视频

如何从PDF中提取嵌入文本和图像

已更新:2026年7月19日

Api2pdf 提供基于云的 PDF 生成服务，但将敏感文档发送到外部服务器可能会导致安全风险、合规性问题以及持续的成本，这些成本会随着时间的推移而累积。本指南详细介绍了从Api2pdf迁移到IronPDF的路径。IronPDF 是一个原生 .NET PDF 库，它完全在您自己的基础设施上处理文档，消除了数据传输方面的顾虑，并将每次转换的成本转化为一次性投资。

为什么考虑从 API2PDF 迁移？

虽然Api2pdf提供了便捷的基于云的 PDF 生成功能，但多种因素促使开发团队寻求本地部署的替代方案来满足其 PDF 生成需求。

安全和合规问题

Api2pdf 是一项基于云的服务，您的敏感 HTML 和文档将被发送到第三方服务器进行处理。这给处理受监管数据的组织带来了极大的困扰。

风险	Api2pdf	IronPDF
数据传输	所有发送到外部服务器的内容	在您的基础架构上进行本地处理
GDPR 合规性	数据跨辖区	数据永远不会离开您的环境
HIPAA 合规性	外部传输的 PHI	将 PHI 保留在您的系统中
SOC 2 SOC 2	第三方依赖性	对数据处理的完全控制
PCI DSS	可能暴露的银行卡数据	无外部传输

成本随时间的累积

Api2pdf 收取 $1/月基础费用，加上测量使用（带宽和计算秒数）费用，而IronPDF提供一次性的永久许可证。在 api2pdf.com/pricing 上验证当前数字：

组件	Api2pdf	IronPDF
基础	$1/月	一次性许可证
带宽	每 MB $0.001	不适用（本地）
计算	每秒 $0.00019551	不适用（本地）
体积缩放	与使用和文件大小线性相关	固定（Lite ~$749，Plus ~$1,499，Professional ~$2,999）

较重的工作负载（大文件、JS-heavy 页面、长渲染时间）会增加 api2pdf 的费用；IronPDF的成本一旦授权即固定。

性能和可用性

Api2pdf 需要网络往返，每次生成 PDF 请求会增加 2-5 秒的延迟。IronPDF 的本地处理时间为 100-500 毫秒。此外，IronPDF 可在完全离线和空气屏蔽的环境中工作--这对于不能依赖外部服务可用性的应用程序来说至关重要。

Api2pdf与 IronPDF：主要区别

方面	Api2pdf	IronPDF
数据处理	发送到第三方云服务器	在您的基础设施上进行本地处理
定价	$1/月基础 + 测量式（$0.001/MB 带宽，$0.00019551/秒计算）	一次性永久许可
延迟	2-5 秒（网络往返）	100-500毫秒（本地处理）
离线	不可用	完全离线工作
安装	API 密钥 + HTTP 客户端	简单的 NuGet 软件包
合规性	关注 GDPR/HIPAA（数据离开网络）	完全合规控制

逐步迁移过程

步骤 1：更新 NuGet 软件包

移除Api2pdf软件包并安装 IronPDF：

# Remove Api2pdf
dotnet remove package Api2Pdf

# Install IronPDF
dotnet add package IronPdf

# Remove Api2pdf
dotnet remove package Api2Pdf

# Install IronPDF
dotnet add package IronPdf

SHELL

或通过软件包管理器控制台：

Uninstall-Package Api2Pdf
Install-Package IronPdf

步骤 2：更新命名空间引用

用IronPDF替换Api2pdf命名空间：

// Remove these
using Api2Pdf;

// Add these
using IronPdf;
using IronPdf.Rendering;

// Remove these
using Api2Pdf;

// Add these
using IronPdf;
using IronPdf.Rendering;

Imports IronPdf
Imports IronPdf.Rendering

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步骤 3：配置许可证密钥

在应用程序启动时设置IronPDF许可证密钥：

// Set once at application startup
IronPdf.License.LicenseKey = "YOUR-IRONPDF-LICENSE-KEY";

// Or configure via appsettings.json:
// { "IronPdf.LicenseKey": "YOUR-IRONPDF-LICENSE-KEY" }

// Set once at application startup
IronPdf.License.LicenseKey = "YOUR-IRONPDF-LICENSE-KEY";

// Or configure via appsettings.json:
// { "IronPdf.LicenseKey": "YOUR-IRONPDF-LICENSE-KEY" }

' Set once at application startup
IronPdf.License.LicenseKey = "YOUR-IRONPDF-LICENSE-KEY"

' Or configure via appsettings.json:
' { "IronPdf.LicenseKey": "YOUR-IRONPDF-LICENSE-KEY" }

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步骤 4：移除 API 密钥配置

IronPDF 可在本地运行，不需要 API 密钥：

// Remove thisApi2pdfpattern
var client = new Api2Pdf("API_KEY");

// Just create the renderer directly
var renderer = new ChromePdfRenderer();

