C# PDF库

HTML到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

视频

如何在HTML到PDF页面中处理断页

Curtis Chau

Updated: 2026年5月18日

BitMiracle Docotic PDF 是一个广受好评的 .NET PDF 库，以其 100% 的托管代码架构和广泛的 PDF 编程操作能力而闻名。然而，其模块化附加结构--需要单独的软件包来实现 HTML 到 PDF 的转换、布局功能和其他功能--增加了项目管理和许可的复杂性。本综合指南提供了从BitMiracle Docotic PDF逐步迁移到IronPDF的路径--IronPDF 是一个统一的 .NET PDF 库，内置基于 Chromium 的 HTML 渲染功能，所有功能都包含在一个 NuGet 包中。

为什么要从BitMiracle Docotic PDF迁移到 IronPDF？

虽然BitMiracle Docotic PDF提供了强大的 PDF 操作功能，但有几个因素促使开发团队寻求具有更精简架构的替代产品。

软件包架构比较

BitMiracle Docotic PDF 采用模块化附加方法，需要多个软件包才能实现全部功能：

方面	BitMiracle Docotic PDF	IronPDF
HTML-to-PDF	需要单独的插件 (HtmlToPdf)	内置核心功能
软件包结构	核心 + 多个附加组件	单个 NuGet 软件包
许可模式	按次许可	所有功能包括
API 复杂性	每个附加组件都有独立的命名空间	统一 API
HTML 引擎	Chromium （通过附加组件）	Chromium （内置）
社区规模	较小	规模更大、资源更多
文档	技术参考	广泛的教程

功能对等

这两个库都支持全面的 PDF 功能：

特征	BitMiracle Docotic PDF	IronPDF
从零开始创建 PDF	✅	✅
HTML 至 PDF	✅（需要插件）	✅（内置）
URL 至 PDF	✅（需要插件）	✅（内置）
PDF 操作	✅	✅
文本提取	✅	✅
合并/拆分	✅	✅
数字签名	✅	✅
加密	✅	✅
表格填写	✅	✅
符合 PDF/A 标准	✅	✅

方法上的主要差异

BitMiracle Docotic PDF使用基于画布的绘图和坐标定位 (canvas.DrawString(x, y, text))，而IronPDF利用HTML/CSS进行布局和定位。这代表了一种模式的转变，简化了熟悉网络技术的开发人员的内容创建。

迁移前准备

前提条件

确保您的环境符合这些要求：

.NET Framework 4.6.2+ 或 .NET Core 3.1 / .NET 5-9
Visual Studio 2019+ 或带有 C# 扩展的 VS Code
访问 NuGet 包管理器 -IronPDF许可证密钥（可在ironpdf.com免费试用）

审计BitMiracle Docotic PDF的使用情况

在解决方案目录中运行这些命令，以识别所有 Docotic.Pdf 引用：

# Find all Docotic.Pdf usages in your codebase
grep -r "using BitMiracle.Docotic" --include="*.cs" .
grep -r "PdfDocument\|PdfPage\|PdfCanvas" --include="*.cs" .

# Find NuGet package references
grep -r "Docotic.Pdf" --include="*.csproj" .

# Find all Docotic.Pdf usages in your codebase
grep -r "using BitMiracle.Docotic" --include="*.cs" .
grep -r "PdfDocument\|PdfPage\|PdfCanvas" --include="*.cs" .

# Find NuGet package references
grep -r "Docotic.Pdf" --include="*.csproj" .

SHELL

值得期待的重大变化

变更	BitMiracle Docotic PDF	IronPDF	影响
HTML 渲染	需要 HtmlToPdf 附加组件	内置	删除附加软件包
页面索引	基于0的 (`Pages[0]`)	基于0的 (`Pages[0]`)	无需改动
坐标系	左下方原点	HTML/CSS 流程	使用 CSS 进行定位
画布绘图	`PdfCanvas.DrawText()`	HTML 标记	范式转换
文本提取	`page.GetText()`	`pdf.ExtractAllText()`	方法名称更改
文档加载	`new PdfDocument(path)`	`PdfDocument.FromFile(path)`	构造函数 → 静态方法
节约	`document.Save(path)`	`pdf.SaveAs(path)`	方法名称更改
处置	`IDisposable` 模式	不要求	简化资源管理

