C#模拟http 发送post或get请求

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