// Remove thisApi2pdfpattern
var client = new Api2Pdf("API_KEY");

// Just create the renderer directly
var renderer = new ChromePdfRenderer();

' Remove thisApi2pdfpattern
Dim client = New Api2Pdf("API_KEY")

' Just create the renderer directly
Dim renderer = New ChromePdfRenderer()

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完整的 API 迁移参考

核心类映射

Api2pdf 类	IronPDF 同等产品
`Api2Pdf` (client)	`ChromePdfRenderer`
`Api2PdfResult`	`PdfDocument`
`ChromeHtmlToPdfOptions`	`ChromePdfRenderOptions`

方法映射

Api2pdf 方法	IronPDF 方法
`client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest { Html = html })`	`renderer.RenderHtmlAsPdf(html)`
`client.Chrome.UrlToPdfAsync(new ChromeUrlToPdfRequest { Url = url })`	`renderer.RenderUrlAsPdf(url)`
`result.FileUrl` (下载链接)	`pdf.SaveAs(path)`
`result.GetFileBytes()`	`pdf.BinaryData`
`client.PdfSharp.MergePdfs(new PdfMergeRequest { Urls = urls })`	`PdfDocument.Merge(pdfs)`
`client.PdfSharp.SetPassword(new PdfPasswordRequest { Url, OwnerPassword })`	`pdf.SecuritySettings.OwnerPassword`

渲染选项映射

Api2pdf 选项	IronPDF 选项
`Landscape = true`	`RenderingOptions.PaperOrientation = Landscape`
`PreferCSSPageSize = true` / `Format`	`RenderingOptions.PaperSize = PdfPaperSize.A4`
`PrintBackground = true`	`RenderingOptions.PrintHtmlBackgrounds = true`
`MarginTop` 等	`RenderingOptions.MarginTop` 等
`Delay = 5000`	`RenderingOptions.WaitFor.RenderDelay(5000)`

代码迁移示例

HTML 到 PDF 转换

最常见的Api2pdf操作体现了根本性的转变——从云 API 调用到本地处理。

Api2pdf 实现：

// NuGet: Install-Package Api2Pdf
using System;
using System.Threading.Tasks;
using Api2Pdf;

class Program
{
    static async Task Main(string[] args)
    {
        var client = new Api2Pdf("your-api-key");
        var result = await client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest
        {
            Html = "<h1>Hello World</h1>"
        });
        Console.WriteLine(result.FileUrl);
    }
}

// NuGet: Install-Package Api2Pdf
using System;
using System.Threading.Tasks;
using Api2Pdf;

class Program
{
    static async Task Main(string[] args)
    {
        var client = new Api2Pdf("your-api-key");
        var result = await client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest
        {
            Html = "<h1>Hello World</h1>"
        });
        Console.WriteLine(result.FileUrl);
    }
}

Imports System
Imports System.Threading.Tasks
Imports Api2Pdf

Module Program
    Async Function Main(args As String()) As Task
        Dim client = New Api2Pdf("your-api-key")
        Dim result = Await client.Chrome.HtmlToPdfAsync(New ChromeHtmlToPdfRequest With {
            .Html = "<h1>Hello World</h1>"
        })
        Console.WriteLine(result.FileUrl)
    End Function
End Module

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IronPDF 实现：

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

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");
        pdf.SaveAs("output.pdf");
        Console.WriteLine("PDF created successfully");
    }
}

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

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");
        pdf.SaveAs("output.pdf");
        Console.WriteLine("PDF created successfully");
    }
}

Imports System
Imports IronPdf

Class Program
    Shared Sub Main(ByVal args As String())
        Dim renderer = New ChromePdfRenderer()
        Dim pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>")
        pdf.SaveAs("output.pdf")
        Console.WriteLine("PDF created successfully")
    End Sub
End Class

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IronPDF 消除了网络往返、API 密钥管理以及Api2pdf基于 URL 的响应模式所需的单独下载步骤。

URL到PDF转换

Api2pdf 实现：

// NuGet: Install-Package Api2Pdf
using System;
using System.Threading.Tasks;
using Api2Pdf;

class Program
{
    static async Task Main(string[] args)
    {
        var client = new Api2Pdf("your-api-key");
        var result = await client.Chrome.UrlToPdfAsync(new ChromeUrlToPdfRequest
        {
            Url = "https://www.example.com"
        });
        Console.WriteLine(result.FileUrl);
    }
}

// NuGet: Install-Package Api2Pdf
using System;
using System.Threading.Tasks;
using Api2Pdf;

class Program
{
    static async Task Main(string[] args)
    {
        var client = new Api2Pdf("your-api-key");
        var result = await client.Chrome.UrlToPdfAsync(new ChromeUrlToPdfRequest
        {
            Url = "https://www.example.com"
        });
        Console.WriteLine(result.FileUrl);
    }
}