逐步迁移过程

步骤 1：更新 NuGet 软件包

删除BitMiracle Docotic PDF软件包并安装 IronPDF：

# Remove Docotic.Pdf packages
dotnet remove package BitMiracle.Docotic.Pdf
dotnet remove package BitMiracle.Docotic.Pdf.HtmlToPdf
dotnet remove package BitMiracle.Docotic.Pdf.Layout

# Install IronPDF
dotnet add package IronPdf

# Remove Docotic.Pdf packages
dotnet remove package BitMiracle.Docotic.Pdf
dotnet remove package BitMiracle.Docotic.Pdf.HtmlToPdf
dotnet remove package BitMiracle.Docotic.Pdf.Layout

# Install IronPDF
dotnet add package IronPdf

SHELL

步骤 2：更新命名空间引用

用IronPDF替换BitMiracle Docotic PDF命名空间：

// Remove these
using BitMiracle.Docotic.Pdf;
using BitMiracle.Docotic.Pdf.Layout;
// HtmlConverter from the BitMiracle.Docotic.Pdf.HtmlToPdf NuGet package
// also lives in the BitMiracle.Docotic.Pdf namespace (no extra using needed).

// Add this
using IronPdf;

// Remove these
using BitMiracle.Docotic.Pdf;
using BitMiracle.Docotic.Pdf.Layout;
// HtmlConverter from the BitMiracle.Docotic.Pdf.HtmlToPdf NuGet package
// also lives in the BitMiracle.Docotic.Pdf namespace (no extra using needed).

// Add this
using IronPdf;

Imports IronPdf

Imports IronPdf

步骤 3：配置许可证

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

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

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

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

完整的 API 迁移参考

文档操作

任务	BitMiracle Docotic PDF	IronPDF
创建空文档	`new PdfDocument()`	`new PdfDocument()`
从文件加载	`new PdfDocument(path)`	`PdfDocument.FromFile(path)`
从流加载	`PdfDocument.Load(stream)`	`PdfDocument.FromStream(stream)`
从字节加载	`PdfDocument.Load(bytes)`	`PdfDocument.FromBinaryData(bytes)`
保存到文件	`document.Save(path)`	`pdf.SaveAs(path)`
获取页数	`document.PageCount`	`pdf.PageCount`
关闭/处置	`document.Dispose()`	不要求

HTML 到 PDF 转换

任务	BitMiracle Docotic PDF（HtmlToPdf 附加组件）	IronPDF
HTML 字符串到 PDF	`await converter.CreatePdfFromStringAsync(html)`	`renderer.RenderHtmlAsPdf(html)`
HTML 文件到 PDF	`await converter.CreatePdfAsync(filePath)`	`renderer.RenderHtmlFileAsPdf(path)`
URL 至 PDF	`await converter.CreatePdfAsync(new Uri(url))`	`renderer.RenderUrlAsPdf(url)`
设置页面大小	`options.Page.SetSize(PdfPaperSize.A4)`	`renderer.RenderingOptions.PaperSize = PdfPaperSize.A4`
设置页边距	`options.Page.MarginTop = 20` (等)	`renderer.RenderingOptions.MarginTop = 20`

合并和拆分操作

任务	BitMiracle Docotic PDF	IronPDF
合并文件	`doc1.Append("file.pdf")` (路径/流/字节)	`PdfDocument.Merge(pdf1, pdf2)`
拆分文件	将 `document.CopyPage(index)` 到新文档	`pdf.CopyPages(start, end)`

