//根据Url地址得到网页的html源码         private string GetWebContent(string Url)         {             string strResult="";             try             {                 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);　　　　//声明一个HttpWebRequest请求                 request.Timeout = 30000;                //设置连接超时时间                 request.Headers.Set("Pragma", "no-cache");                 HttpWebResponse response = (HttpWebResponse)request.GetResponse();                 Stream streamReceive = response.GetResponseStream();                 Encoding encoding = Encoding.GetEncoding("GB2312");                 StreamReader streamReader = new StreamReader(streamReceive, encoding);                 strResult = streamReader.ReadToEnd();             }             catch             {                 MessageBox.Show("出错");             }             return strResult;         }为了使用HttpWebRequest和HttpWebResponse，需填名字空间引用　　using System.Net;以下是程序具体实现过程：private void button1_Click(object sender, EventArgs e)         {            //要抓取的URL地址             string Url = "http://list.mp3.baidu.com/topso/mp3topsong.html?id=1#top2";            //得到指定Url的源码　　　string strWebContent = GetWebContent(Url);             richTextBox1.Text = strWebContent;　　　 //取出和数据有关的那段源码             int iBodyStart = strWebContent.IndexOf("
    
     ", iTableStart);             string strWeb = strWebContent.Substring(iTableStart, iTableEnd - iTableStart + 8);            //生成HtmlDocument　　　       WebBrowser webb = new WebBrowser();             webb.Navigate("about:blank");             HtmlDocument htmldoc = webb.Document.OpenNew(true);             htmldoc.Write(strWeb);             HtmlElementCollection htmlTR = htmldoc.GetElementsByTagName("TR");             foreach (HtmlElement tr in htmlTR)             {                 string strID = tr.GetElementsByTagName("TD")[0].InnerText;                 string strName = SplitName(tr.GetElementsByTagName("TD")[1].InnerText, "MusicName");                 string strSinger = SplitName(tr.GetElementsByTagName("TD")[1].InnerText, "Singer");                 strID = strID.Replace(".", "");                //插入DataTable                 AddLine(strID, strName, strSinger,"0");                 string strID1 = tr.GetElementsByTagName("TD")[2].InnerText;                 string strName1 = SplitName(tr.GetElementsByTagName("TD")[3].InnerText, "MusicName");                 string strSinger1 = SplitName(tr.GetElementsByTagName("TD")[3].InnerText, "Singer");                //插入DataTable                 strID1 = strID1.Replace(".", "");                 AddLine(strID1, strName1, strSinger1,"0");                 string strID2 = tr.GetElementsByTagName("TD")[4].InnerText;                 string strName2 = SplitName(tr.GetElementsByTagName("TD")[5].InnerText, "MusicName");                 string strSinger2 = SplitName(tr.GetElementsByTagName("TD")[5].InnerText, "Singer");                //插入DataTable                 strID2 = strID2.Replace(".", "");                 AddLine(strID2, strName2, strSinger2,"0");             }            //插入数据库             InsertData(dt);　　　             dataGridView1.DataSource = dt.DefaultView;}