1､通过NuGet获取AngleSharp

1）使用Nuget管理控制台

将AngleSharp集成到项目中的最简单方法是使用NuGet。您可以通过打开包管理器控制台（PM）并键入以下语句来安装AngleSharp：

Install-Package AngleSharp

2）使用Nuget图形管理器

使用Nuget的界面的管理器搜索"AngleSharp"=> 找到点出点击"安装"。

相关文档：VS(Visual Studio)中Nuget的使用

2､使用AngleSharp解析html的示例

var source = @"        www.google.com/>  
404. That’s an error.  
The requested URL /error was not found on this server.  That’s all we know.";//使用AngleSharp的默认配置var config = Configuration.Default;//使用给定的配置创建用于评估web页面的新上下文var context = BrowsingContext.New(config);//只需要获得DOM表示var document = await context.OpenAsync(req => req.Content(source));//将其序列化回控制台Console.WriteLine(document.DocumentElement.OuterHtml);

3､简单操作document(Dom文档)

static async Task FirstExample(){    //使用AngleSharp的默认配置    var config = Configuration.Default;    //使用给定的配置创建用于评估web页面的新上下文    var context = BrowsingContext.New(config);    //从响应的内容解析文档到虚拟请求    var document = await context.OpenAsync(req => req.Content("
Some example source
This is a paragraph element"));    //对文档执行如下操作    Console.WriteLine("Serializing the (original) document:");    Console.WriteLine(document.DocumentElement.OuterHtml);    var p = document.CreateElement("p");    p.TextContent = "This is another paragraph.";    Console.WriteLine("Inserting another element in the body ...");    document.Body.AppendChild(p);    Console.WriteLine("Serializing the document again:");    Console.WriteLine(document.DocumentElement.OuterHtml);}

4､获取html中的元素

static async Task UsingLinq(){    //使用默认配置创建一个用于评估web页面的新上下文    var context = BrowsingContext.New(Configuration.Default);    //根据虚拟请求/响应模式创建文档    var document = await context.OpenAsync(req => req.Content("
First item
Second item
Third item!
Last item!
"));    //对LINQ做点什么    var blueListItemsLinq = document.All.Where(m => m.LocalName == "li" && m.ClassList.Contains("blue"));    //或者直接使用CSS选择器    var blueListItemsCssSelector = document.QuerySelectorAll("li.blue");    Console.WriteLine("Comparing both ways ...");    Console.WriteLine();    Console.WriteLine("LINQ:");    foreach (var item in blueListItemsLinq)    {        Console.WriteLine(item.Text());    }    Console.WriteLine();    Console.WriteLine("CSS:");    foreach (var item in blueListItemsCssSelector)    {        Console.WriteLine(item.Text());    }}static async Task SingleElements(){    //使用默认配置创建一个用于评估web页面的新上下文    var context = BrowsingContext.New(Configuration.Default);    //创建一个新文档    var document = await context.OpenAsync(req => req.Content("This is some  bold and italic  text!"));    var emphasize = document.QuerySelector("em");    Console.WriteLine("Difference between several ways of getting text:");    Console.WriteLine();    Console.WriteLine("Only from C# / AngleSharp:");    Console.WriteLine();    Console.WriteLine(emphasize.ToHtml());   // bold and italic     Console.WriteLine(emphasize.Text());   // bold and italic    Console.WriteLine();    Console.WriteLine("From the DOM:");    Console.WriteLine();    Console.WriteLine(emphasize.InnerHtml);  // bold and italic    Console.WriteLine(emphasize.OuterHtml);  // bold and italic     Console.WriteLine(emphasize.TextContent);// bold and italic}

参考文档：https://anglesharp.github.io/docs/Examples.html