Imports System
Imports System.Threading.Tasks
Imports Api2Pdf

Module Program
    Async Function Main(args As String()) As Task
        Dim client = New Api2Pdf("your-api-key")
        Dim result = Await client.Chrome.UrlToPdfAsync(New ChromeUrlToPdfRequest With {
            .Url = "https://www.example.com"
        })
        Console.WriteLine(result.FileUrl)
    End Function
End Module

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IronPDF 实现：

// NuGet: Install-Package IronPdf
using System;
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");
        Console.WriteLine("PDF created from URL successfully");
    }
}

// NuGet: Install-Package IronPdf
using System;
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");
        Console.WriteLine("PDF created from URL successfully");
    }
}

Imports System
Imports IronPdf

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

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将 HTML 文件转换为带选项的 PDF 文件

Api2pdf 实现：

// NuGet: Install-Package Api2Pdf
using System;
using System.IO;
using System.Threading.Tasks;
using Api2Pdf;

class Program
{
    static async Task Main(string[] args)
    {
        var client = new Api2Pdf("your-api-key");
        string html = File.ReadAllText("input.html");
        var result = await client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest
        {
            Html = html,
            Options = new ChromeHtmlToPdfOptions
            {
                Landscape = true,
                PrintBackground = true
            }
        });
        Console.WriteLine(result.FileUrl);
    }
}

// NuGet: Install-Package Api2Pdf
using System;
using System.IO;
using System.Threading.Tasks;
using Api2Pdf;

class Program
{
    static async Task Main(string[] args)
    {
        var client = new Api2Pdf("your-api-key");
        string html = File.ReadAllText("input.html");
        var result = await client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest
        {
            Html = html,
            Options = new ChromeHtmlToPdfOptions
            {
                Landscape = true,
                PrintBackground = true
            }
        });
        Console.WriteLine(result.FileUrl);
    }
}

Imports System
Imports System.IO
Imports System.Threading.Tasks
Imports Api2Pdf

Module Program
    Async Function Main(args As String()) As Task
        Dim client = New Api2Pdf("your-api-key")
        Dim html As String = File.ReadAllText("input.html")
        Dim result = Await client.Chrome.HtmlToPdfAsync(New ChromeHtmlToPdfRequest With {
            .Html = html,
            .Options = New ChromeHtmlToPdfOptions With {
                .Landscape = True,
                .PrintBackground = True
            }
        })
        Console.WriteLine(result.FileUrl)
    End Function
End Module

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IronPDF 实现：

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

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();
        renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Landscape;
        renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print;
        string html = File.ReadAllText("input.html");
        var pdf = renderer.RenderHtmlAsPdf(html);
        pdf.SaveAs("output.pdf");
        Console.WriteLine("PDF created with options successfully");
    }
}

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

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();
        renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Landscape;
        renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print;
        string html = File.ReadAllText("input.html");
        var pdf = renderer.RenderHtmlAsPdf(html);
        pdf.SaveAs("output.pdf");
        Console.WriteLine("PDF created with options successfully");
    }
}

Imports System
Imports System.IO
Imports IronPdf

Module Program
    Sub Main(args As String())
        Dim renderer As New ChromePdfRenderer()
        renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Landscape
        renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print
        Dim html As String = File.ReadAllText("input.html")
        Dim pdf = renderer.RenderHtmlAsPdf(html)
        pdf.SaveAs("output.pdf")
        Console.WriteLine("PDF created with options successfully")
    End Sub
End Module

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IronPDF 直接在渲染器对象上配置渲染选项，而不是将其作为单独的选项参数传递给每个 API 调用。

合并多个 PDF 文件

Api2pdf 实现：

using Api2Pdf;

var client = new Api2Pdf("YOUR_API_KEY");

var pdfUrls = new List<string>
{
    "https://example.com/pdf1.pdf",
    "https://example.com/pdf2.pdf",
    "https://example.com/pdf3.pdf"
};

var request = new PdfMergeRequest { Urls = pdfUrls };
var result = await client.PdfSharp.MergePdfsAsync(request);

if (result.Success)
{
    // Download merged PDF from result.FileUrl
}

using Api2Pdf;

var client = new Api2Pdf("YOUR_API_KEY");

var pdfUrls = new List<string>
{
    "https://example.com/pdf1.pdf",
    "https://example.com/pdf2.pdf",
    "https://example.com/pdf3.pdf"
};

var request = new PdfMergeRequest { Urls = pdfUrls };
var result = await client.PdfSharp.MergePdfsAsync(request);

if (result.Success)
{
    // Download merged PDF from result.FileUrl
}

Imports Api2Pdf

Dim client As New Api2Pdf("YOUR_API_KEY")

Dim pdfUrls As New List(Of String) From {
    "https://example.com/pdf1.pdf",
    "https://example.com/pdf2.pdf",
    "https://example.com/pdf3.pdf"
}

Dim request As New PdfMergeRequest With {.Urls = pdfUrls}
Dim result = Await client.PdfSharp.MergePdfsAsync(request)

