c# Post 通过HttpWebRequest 网页通信

1. /// <summary>
2.         /// 发送消息到服务器
3.         /// </summary>
4.         /// <param name="xmldata">需要发送的消息</param>
5.         /// <param name="url">服务器地址</param>
6.         /// <returns>服务器返回的消息</returns>
7.         public static string SendByPOST(string xmldata, string url)
8.         {
9.             string sXmlMessage = xmldata;
10.             string DsmpUrl = url;
11.             Encoding encode = System.Text.Encoding.GetEncoding("gb2312");
12.             byte[] arrB = encode.GetBytes(sXmlMessage);
13.             HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(DsmpUrl);
14.             myReq.Method = "POST" ;
15.             myReq.ContentType = "application/x-www-form-urlencoded";
16.             myReq.ContentLength = arrB.Length;
17.             Stream outStream = myReq.GetRequestStream();            
18.             outStream.Write(arrB, 0, arrB.Length);
19.             outStream.Close();
21.             WebResponse myResp = myReq.GetResponse();
22.             Stream ReceiveStream = myResp.GetResponseStream();                
23.             StreamReader readStream = new StreamReader( ReceiveStream, encode);
24.             Char[] read = new Char[256];
25.             int count = readStream.Read(read, 0, 256);
26.             string str = null;
28.             while (count > 0) 
29.             {
30.                 str += new String(read, 0, count);
31.                 count = readStream.Read(read, 0, 256);
32.             } 
34.             readStream.Close();
35.             myResp.Close();
37.             return str;
38.         }