privatevoidPage_Load(objectsender,System.EventArgse)

{

//在此处放置用户代码以初始化页面

stringurl=http://www.jb51.net;

System.Net.HttpWebRequesthttpReq;

System.Net.HttpWebResponsehttpRes;

System.UrihttpURL=newUri(url);

httpReq=(System.Net.HttpWebRequest)System.Net.WebRequest.Create(httpURL);

httpReq.Method="GET";

httpRes=(System.Net.HttpWebResponse)httpReq.GetResponse();

httpReq.KeepAlive=false;

System.IO.StreamReadersReader=newSystem.IO.StreamReader(httpRes.GetResponseStream(),System.Text.Encoding.GetEncoding("GB2312"));

stringres=sReader.ReadToEnd();

//以下是利用正则表达式对获取的文本流进行过滤

stringstrRegex=@"<a.+?a>";

System.Text.RegularExpressions.Regexr;

System.Text.RegularExpressions.MatchCollectionm;

r=newSystem.Text.RegularExpressions.Regex(strRegex,System.Text.RegularExpressions.RegexOptions.IgnoreCase);

m=r.Matches(res);

Response.Write("该页共有"+m.Count+"个超连接<br/>");

for(inti=0;i<m.Count;i++)

{

Response.Write(m[i].Value+"<br/>");

}

}