If result.Success Then
    ' Download merged PDF from result.FileUrl
End If

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IronPDF 实现：

using IronPdf;

// Load PDFs from files
var pdf1 = PdfDocument.FromFile("document1.pdf");
var pdf2 = PdfDocument.FromFile("document2.pdf");
var pdf3 = PdfDocument.FromFile("document3.pdf");

// Merge all PDFs
var merged = PdfDocument.Merge(pdf1, pdf2, pdf3);
merged.SaveAs("merged.pdf");

using IronPdf;

// Load PDFs from files
var pdf1 = PdfDocument.FromFile("document1.pdf");
var pdf2 = PdfDocument.FromFile("document2.pdf");
var pdf3 = PdfDocument.FromFile("document3.pdf");

// Merge all PDFs
var merged = PdfDocument.Merge(pdf1, pdf2, pdf3);
merged.SaveAs("merged.pdf");

Imports IronPdf

' Load PDFs from files
Dim pdf1 = PdfDocument.FromFile("document1.pdf")
Dim pdf2 = PdfDocument.FromFile("document2.pdf")
Dim pdf3 = PdfDocument.FromFile("document3.pdf")

' Merge all PDFs
Dim merged = PdfDocument.Merge(pdf1, pdf2, pdf3)
merged.SaveAs("merged.pdf")

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IronPDF 的静态 Merge 方法可以直接接受多个文档，省去了基于URL的工作流程。

受密码保护的 PDF 文件

Api2pdf 实现：

using Api2Pdf;

var client = new Api2Pdf("YOUR_API_KEY");

// Generate PDF first
var pdfResult = await client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest
{
    Html = "<h1>Confidential</h1>"
});

// Then add password protection in a second round-trip
var protectedResult = await client.PdfSharp.SetPasswordAsync(new PdfPasswordRequest
{
    Url = pdfResult.FileUrl,
    OwnerPassword = "secretpassword"
});

using Api2Pdf;

var client = new Api2Pdf("YOUR_API_KEY");

// Generate PDF first
var pdfResult = await client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest
{
    Html = "<h1>Confidential</h1>"
});

// Then add password protection in a second round-trip
var protectedResult = await client.PdfSharp.SetPasswordAsync(new PdfPasswordRequest
{
    Url = pdfResult.FileUrl,
    OwnerPassword = "secretpassword"
});

Imports Api2Pdf

Dim client = New Api2Pdf("YOUR_API_KEY")

' Generate PDF first
Dim pdfResult = Await client.Chrome.HtmlToPdfAsync(New ChromeHtmlToPdfRequest With {
    .Html = "<h1>Confidential</h1>"
})

' Then add password protection in a second round-trip
Dim protectedResult = Await client.PdfSharp.SetPasswordAsync(New PdfPasswordRequest With {
    .Url = pdfResult.FileUrl,
    .OwnerPassword = "secretpassword"
})

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IronPDF 实现：

using IronPdf;

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

// Set security in one step
pdf.SecuritySettings.OwnerPassword = "owner123";
pdf.SecuritySettings.UserPassword = "user123";
pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.NoPrint;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;
pdf.SecuritySettings.AllowUserEdits = PdfEditSecurity.NoEdit;

pdf.SaveAs("protected.pdf");

using IronPdf;

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

// Set security in one step
pdf.SecuritySettings.OwnerPassword = "owner123";
pdf.SecuritySettings.UserPassword = "user123";
pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.NoPrint;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;
pdf.SecuritySettings.AllowUserEdits = PdfEditSecurity.NoEdit;

pdf.SaveAs("protected.pdf");

Imports IronPdf

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

' Set security in one step
pdf.SecuritySettings.OwnerPassword = "owner123"
pdf.SecuritySettings.UserPassword = "user123"
pdf.SecuritySettings.AllowUserPrinting = PdfPrintSecurity.NoPrint
pdf.SecuritySettings.AllowUserCopyPasteContent = False
pdf.SecuritySettings.AllowUserEdits = PdfEditSecurity.NoEdit

pdf.SaveAs("protected.pdf")

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IronPDF 通过 SecuritySettings 属性提供对PDF权限的精细控制。

页眉和页脚

Api2pdf 实现：

using Api2Pdf;

var client = new Api2Pdf("YOUR_API_KEY");

var result = await client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest
{
    Html = html,
    Options = new ChromeHtmlToPdfOptions
    {
        DisplayHeaderFooter = true,
        HeaderTemplate = "<div style='font-size:10px'>Company Header</div>",
        FooterTemplate = "<div style='font-size:10px'>Page <span class='pageNumber'></span></div>"
    }
});

using Api2Pdf;

var client = new Api2Pdf("YOUR_API_KEY");

var result = await client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest
{
    Html = html,
    Options = new ChromeHtmlToPdfOptions
    {
        DisplayHeaderFooter = true,
        HeaderTemplate = "<div style='font-size:10px'>Company Header</div>",
        FooterTemplate = "<div style='font-size:10px'>Page <span class='pageNumber'></span></div>"
    }
});

