privatevoidPage_Load(objectsender,System.EventArgse)
{
//在此处放置用户代码以初始化页面

stringurl=https://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/>");
}
}