C#实现手机端和服务器端的数据交互

1，首先我们必须要引用命名空间  using System.Net;
2，使用该命名空间下的 HttpwebRequest 对象实现请求服务器的页面 例如：
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            request.ContentLength = bytes.Length;
            request.ContentType = "application/x-www-form-urlencoded";
           

3，当我们手机端 需要服务器端相应的消息时，我们可以使用HttpWebResponse 对象来获得相应。
4，获得相应后，我们手机端需要把服务器端相应发送过来的数据流读取出来，因此我们要引用 using System.IO此命名空间下StreamReader 来读取数据流中的数据。例如：
                    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                    StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF7);
                    contentBack = reader.ReadLine();

5，如果我们想向服务器发送数据，就要将数据以流的形式发送到服务器端。例如：
                    Stream requestStream = request.GetRequestStream()
                    requestStream.Write(bytes, 0, bytes.Length);
                    requestStream.Close();

6，现在需要让服务器端的接收到数据 需要用到Request.InputStream 将流读取出来；例如
                Stream str = Request.InputStream;
                int strLen, strRead;
                strLen = System.Convert.ToInt32(str.Length);
                Byte[] strArr = new Byte[strLen];
                strRead = str.Read(strArr, 0, strLen);
                char[] strChar = System.Text.Encoding.Default.GetChars(strArr);
                string s = new String(strChar);

7，这样就实现了手机端和服务器端的数据的交互；

下面是本人写的一段比较通用的函数：供参考

 /// <summary>
        /// 发送文件名称 到服务器端
        /// </summary>
        /// <param name="url">服务器路径</param>
        /// <param name="xml">参数的值</param>
        string contentBack;
        public void PostFileName(string url, string name,string registerNum)
        {
            string postData = name + "&" + registerNum;
            byte[] bytes = Encoding.UTF7.GetBytes(postData);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            request.ContentLength = bytes.Length;
            request.ContentType = "application/x-www-form-urlencoded";

            try
            {
                using (Stream requestStream = request.GetRequestStream())
                {
                    requestStream.Write(bytes, 0, bytes.Length);
                    requestStream.Close();

                    //响应请求
                    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                    StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF7);
                    contentBack = reader.ReadLine();
                    //MessageBox.Show(contentBack, "服务器消息：");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk, MessageBoxDefaultButton.Button1);
            }
        }
服务器端的接受：

                //获得参数的值
                Stream str = Request.InputStream;
                int strLen, strRead;
                strLen = System.Convert.ToInt32(str.Length);
                Byte[] strArr = new Byte[strLen];
                strRead = str.Read(strArr, 0, strLen);
                char[] strChar = System.Text.Encoding.Default.GetChars(strArr);
                string s = new String(strChar);

                if (s =="")
                {
                    return;
                }

                //切割参数
                string[] strArray = s.Split(new char[]{’&’});
                string imei =strArray[0];
                string code =strArray[1];

来源：http://www.haogongju.net/art/959825