Imports Api2Pdf

Dim client = New Api2Pdf("YOUR_API_KEY")

Dim result = Await client.Chrome.HtmlToPdfAsync(New ChromeHtmlToPdfRequest With {
    .Html = html,
    .Options = New ChromeHtmlToPdfOptions With {
        .DisplayHeaderFooter = True,
        .HeaderTemplate = "<div style='font-size:10px'>Company Header</div>",
        .FooterTemplate = "<div style='font-size:10px'>Page <span class='pageNumber'></span></div>"
    }
})

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IronPDF 实现：

using IronPdf;

var renderer = new ChromePdfRenderer();

// HTML headers and footers with full styling
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter
{
    HtmlFragment = "<div style='font-size:10px; text-align:center;'>Company Header</div>",
    DrawDividerLine = true
};

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

var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SaveAs("with-headers.pdf");

using IronPdf;

var renderer = new ChromePdfRenderer();

// HTML headers and footers with full styling
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter
{
    HtmlFragment = "<div style='font-size:10px; text-align:center;'>Company Header</div>",
    DrawDividerLine = true
};

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

var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SaveAs("with-headers.pdf");

Imports IronPdf

Dim renderer As New ChromePdfRenderer()

' HTML headers and footers with full styling
renderer.RenderingOptions.HtmlHeader = New HtmlHeaderFooter With {
    .HtmlFragment = "<div style='font-size:10px; text-align:center;'>Company Header</div>",
    .DrawDividerLine = True
}

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

Dim pdf = renderer.RenderHtmlAsPdf(html)
pdf.SaveAs("with-headers.pdf")

$vbLabelText $csharpLabel

IronPDF 支持占位符令牌，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。

ASP.NET Core 集成

Api2pdf 的异步 HTTP 模式与IronPDF的直接生成 PDF 有很大不同。

Api2pdf模式：

[ApiController]
public class PdfController : ControllerBase
{
    private readonly Api2Pdf _client;

    public PdfController()
    {
        _client = new Api2Pdf("YOUR_API_KEY");
    }

    [HttpGet("generate")]
    public async Task<IActionResult> GeneratePdf()
    {
        var result = await _client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest
        {
            Html = "<h1>Report</h1>"
        });

        if (!result.Success)
            return BadRequest(result.Error);

        // Redirect to download URL
        return Redirect(result.FileUrl);
    }
}

[ApiController]
public class PdfController : ControllerBase
{
    private readonly Api2Pdf _client;

    public PdfController()
    {
        _client = new Api2Pdf("YOUR_API_KEY");
    }

    [HttpGet("generate")]
    public async Task<IActionResult> GeneratePdf()
    {
        var result = await _client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest
        {
            Html = "<h1>Report</h1>"
        });

        if (!result.Success)
            return BadRequest(result.Error);

        // Redirect to download URL
        return Redirect(result.FileUrl);
    }
}

Imports Microsoft.AspNetCore.Mvc

<ApiController>
Public Class PdfController
    Inherits ControllerBase

    Private ReadOnly _client As Api2Pdf

    Public Sub New()
        _client = New Api2Pdf("YOUR_API_KEY")
    End Sub

    <HttpGet("generate")>
    Public Async Function GeneratePdf() As Task(Of IActionResult)
        Dim result = Await _client.Chrome.HtmlToPdfAsync(New ChromeHtmlToPdfRequest With {
            .Html = "<h1>Report</h1>"
        })

        If Not result.Success Then
            Return BadRequest(result.Error)
        End If

        ' Redirect to download URL
        Return Redirect(result.FileUrl)
    End Function
End Class

$vbLabelText $csharpLabel

IronPDF模式：

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

        // Return PDF directly - no download step needed
        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]
public class PdfController : ControllerBase
{
    [HttpGet("generate")]
    public IActionResult GeneratePdf()
    {
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf("<h1>Report</h1>");

        // Return PDF directly - no download step needed
        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>
Public Class PdfController
    Inherits ControllerBase

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

        ' Return PDF directly - no download step needed
        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

$vbLabelText $csharpLabel

IronPDF 通过 BinaryData 或 Stream 直接返回PDF，省去了重定向下载的模式。

依赖注入配置

// Program.cs or Startup.cs
public void ConfigureServices(IServiceCollection services)
{
    services.AddScoped<IPdfService, IronPdfService>();
}

// IPdfService.cs
public interface IPdfService
{
    PdfDocument GenerateFromHtml(string html);
    Task<PdfDocument> GenerateFromHtmlAsync(string html);
}

