
renderer.RenderingOptions.MarginBottom = 10
renderer.RenderingOptions.MarginLeft = 10
renderer.RenderingOptions.MarginRight = 10

問題 4：頁碼未顯示

問題： [page] 和 [topage] 佔位符無效。

解決方案： 更新為IronPDF佔位符語法：

// NReco PDF Generator
converter.PageFooterHtml = "<div>Page [page] of [topage]</div>";

// IronPDF
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
{
    HtmlFragment = "<div>Page {page} of {total-pages}</div>",
    MaxHeight = 20
};

// NReco PDF Generator
converter.PageFooterHtml = "<div>Page [page] of [topage]</div>";

// IronPDF
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
{
    HtmlFragment = "<div>Page {page} of {total-pages}</div>",
    MaxHeight = 20
};

Imports NReco.PdfGenerator
Imports IronPdf

converter.PageFooterHtml = "<div>Page [page] of [topage]</div>"

renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter With {
    .HtmlFragment = "<div>Page {page} of {total-pages}</div>",
    .MaxHeight = 20
}

Imports NReco.PdfGenerator
Imports IronPdf

converter.PageFooterHtml = "<div>Page [page] of [topage]</div>"

renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter With {
    .HtmlFragment = "<div>Page {page} of {total-pages}</div>",
    .MaxHeight = 20
}