代码迁移示例

HTML 到 PDF 转换

最常见的操作展示了IronPDF带来的显著简化。

BitMiracle Docotic PDF 实现：

// NuGet: Install-Package BitMiracle.Docotic.Pdf
// NuGet: Install-Package BitMiracle.Docotic.Pdf.HtmlToPdf  (separate add-on required)
using BitMiracle.Docotic.Pdf;
using System;
using System.Threading.Tasks;

class Program
{
    static async Task Main()
    {
        // HtmlConverter is async-only and downloads Chromium on first use
        using var converter = await HtmlConverter.CreateAsync();

        string html = "<html><body><h1>Hello World</h1><p>This isHTML 至 PDFconversion.</p></body></html>";

        using var pdf = await converter.CreatePdfFromStringAsync(html);
        pdf.Save("output.pdf");

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

// NuGet: Install-Package BitMiracle.Docotic.Pdf
// NuGet: Install-Package BitMiracle.Docotic.Pdf.HtmlToPdf  (separate add-on required)
using BitMiracle.Docotic.Pdf;
using System;
using System.Threading.Tasks;

class Program
{
    static async Task Main()
    {
        // HtmlConverter is async-only and downloads Chromium on first use
        using var converter = await HtmlConverter.CreateAsync();

        string html = "<html><body><h1>Hello World</h1><p>This isHTML 至 PDFconversion.</p></body></html>";

        using var pdf = await converter.CreatePdfFromStringAsync(html);
        pdf.Save("output.pdf");

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

IronPDF 实现：

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

class Program
{
    static void Main()
    {
        var renderer = new ChromePdfRenderer();
        string html = "<html><body><h1>Hello World</h1><p>This isHTML 至 PDFconversion.</p></body></html>";
        
        var pdf = renderer.RenderHtmlAsPdf(html);
        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();
        string html = "<html><body><h1>Hello World</h1><p>This isHTML 至 PDFconversion.</p></body></html>";
        
        var pdf = renderer.RenderHtmlAsPdf(html);
        pdf.SaveAs("output.pdf");
        
        Console.WriteLine("PDF created successfully");
    }
}

IronPDF消除了对 using 语句的要求，并提供了一个专用的 ChromePdfRenderer 类，清楚地表明其基于Chromium的渲染能力。有关更多 HTML 转换选项，请参阅 HTML 转 PDF 文档。

合并多个 PDF 文件

BitMiracle Docotic PDF 实现：

// NuGet: Install-Package BitMiracle.Docotic.Pdf
using BitMiracle.Docotic.Pdf;
using System;

class Program
{
    static void Main()
    {
        using (var pdf1 = new PdfDocument("document1.pdf"))
        {
            // PdfDocument.Append accepts a file path, Stream, or byte[] —
            // not another PdfDocument instance.
            pdf1.Append("document2.pdf");
            pdf1.Save("merged.pdf");
        }

        Console.WriteLine("PDFs merged successfully");
    }
}

// NuGet: Install-Package BitMiracle.Docotic.Pdf
using BitMiracle.Docotic.Pdf;
using System;

class Program
{
    static void Main()
    {
        using (var pdf1 = new PdfDocument("document1.pdf"))
        {
            // PdfDocument.Append accepts a file path, Stream, or byte[] —
            // not another PdfDocument instance.
            pdf1.Append("document2.pdf");
            pdf1.Save("merged.pdf");
        }

        Console.WriteLine("PDFs merged successfully");
    }
}

Imports BitMiracle.Docotic.Pdf
Imports System

Class Program
    Shared Sub Main()
        Using pdf1 As New PdfDocument("document1.pdf")
            ' PdfDocument.Append accepts a file path, Stream, or byte[] —
            ' not another PdfDocument instance.
            pdf1.Append("document2.pdf")
            pdf1.Save("merged.pdf")
        End Using

        Console.WriteLine("PDFs merged successfully")
    End Sub
End Class

Imports BitMiracle.Docotic.Pdf
Imports System

Class Program
    Shared Sub Main()
        Using pdf1 As New PdfDocument("document1.pdf")
            ' PdfDocument.Append accepts a file path, Stream, or byte[] —
            ' not another PdfDocument instance.
            pdf1.Append("document2.pdf")
            pdf1.Save("merged.pdf")
        End Using