// IronPdfService.cs
public class IronPdfService : IPdfService
{
    private readonly ChromePdfRenderer _renderer;

    public IronPdfService()
    {
        _renderer = new ChromePdfRenderer();
        _renderer.RenderingOptions.PrintHtmlBackgrounds = true;
        _renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
    }

    public PdfDocument GenerateFromHtml(string html) =>
        _renderer.RenderHtmlAsPdf(html);

    public Task<PdfDocument> GenerateFromHtmlAsync(string html) =>
        _renderer.RenderHtmlAsPdfAsync(html);
}

// Program.cs or Startup.cs
public void ConfigureServices(IServiceCollection services)
{
    services.AddScoped<IPdfService, IronPdfService>();
}

// IPdfService.cs
public interface IPdfService
{
    PdfDocument GenerateFromHtml(string html);
    Task<PdfDocument> GenerateFromHtmlAsync(string html);
}

// IronPdfService.cs
public class IronPdfService : IPdfService
{
    private readonly ChromePdfRenderer _renderer;

    public IronPdfService()
    {
        _renderer = new ChromePdfRenderer();
        _renderer.RenderingOptions.PrintHtmlBackgrounds = true;
        _renderer.RenderingOptions.PaperSize = PdfPaperSize.A4;
    }

    public PdfDocument GenerateFromHtml(string html) =>
        _renderer.RenderHtmlAsPdf(html);

    public Task<PdfDocument> GenerateFromHtmlAsync(string html) =>
        _renderer.RenderHtmlAsPdfAsync(html);
}

' Program.vb or Startup.vb
Public Sub ConfigureServices(services As IServiceCollection)
    services.AddScoped(Of IPdfService, IronPdfService)()
End Sub

' IPdfService.vb
Public Interface IPdfService
    Function GenerateFromHtml(html As String) As PdfDocument
    Function GenerateFromHtmlAsync(html As String) As Task(Of PdfDocument)
End Interface

' IronPdfService.vb
Public Class IronPdfService
    Implements IPdfService

    Private ReadOnly _renderer As ChromePdfRenderer

    Public Sub New()
        _renderer = New ChromePdfRenderer()
        _renderer.RenderingOptions.PrintHtmlBackgrounds = True
        _renderer.RenderingOptions.PaperSize = PdfPaperSize.A4
    End Sub

    Public Function GenerateFromHtml(html As String) As PdfDocument Implements IPdfService.GenerateFromHtml
        Return _renderer.RenderHtmlAsPdf(html)
    End Function

    Public Function GenerateFromHtmlAsync(html As String) As Task(Of PdfDocument) Implements IPdfService.GenerateFromHtmlAsync
        Return _renderer.RenderHtmlAsPdfAsync(html)
    End Function
End Class

$vbLabelText $csharpLabel

错误处理迁移

Api2pdf 使用响应对象检查。IronPDF使用标准的 .NET 异常。

Api2pdf模式：

var result = await client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest { Html = html });

if (!result.Success)
{
    Console.WriteLine($"Error: {result.Error}");
    return;
}

var result = await client.Chrome.HtmlToPdfAsync(new ChromeHtmlToPdfRequest { Html = html });

if (!result.Success)
{
    Console.WriteLine($"Error: {result.Error}");
    return;
}

Imports System

Dim result = Await client.Chrome.HtmlToPdfAsync(New ChromeHtmlToPdfRequest With {.Html = html})

If Not result.Success Then
    Console.WriteLine($"Error: {result.Error}")
    Return
End If

$vbLabelText $csharpLabel

IronPDF模式：

try
{
    var renderer = new ChromePdfRenderer();
    var pdf = renderer.RenderHtmlAsPdf(html);
    pdf.SaveAs("output.pdf");
}
catch (IronPdf.Exceptions.IronPdfLicenseException ex)
{
    Console.WriteLine($"License error: {ex.Message}");
}
catch (IronPdf.Exceptions.IronPdfRenderingException ex)
{
    Console.WriteLine($"Rendering error: {ex.Message}");
}
catch (Exception ex)
{
    Console.WriteLine($"Error: {ex.Message}");
}

try
{
    var renderer = new ChromePdfRenderer();
    var pdf = renderer.RenderHtmlAsPdf(html);
    pdf.SaveAs("output.pdf");
}
catch (IronPdf.Exceptions.IronPdfLicenseException ex)
{
    Console.WriteLine($"License error: {ex.Message}");
}
catch (IronPdf.Exceptions.IronPdfRenderingException ex)
{
    Console.WriteLine($"Rendering error: {ex.Message}");
}
catch (Exception ex)
{
    Console.WriteLine($"Error: {ex.Message}");
}

Imports IronPdf.Exceptions

Try
    Dim renderer = New ChromePdfRenderer()
    Dim pdf = renderer.RenderHtmlAsPdf(html)
    pdf.SaveAs("output.pdf")
Catch ex As IronPdfLicenseException
    Console.WriteLine($"License error: {ex.Message}")
Catch ex As IronPdfRenderingException
    Console.WriteLine($"Rendering error: {ex.Message}")
Catch ex As Exception
    Console.WriteLine($"Error: {ex.Message}")
End Try

