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       static string GetHTML()

        {             string url = "";

            string param = "dayoffset=3&ddate1=2013-01-18&dcityname1=%u5317%u4eac&acityname1=%u4e0a%u6d77";

            Uri uri = new Uri(url);

            WebRequest myReq = WebRequest.Create(uri);

            myReq.Method = "Post";

 

            myReq.Headers.Add("Accept-Encoding", "gzip,deflate,sdch");

            byte[] byData = Encoding.Default.GetBytes(param);  //获取发送字符串编码后的长度

 

            myReq.ContentLength = byData.Length;

            Stream reqStrem = myReq.GetRequestStream(); //返回请求流

            reqStrem.Write(byData, 0, byData.Length);   //在返回的请求流在写入编码后的长度

            reqStrem.Close();

            WebResponse result = myReq.GetResponse();  //返回响应

            Stream recStream = result.GetResponseStream();  //返回响应流

 

            //如果是Gzip方式则需要解压

            recStream = new GZipStream(recStream, CompressionMode.Decompress);

 

                    //初始化StreamReader

            StreamReader redStream = new StreamReader(recStream, System.Text.Encoding.Default);         

 

            string strHTML = redStream.ReadToEnd();  //读取流。转换为字符串

            redStream.Close();

            recStream.Close();

            result.Close();

 

            return strHTML;

        }

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