官网地址：htmlagilitypack
百度网盘下载地址：点击
使用方法：
1.引用HtmlAgilityPack.dll文件
2.引用命名空间：
using HtmlAgilityPack;
3.调用（元素查找方式为xpath，用法参见w3school）：
static void Main(string[] args) { string html = GetHtml("http://www.w3school.com.cn/xpath/xpath_syntax.asp"); HtmlDocument doc = new HtmlDocument(); doc.LoadHtml(html); HtmlNode node = doc.DocumentNode; HtmlNode div = node.SelectNodes("//table[@class=‘dataintable‘]")[0]; Console.WriteLine(div.InnerHtml); Console.Read(); } static string GetHtml(string url) { WebRequest request = WebRequest.Create(url); WebResponse res = request.GetResponse(); StreamReader sr = new StreamReader(res.GetResponseStream(), Encoding.UTF8); string html = sr.ReadToEnd(); sr.Close(); res.Close(); return html; }