$vbLabelText $csharpLabel

性能比较

指标	Api2pdf	IronPDF
简单 HTML	2-5 秒（网络）	100-500毫秒（本地）
复杂页面	5-10 秒	500ms-2s
每批 100 份	分钟（费率限制）	秒（并行）
离线	不可用	工作内容
冷启动	None	~2 秒（第一次渲染）

性能优化技巧

// 1. Reuse renderer instance
private static readonly ChromePdfRenderer SharedRenderer = new ChromePdfRenderer();

public PdfDocument GeneratePdf(string html)
{
    return SharedRenderer.RenderHtmlAsPdf(html);
}

// 2. Parallel generation
var tasks = htmlDocs.Select(html =>
    Task.Run(() => SharedRenderer.RenderHtmlAsPdf(html)));
var results = await Task.WhenAll(tasks);

// 3. Disable unnecessary features for speed
var renderer = new ChromePdfRenderer();
renderer.RenderingOptions.EnableJavaScript = false; // If not needed
renderer.RenderingOptions.WaitFor.RenderDelay(0);   // No delay

// 1. Reuse renderer instance
private static readonly ChromePdfRenderer SharedRenderer = new ChromePdfRenderer();

public PdfDocument GeneratePdf(string html)
{
    return SharedRenderer.RenderHtmlAsPdf(html);
}

// 2. Parallel generation
var tasks = htmlDocs.Select(html =>
    Task.Run(() => SharedRenderer.RenderHtmlAsPdf(html)));
var results = await Task.WhenAll(tasks);

// 3. Disable unnecessary features for speed
var renderer = new ChromePdfRenderer();
renderer.RenderingOptions.EnableJavaScript = false; // If not needed
renderer.RenderingOptions.WaitFor.RenderDelay(0);   // No delay

Imports System.Threading.Tasks

' 1. Reuse renderer instance
Private Shared ReadOnly SharedRenderer As New ChromePdfRenderer()

Public Function GeneratePdf(html As String) As PdfDocument
    Return SharedRenderer.RenderHtmlAsPdf(html)
End Function

' 2. Parallel generation
Dim tasks = htmlDocs.Select(Function(html) Task.Run(Function() SharedRenderer.RenderHtmlAsPdf(html)))
Dim results = Await Task.WhenAll(tasks)

' 3. Disable unnecessary features for speed
Dim renderer As New ChromePdfRenderer()
renderer.RenderingOptions.EnableJavaScript = False ' If not needed
renderer.RenderingOptions.WaitFor.RenderDelay(0) ' No delay

$vbLabelText $csharpLabel

常见迁移问题的故障排除

问题：PDF 看起来与Api2pdf输出不同

匹配Api2pdf的无头 Chrome 浏览器设置：

var renderer = new ChromePdfRenderer();
renderer.RenderingOptions.CssMediaType = PdfCssMediaType.Print;
renderer.RenderingOptions.PrintHtmlBackgrounds = true;
renderer.RenderingOptions.ViewPortWidth = 1280;
renderer.RenderingOptions.EnableJavaScript = true;
renderer.RenderingOptions.WaitFor.RenderDelay(1000);

var renderer = new ChromePdfRenderer();
renderer.RenderingOptions.CssMediaType = PdfCssMediaType.Print;
renderer.RenderingOptions.PrintHtmlBackgrounds = true;
renderer.RenderingOptions.ViewPortWidth = 1280;
renderer.RenderingOptions.EnableJavaScript = true;
renderer.RenderingOptions.WaitFor.RenderDelay(1000);

Dim renderer = New ChromePdfRenderer()
renderer.RenderingOptions.CssMediaType = PdfCssMediaType.Print
renderer.RenderingOptions.PrintHtmlBackgrounds = True
renderer.RenderingOptions.ViewPortWidth = 1280
renderer.RenderingOptions.EnableJavaScript = True
renderer.RenderingOptions.WaitFor.RenderDelay(1000)

$vbLabelText $csharpLabel

问题：外部资源无法加载

配置资源加载超时：

var renderer = new ChromePdfRenderer();
renderer.RenderingOptions.WaitFor.AllFontsLoaded(timeout: 10000);
renderer.RenderingOptions.WaitFor.NetworkIdle(timeout: 10000);

// Or use base URL for relative paths
var pdf = renderer.RenderHtmlAsPdf(html, baseUrl: "https://example.com/");

var renderer = new ChromePdfRenderer();
renderer.RenderingOptions.WaitFor.AllFontsLoaded(timeout: 10000);
renderer.RenderingOptions.WaitFor.NetworkIdle(timeout: 10000);

// Or use base URL for relative paths
var pdf = renderer.RenderHtmlAsPdf(html, baseUrl: "https://example.com/");

Dim renderer = New ChromePdfRenderer()
renderer.RenderingOptions.WaitFor.AllFontsLoaded(timeout:=10000)
renderer.RenderingOptions.WaitFor.NetworkIdle(timeout:=10000)

