C#模拟http 发送post或get请求的简单实例

private string HttpPost(string Url, string postDataStr)     {       HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);       request.Method = "POST";       request.ContentType = "application/x-www-form-urlencoded";       request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);       request.CookieContainer = cookie;       Stream myRequestStream = request.GetRequestStream();       StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));       myStreamWriter.Write(postDataStr);       myStreamWriter.Close();        HttpWebResponse response = (HttpWebResponse)request.GetResponse();        response.Cookies = cookie.GetCookies(response.ResponseUri);       Stream myResponseStream = response.GetResponseStream();       StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));       string retString = myStreamReader.ReadToEnd();       myStreamReader.Close();       myResponseStream.Close();        return retString;     }      public string HttpGet(string Url, string postDataStr)     {       HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == "" ? "" : "?") + postDataStr);       request.Method = "GET";       request.ContentType = "text/html;charset=UTF-8";        HttpWebResponse response = (HttpWebResponse)request.GetResponse();       Stream myResponseStream = response.GetResponseStream();       StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));       string retString = myStreamReader.ReadToEnd();       myStreamReader.Close();       myResponseStream.Close();        return retString;     }