这取决于您的其他需求。

一个非常简单但不容易部署的解决方案是使用WebBrowser控件加载Html，然后使用Print方法打印到本地安装的PDF打印机。有一些免费的PDF打印机，WebBrowser控件是. net框架的一部分。

编辑: 如果你的Html是XHtml，你可以使用PDFizer来完成这项工作。

你可以使用谷歌Chrome打印到pdf功能从它的无头模式。我发现这是最简单但最健壮的方法。

var url = "https://stackoverflow.com/questions/564650/convert-html-to-pdf-in-net";
var chromePath = @"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe";
var output = Path.Combine(Environment.CurrentDirectory, "printout.pdf");
using (var p = new Process())
    {
        p.StartInfo.FileName = chromePath;
        p.StartInfo.Arguments = $"--headless --disable-gpu --print-to-pdf={output} {url}";
        p.Start();
        p.WaitForExit();
    }

最后更新:2020年10月

这是我整理的。net中HTML到PDF转换的选项列表(有些是免费的，有些是付费的)

GemBox.Document https://www.nuget.org/packages/GemBox.Document/ Free (up to 20 paragraphs) $680 - https://www.gemboxsoftware.com/document/pricelist https://www.gemboxsoftware.com/document/examples/c-sharp-convert-html-to-pdf/307 PDF Metamorphosis .Net https://www.nuget.org/packages/sautinsoft.pdfmetamorphosis/ $539 - $1078 - https://www.sautinsoft.com/products/pdf-metamorphosis/order.php https://www.sautinsoft.com/products/pdf-metamorphosis/convert-html-to-pdf-dotnet-csharp.php HtmlRenderer.PdfSharp https://www.nuget.org/packages/HtmlRenderer.PdfSharp/1.5.1-beta1 BSD-UNSPECIFIED License PuppeteerSharp https://www.puppeteersharp.com/examples/index.html MIT License https://github.com/kblok/puppeteer-sharp EO.Pdf https://www.nuget.org/packages/EO.Pdf/ $799 - https://www.essentialobjects.com/Purchase.aspx?f=3 WnvHtmlToPdf_x64 https://www.nuget.org/packages/WnvHtmlToPdf_x64/ $750 - $1600 - http://www.winnovative-software.com/Buy.aspx demo - http://www.winnovative-software.com/demo/default.aspx IronPdf https://www.nuget.org/packages/IronPdf/ $399 - $1599 - https://ironpdf.com/licensing/ https://ironpdf.com/examples/using-html-to-create-a-pdf/ Spire.PDF https://www.nuget.org/packages/Spire.PDF/ Free (up to 10 pages) $599 - $1799 - https://www.e-iceblue.com/Buy/Spire.PDF.html https://www.e-iceblue.com/Tutorials/Spire.PDF/Spire.PDF-Program-Guide/Convert-HTML-to-PDF-Customize-HTML-to-PDF-Conversion-by-Yourself.html Aspose.Html https://www.nuget.org/packages/Aspose.Html/ $599 - $1797 - https://purchase.aspose.com/pricing/html/net https://docs.aspose.com/html/net/html-to-pdf-conversion/ EvoPDF https://www.nuget.org/packages/EvoPDF/ $450 - $1200 - http://www.evopdf.com/buy.aspx ExpertPdfHtmlToPdf https://www.nuget.org/packages/ExpertPdfHtmlToPdf/ $550 - $1200 - https://www.html-to-pdf.net/Pricing.aspx Zetpdf https://zetpdf.com $299 - $599 - https://zetpdf.com/pricing/ Is not a well know or supported library - ZetPDF - Does anyone know the background of this Product? PDFtron https://www.pdftron.com/documentation/samples/cs/HTML2PDFTes $4000/year - https://www.pdftron.com/licensing/ WkHtmlToXSharp https://github.com/pruiz/WkHtmlToXSharp Free Concurrent conversion is implemented as processing queue. SelectPDF https://www.nuget.org/packages/Select.HtmlToPdf/ Free (up to 5 pages) $499 - $799 - https://selectpdf.com/pricing/ https://selectpdf.com/pdf-library-for-net/

如果上面的选项都帮不了你，你可以搜索NuGet包: https://www.nuget.org/packages?q=html+pdf

很可能大多数项目将包装C/ c++引擎，而不是从头开始实现c#解决方案。试试哥德堡计划。

为了测试它

docker run --rm -p 3000:3000 thecodingmachine/gotenberg:6

旋度样本

curl --request POST \
    --url http://localhost:3000/convert/url \
    --header 'Content-Type: multipart/form-data' \
    --form remoteURL=https://brave.com \
    --form marginTop=0 \
    --form marginBottom=0 \
    --form marginLeft=0 \
    --form marginRight=0 \
    -o result.pdf

c# sample.cs

using System;
using System.Net.Http;
using System.Threading.Tasks;
using System.IO;
using static System.Console;

namespace Gotenberg
{
    class Program
    {
        public static async Task Main(string[] args)
        {
            try
            {
                var client = new HttpClient();            
                var formContent = new MultipartFormDataContent
                    {
                        {new StringContent("https://brave.com/"), "remoteURL"},
                        {new StringContent("0"), "marginTop" }
                    };
                var result = await client.PostAsync(new Uri("http://localhost:3000/convert/url"), formContent);
                await File.WriteAllBytesAsync("brave.com.pdf", await result.Content.ReadAsByteArrayAsync());
            }
            catch (Exception ex)
            {
                WriteLine(ex);
            }
        }
    }
}

要编译

csc sample.cs -langversion:latest -reference:System.Net.Http.dll && mono ./sample.exe

在c#中转换HTML到PDF使用ABCpdf。

ABCpdf可以使用Gecko或Trident呈现引擎，因此您的HTML表看起来与FireFox和Internet Explorer中的相同。

在www.abcpdfeditor.com上有一个ABCpdf的在线演示。您可以使用它来检查您的表将如何首先呈现，而不需要下载和安装软件。

为了渲染整个网页，你需要AddImageUrl或AddImageHtml函数。但如果你想做的只是添加HTML样式的文本，那么你可以尝试AddHtml函数，如下所示:

Doc theDoc = new Doc();
theDoc.FontSize = 72;
theDoc.AddHtml("<b>Some HTML styled text</b>");
theDoc.Save(Server.MapPath("docaddhtml.pdf"));
theDoc.Clear();

ABCpdf是一个商业软件，但是标准版通常可以在特别优惠下免费获得。

如果你需要完美的html pdf渲染，你需要使用商业库。

ExpertPdf Html To Pdf Converter非常容易使用，它支持最新的html5/css3。您可以将整个url转换为pdf:

using ExpertPdf.HtmlToPdf; 
byte[] pdfBytes = new PdfConverter().GetPdfBytesFromUrl(url);

或者HTML字符串:

using ExpertPdf.HtmlToPdf; 
byte[] pdfBytes = new PdfConverter().GetPdfBytesFromHtmlString(html, baseUrl);

您还可以选择直接将生成的pdf文档保存到磁盘上的文件流。