        Console.WriteLine("PDFs merged successfully")
    End Sub
End Class

IronPDF 实现：

// NuGet: Install-Package IronPdf
using IronPdf;
using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        var pdf1 = PdfDocument.FromFile("document1.pdf");
        var pdf2 = PdfDocument.FromFile("document2.pdf");
        
        var merged = PdfDocument.Merge(new List<PdfDocument> { pdf1, pdf2 });
        merged.SaveAs("merged.pdf");
        
        Console.WriteLine("PDFs merged successfully");
    }
}

// NuGet: Install-Package IronPdf
using IronPdf;
using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        var pdf1 = PdfDocument.FromFile("document1.pdf");
        var pdf2 = PdfDocument.FromFile("document2.pdf");
        
        var merged = PdfDocument.Merge(new List<PdfDocument> { pdf1, pdf2 });
        merged.SaveAs("merged.pdf");
        
        Console.WriteLine("PDFs merged successfully");
    }
}

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports System
Imports System.Collections.Generic

Module Program
    Sub Main()
        Dim pdf1 = PdfDocument.FromFile("document1.pdf")
        Dim pdf2 = PdfDocument.FromFile("document2.pdf")
        
        Dim merged = PdfDocument.Merge(New List(Of PdfDocument) From {pdf1, pdf2})
        merged.SaveAs("merged.pdf")
        
        Console.WriteLine("PDFs merged successfully")
    End Sub
End Module

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports System
Imports System.Collections.Generic

Module Program
    Sub Main()
        Dim pdf1 = PdfDocument.FromFile("document1.pdf")
        Dim pdf2 = PdfDocument.FromFile("document2.pdf")
        
        Dim merged = PdfDocument.Merge(New List(Of PdfDocument) From {pdf1, pdf2})
        merged.SaveAs("merged.pdf")
        
        Console.WriteLine("PDFs merged successfully")
    End Sub
End Module

IronPDF的静态 Merge 方法直接接受多个文档，提供了比迭代 Append 模式更清晰的API。更多选项请参阅PDF 合并文档。

文本提取

BitMiracle Docotic PDF 实现：

// NuGet: Install-Package BitMiracle.Docotic.Pdf
using BitMiracle.Docotic.Pdf;
using System;

class Program
{
    static void Main()
    {
        using (var pdf = new PdfDocument("document.pdf"))
        {
            string allText = "";
            
            foreach (var page in pdf.Pages)
            {
                allText += page.GetText();
            }
            
            Console.WriteLine("Extracted text:");
            Console.WriteLine(allText);
        }
    }
}

// NuGet: Install-Package BitMiracle.Docotic.Pdf
using BitMiracle.Docotic.Pdf;
using System;

class Program
{
    static void Main()
    {
        using (var pdf = new PdfDocument("document.pdf"))
        {
            string allText = "";
            
            foreach (var page in pdf.Pages)
            {
                allText += page.GetText();
            }
            
            Console.WriteLine("Extracted text:");
            Console.WriteLine(allText);
        }
    }
}

IronPDF 实现：

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

class Program
{
    static void Main()
    {
        var pdf = PdfDocument.FromFile("document.pdf");
        string allText = pdf.ExtractAllText();
        
        Console.WriteLine("Extracted text:");
        Console.WriteLine(allText);
    }
}

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

class Program
{
    static void Main()
    {
        var pdf = PdfDocument.FromFile("document.pdf");
        string allText = pdf.ExtractAllText();
        
        Console.WriteLine("Extracted text:");
        Console.WriteLine(allText);
    }
}

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports System

Module Program
    Sub Main()
        Dim pdf As PdfDocument = PdfDocument.FromFile("document.pdf")
        Dim allText As String = pdf.ExtractAllText()
        
        Console.WriteLine("Extracted text:")
        Console.WriteLine(allText)
    End Sub
End Module

' NuGet: Install-Package IronPdf
Imports IronPdf
Imports System

Module Program
    Sub Main()
        Dim pdf As PdfDocument = PdfDocument.FromFile("document.pdf")
        Dim allText As String = pdf.ExtractAllText()
        
