.net HttpWebRequest使用代理请求

 string responseStr = ""; HttpWebRequest myWebRequest = (HttpWebRequest)System.Net.WebRequest.Create(url);                           WebProxy proxyObject = new WebProxy(Ip, true);//str为IP地址 port为端口号 代理类                    myWebRequest.Proxy = proxyObject; //设置代理                             //myWebRequest.Method = "GET";                //myWebRequest.Timeout = 5000;                myWebRequest.KeepAlive = false;                myWebRequest.AllowAutoRedirect = true;                myWebRequest.CookieContainer = new System.Net.CookieContainer();                WebResponse myWebResponse = myWebRequest.GetResponse();                Stream ReceiveStream = myWebResponse.GetResponseStream();                if (ReceiveStream != null)                {                    StreamReader reader = new StreamReader(ReceiveStream, Encoding.UTF8);                    responseStr = reader.ReadToEnd();                    reader.Close();                }                myWebResponse.Close();  return responseStr;