c# 快速验证代理IP是否有用

 public void yanzhen(string str, int port)         {             WebProxy proxyObject = new WebProxy(str, port);//str为IP地址 port为端口号             HttpWebRequest Req = (HttpWebRequest)WebRequest.Create("http://www.whatismyip.com.tw/");             Req.Proxy = proxyObject; //设置代理             HttpWebResponse Resp = (HttpWebResponse)Req.GetResponse();             string str = "";             string OkStr = "";             Encoding code = Encoding.GetEncoding("UTF-8");             using (StreamReader sr = new StreamReader(Resp.GetResponseStream(), code))             {                 if (sr != null)                 {                     try                     {                         str = sr.ReadToEnd();                         StringSub.substr(str, "

", "

", 0);                         str = str.Substring(str.IndexOf(start) + start.Length);                         OkStr = str.Substring(0, str.IndexOf(last));                         MessageBox.Show("验证成功!显示IP为" + OkStr);                     }                     catch                     {                         MessageBox.Show("文件读取失败!");                     }                     finally                     {                         sr.Close();                     }                 }             }         }

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