        Console.WriteLine("Extracted text:")
        Console.WriteLine(allText)
    End Sub
End Module

IronPDF 将文本提取从多行循环减少到单个方法调用。有关更多提取选项，请参阅文本提取文档。

密码保护和加密

IronPDF 实现：

using IronPdf;

var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<h1>Confidential Document</h1>");

// Set security
pdf.SecuritySettings.UserPassword = "userPassword";
pdf.SecuritySettings.OwnerPassword = "ownerPassword";
pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.FullPrintRights;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;

pdf.SaveAs("protected.pdf");

using IronPdf;

var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<h1>Confidential Document</h1>");

// Set security
pdf.SecuritySettings.UserPassword = "userPassword";
pdf.SecuritySettings.OwnerPassword = "ownerPassword";
pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.FullPrintRights;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;

pdf.SaveAs("protected.pdf");

Imports IronPdf

Dim renderer As New ChromePdfRenderer()
Dim pdf = renderer.RenderHtmlAsPdf("<h1>Confidential Document</h1>")

' Set security
pdf.SecuritySettings.UserPassword = "userPassword"
pdf.SecuritySettings.OwnerPassword = "ownerPassword"
pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.FullPrintRights
pdf.SecuritySettings.AllowUserCopyPasteContent = False

pdf.SaveAs("protected.pdf")

Imports IronPdf

Dim renderer As New ChromePdfRenderer()
Dim pdf = renderer.RenderHtmlAsPdf("<h1>Confidential Document</h1>")

' Set security
pdf.SecuritySettings.UserPassword = "userPassword"
pdf.SecuritySettings.OwnerPassword = "ownerPassword"
pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.FullPrintRights
pdf.SecuritySettings.AllowUserCopyPasteContent = False

pdf.SaveAs("protected.pdf")

有关全面的安全选项，请参阅加密文档。

页眉和页脚

IronPDF 实现：

using IronPdf;

var renderer = new ChromePdfRenderer();

renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter
{
    HtmlFragment = @"
        <div style='text-align:center; font-size:12px;'>
            Company Header - Confidential
        </div>",
    DrawDividerLine = true,
    MaxHeight = 30
};

renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
{
    HtmlFragment = @"
        <div style='text-align:center; font-size:10px;'>
            Page {page} of {total-pages}
        </div>",
    DrawDividerLine = true,
    MaxHeight = 25
};

var pdf = renderer.RenderHtmlAsPdf("<h1>Document Content</h1>");
pdf.SaveAs("with_headers.pdf");

using IronPdf;

var renderer = new ChromePdfRenderer();

renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter
{
    HtmlFragment = @"
        <div style='text-align:center; font-size:12px;'>
            Company Header - Confidential
        </div>",
    DrawDividerLine = true,
    MaxHeight = 30
};

renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
{
    HtmlFragment = @"
        <div style='text-align:center; font-size:10px;'>
            Page {page} of {total-pages}
        </div>",
    DrawDividerLine = true,
    MaxHeight = 25
};

var pdf = renderer.RenderHtmlAsPdf("<h1>Document Content</h1>");
pdf.SaveAs("with_headers.pdf");

Imports IronPdf

Dim renderer As New ChromePdfRenderer()

renderer.RenderingOptions.HtmlHeader = New HtmlHeaderFooter With {
    .HtmlFragment = "
        <div style='text-align:center; font-size:12px;'>
            Company Header - Confidential
        </div>",
    .DrawDividerLine = True,
    .MaxHeight = 30
}

renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter With {
    .HtmlFragment = "
        <div style='text-align:center; font-size:10px;'>
            Page {page} of {total-pages}
        </div>",
    .DrawDividerLine = True,
    .MaxHeight = 25
}

Dim pdf = renderer.RenderHtmlAsPdf("<h1>Document Content</h1>")
pdf.SaveAs("with_headers.pdf")