' Or use base URL for relative paths
Dim pdf = renderer.RenderHtmlAsPdf(html, baseUrl:="https://example.com/")

$vbLabelText $csharpLabel

问题：PDF 文件大小

生成后压缩图像：

renderer.RenderingOptions.ImageQuality = 80;

// Or compress after generation
pdf.CompressImages(quality: 75);
pdf.SaveAs("compressed.pdf");

renderer.RenderingOptions.ImageQuality = 80;

// Or compress after generation
pdf.CompressImages(quality: 75);
pdf.SaveAs("compressed.pdf");

renderer.RenderingOptions.ImageQuality = 80

' Or compress after generation
pdf.CompressImages(quality:=75)
pdf.SaveAs("compressed.pdf")

$vbLabelText $csharpLabel

迁移后核对表

完成代码迁移后，请验证以下内容：

验证 PDF 输出质量是否符合预期
测试所有极端情况（大型文档、特殊字符）
验证绩效指标（应有显著改善）
如果需要，更新 Docker 配置
删除Api2pdf门户帐户和 API 密钥
更新监控（不再需要跟踪 API 延迟）
为你的团队记录新模式
更新 CI/CD 流水线

其他资源

从Api2pdf迁移到IronPDF可将您的 PDF 生成从依赖云的按转换成本模式转变为本地的一次性投资。您的敏感文档将保留在您的基础架构上，延迟时间将从几秒缩短到几毫秒，而且您还可以消除对供应商的依赖性，从而实现这一关键应用功能。

请注意API2PDF 和 PDFSharp 是各自所有者的注册商标。本网站与 Api2Pdf 或 empira Software GmbH 无关联、认可或赞助。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。

Curtis Chau

立即与工程团队聊天

技术作家

Curtis Chau 拥有卡尔顿大学的计算机科学学士学位，专注于前端开发，精通 Node.js、TypeScript、JavaScript 和 React。他热衷于打造直观且美观的用户界面，喜欢使用现代框架并创建结构良好、视觉吸引力强的手册。

除了开发之外，Curtis 对物联网 (IoT) 有浓厚的兴趣，探索将硬件和软件集成的新方法。在空闲时间，他喜欢玩游戏和构建 Discord 机器人，将他对技术的热爱与创造力相结合。

已更新2026年7月19日

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已更新2026年7月19日

如何在 C# | IronPDF 中使用 IronPDF 转换 PDF 页面

本视频教程全面介绍了如何使用 IronPDF for .NET 操作 PDF 页面。学习在现有 PDF 文档中旋转、缩放和重新定位页面等基本技术，增强您的文档管理和编辑能力。

如何在使用IronPDF的PDF中添加页眉和页脚

如何在PDF中绘制文本和位图

客户亮点：

开发者焦点：

网络研讨会：

立即开始30天免费试用

如何从PDF中提取嵌入文本和图像

为什么考虑从 API2PDF 迁移？

安全和合规问题

成本随时间的累积

性能和可用性

Api2pdf与 IronPDF：主要区别

逐步迁移过程

步骤 1：更新 NuGet 软件包

步骤 2：更新命名空间引用

步骤 3：配置许可证密钥

步骤 4：移除 API 密钥配置

完整的 API 迁移参考

核心类映射

方法映射

渲染选项映射

代码迁移示例

HTML 到 PDF 转换

URL到PDF转换

将 HTML 文件转换为带选项的 PDF 文件

合并多个 PDF 文件

受密码保护的 PDF 文件

页眉和页脚

ASP.NET Core 集成

依赖注入配置

错误处理迁移

性能比较

性能优化技巧

常见迁移问题的故障排除

问题：PDF 看起来与Api2pdf输出不同

问题：外部资源无法加载

问题：PDF 文件大小

迁移后核对表

其他资源

您的许可证密钥已发送到您的收件箱

您的演示请求已提交。

钢铁支援团队

立即开始30天免费试用

如何从PDF中提取嵌入文本和图像

为什么考虑从 API2PDF 迁移？

安全和合规问题

成本随时间的累积

性能和可用性

Api2pdf与 IronPDF：主要区别

逐步迁移过程

步骤 1：更新 NuGet 软件包

步骤 2：更新命名空间引用

步骤 3：配置许可证密钥

步骤 4：移除 API 密钥配置

完整的 API 迁移参考

核心类映射

方法映射

渲染选项映射

代码迁移示例

HTML 到 PDF 转换

URL到PDF转换

将 HTML 文件转换为带选项的 PDF 文件

合并多个 PDF 文件

受密码保护的 PDF 文件

页眉和页脚

ASP.NET Core 集成

依赖注入配置

错误处理迁移

性能比较

性能优化技巧

常见迁移问题的故障排除

问题：PDF 看起来与Api2pdf输出不同

问题：外部资源无法加载

问题：PDF 文件大小

迁移后核对表

其他资源

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