C#模拟http 发送post或get请求

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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;         }

　　

在post的时候有时也用的到cookie，像登录163发邮件时候就需要发送cookie，所以在外部一个cookie属性随时保存 CookieContainer cookie = new CookieContainer();

！注意：有时候请求会重定向，但我们就需要从重定向url获取东西，像QQ登录成功后获取sid，但上面的会自动根据重定向地址跳转。我们可以用:
request.AllowAutoRedirect = false;设置重定向禁用，你就可以从headers的Location属性中获取重定向地址