Imports IronPdf

Dim renderer As New ChromePdfRenderer()

renderer.RenderingOptions.HtmlHeader = New HtmlHeaderFooter With {
    .HtmlFragment = "
        <div style='text-align:center; font-size:12px;'>
            Company Header - Confidential
        </div>",
    .DrawDividerLine = True,
    .MaxHeight = 30
}

renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter With {
    .HtmlFragment = "
        <div style='text-align:center; font-size:10px;'>
            Page {page} of {total-pages}
        </div>",
    .DrawDividerLine = True,
    .MaxHeight = 25
}

Dim pdf = renderer.RenderHtmlAsPdf("<h1>Document Content</h1>")
pdf.SaveAs("with_headers.pdf")

IronPDF支持占位符标记，如 {page} 和 {total-pages} 用于动态页码。有关更多选项，请参阅页眉和页脚文档。

关键迁移说明

画布到 HTML 的范式转变

BitMiracle Docotic PDF 基于画布的绘图方法必须通过 CSS 定位转换为 HTML：

BitMiracle Docotic PDF 模式：

var canvas = pdfPage.Canvas;
canvas.DrawString(50, 50, "Hello, World!");

var canvas = pdfPage.Canvas;
canvas.DrawString(50, 50, "Hello, World!");

Dim canvas = pdfPage.Canvas
canvas.DrawString(50, 50, "Hello, World!")

Dim canvas = pdfPage.Canvas
canvas.DrawString(50, 50, "Hello, World!")

IronPDF模式：

var html = "<div style='position:absolute; left:50px; top:50px;'>Hello, World!</div>";
var pdf = renderer.RenderHtmlAsPdf(html);

var html = "<div style='position:absolute; left:50px; top:50px;'>Hello, World!</div>";
var pdf = renderer.RenderHtmlAsPdf(html);

Dim html As String = "<div style='position:absolute; left:50px; top:50px;'>Hello, World!</div>"
Dim pdf = renderer.RenderHtmlAsPdf(html)

Dim html As String = "<div style='position:absolute; left:50px; top:50px;'>Hello, World!</div>"
Dim pdf = renderer.RenderHtmlAsPdf(html)

同页索引

两个库都使用基于0的索引（Pages[0] 是第一页）—页面访问代码不需要更改。

无需处理

IronPDF不需要 using 语句进行内存管理，简化了代码结构：

//BitMiracle Docotic PDF- disposal required
using (var pdf = new PdfDocument("input.pdf"))
{
    // operations
}

//IronPDF- disposal optional
var pdf = PdfDocument.FromFile("input.pdf");
// operations - no using statement needed

//BitMiracle Docotic PDF- disposal required
using (var pdf = new PdfDocument("input.pdf"))
{
    // operations
}

//IronPDF- disposal optional
var pdf = PdfDocument.FromFile("input.pdf");
// operations - no using statement needed

Imports BitMiracle.Docotic.Pdf

' BitMiracle Docotic PDF - disposal required
Using pdf As New PdfDocument("input.pdf")
    ' operations
End Using

' IronPDF - disposal optional
Dim pdf = PdfDocument.FromFile("input.pdf")
' operations - no using statement needed

Imports BitMiracle.Docotic.Pdf

' BitMiracle Docotic PDF - disposal required
Using pdf As New PdfDocument("input.pdf")
    ' operations
End Using

' IronPDF - disposal optional
Dim pdf = PdfDocument.FromFile("input.pdf")
' operations - no using statement needed

同步支持

BitMiracle Docotic PDF 的 HtmlToPdf 附加组件要求处处采用异步模式。IronPDF支持同步和异步方法：

// Synchronous
var pdf = renderer.RenderHtmlAsPdf(html);

// Asynchronous
var pdf = await renderer.RenderHtmlAsPdfAsync(html);

// Synchronous
var pdf = renderer.RenderHtmlAsPdf(html);

// Asynchronous
var pdf = await renderer.RenderHtmlAsPdfAsync(html);

' Synchronous
Dim pdf = renderer.RenderHtmlAsPdf(html)

