get请求：

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#region  get请求
        /// 

        /// get请求
        /// 
        /// 请求地址
        /// 请求参数
        /// 
        public static string HttpGet(string Url, string postDataStr)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == "" ? "" : "?") + postDataStr);
            request.Method = "GET";
            request.ContentType = "text/html;charset=UTF-8";
            #region 获取网页内容太大的话,就加下面这两句代码
            request.Headers["Accept-Encoding"] = "gzip,deflate"; 
            request.AutomaticDecompression = DecompressionMethods.GZip;
            #endregion
            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;
        }
        #endregion

post请求：

#region  模拟Post提交
        /// 

        /// 通过POST方式发送数据
        /// 
        /// 请求URL
        /// 请求参数
        /// 
        public static string HttpPost(string url, string strXML)
        {
            try
            {
                Encoding encoding = Encoding.GetEncoding("UTF-8");
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(url));
                byte[] buffer;
                buffer = encoding.GetBytes(strXML);
                request.Method = "Post";
                request.UserAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.137 Safari/537.36 LBBROWSER";
                request.ContentType = "application/json; charset=UTF-8";//application/x-www-form-urlencoded;charset=UTF-8
                request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,p_w_picpath/webp,*/*;q=0.8";
                request.Referer = "http://www.aramex.com/express/track-results.aspx";
                request.ContentLength = buffer.Length;
                Stream postStream = request.GetRequestStream();
                postStream.Write(buffer, 0, buffer.Length);
                postStream.Close();

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();

                //返回信息
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("UTF-8"));
                string strResponse = reader.ReadToEnd();

                reader.Close();
                response.Close();
                return strResponse;
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }
        #endregion

详解请参考：http://www.crifan.com/set_accept_encoding_header_to_gzip_deflate_return_messy_code/

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