' Asynchronous
Dim pdf = Await renderer.RenderHtmlAsPdfAsync(html)

' Synchronous
Dim pdf = renderer.RenderHtmlAsPdf(html)

' Asynchronous
Dim pdf = Await renderer.RenderHtmlAsPdfAsync(html)

ASP.NET Core 集成

IronPDF模式：

[ApiController]
[Route("[controller]")]
public class PdfController : ControllerBase
{
    [HttpGet("generate")]
    public IActionResult GeneratePdf()
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf("<h1>Report</h1>");

        return File(pdf.BinaryData, "application/pdf", "report.pdf");
    }

    [HttpGet("generate-async")]
    public async Task<IActionResult> GeneratePdfAsync()
    {
        var renderer = new ChromePdfRenderer();
        var pdf = await renderer.RenderHtmlAsPdfAsync("<h1>Report</h1>");

        return File(pdf.BinaryData, "application/pdf", "report.pdf");
    }
}

[ApiController]
[Route("[controller]")]
public class PdfController : ControllerBase
{
    [HttpGet("generate")]
    public IActionResult GeneratePdf()
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf("<h1>Report</h1>");

        return File(pdf.BinaryData, "application/pdf", "report.pdf");
    }

    [HttpGet("generate-async")]
    public async Task<IActionResult> GeneratePdfAsync()
    {
        var renderer = new ChromePdfRenderer();
        var pdf = await renderer.RenderHtmlAsPdfAsync("<h1>Report</h1>");

        return File(pdf.BinaryData, "application/pdf", "report.pdf");
    }
}

Imports Microsoft.AspNetCore.Mvc

<ApiController>
<Route("[controller]")>
Public Class PdfController
    Inherits ControllerBase

    <HttpGet("generate")>
    Public Function GeneratePdf() As IActionResult
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = renderer.RenderHtmlAsPdf("<h1>Report</h1>")

        Return File(pdf.BinaryData, "application/pdf", "report.pdf")
    End Function

    <HttpGet("generate-async")>
    Public Async Function GeneratePdfAsync() As Task(Of IActionResult)
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = Await renderer.RenderHtmlAsPdfAsync("<h1>Report</h1>")

        Return File(pdf.BinaryData, "application/pdf", "report.pdf")
    End Function
End Class

Imports Microsoft.AspNetCore.Mvc

<ApiController>
<Route("[controller]")>
Public Class PdfController
    Inherits ControllerBase

    <HttpGet("generate")>
    Public Function GeneratePdf() As IActionResult
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = renderer.RenderHtmlAsPdf("<h1>Report</h1>")

        Return File(pdf.BinaryData, "application/pdf", "report.pdf")
    End Function

    <HttpGet("generate-async")>
    Public Async Function GeneratePdfAsync() As Task(Of IActionResult)
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = Await renderer.RenderHtmlAsPdfAsync("<h1>Report</h1>")

        Return File(pdf.BinaryData, "application/pdf", "report.pdf")
    End Function
End Class

迁移后核对表

完成代码迁移后，请验证以下内容：

运行所有单元测试以验证 PDF 生成功能是否正常。

比较 PDF 输出质量（IronPDF 的 Chromium 引擎渲染效果可能略有不同——通常更好）
验证文本提取准确性
测试表单填写功能
如适用，验证数字签名
性能测试批量操作
在所有目标环境中进行测试
更新 CI/CD 流水线
删除 Docotic.Pdf 许可证文件

其他资源

从BitMiracle Docotic PDF迁移到IronPDF可以消除管理多个附加软件包的复杂性，同时提供相同的基于 Chromium 的 HTML 渲染功能。从基于画布的绘图过渡到 HTML/CSS 定位，利用了大多数 .NET 开发人员已经掌握的网络开发技能，从而使 PDF 生成代码更具可维护性。

请注意: Bitmiracle Docotic.Pdf是其各自所有者的注册商标。本网站与Bit Miracle无关，未获得支持或赞助。所有产品名称、徽标和品牌均为各自所有者的财产。比较仅供参考，反映撰写时公开可用的信息。