Post方式调用wcf服务

      我们平常在PC端调用WCF服务，只要知道WCF服务的地址，客户端直接添加引用服务就可以使用了，殊不知还有其他方式，其实，我们也可以

通过HTTP POST的方式调用WCF服务，这样就不用添加引用了，在手机移动端开发后台服务，都是通过Post的形式调用WCF服务，当然，这种方式在PC也可以使用。

               我们来看下面的一个简单示例。下面的示例演示了服务器端和客户端的简单通讯

               服务器端返回一个JSON字符串，代码如下

              契约定义

[OperationContract]
       [WebInvoke(UriTemplate = "AddData", Method = "POST", RequestFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Bare, ResponseFormat = WebMessageFormat.Json)]
       string AddData(Stream stream);

          契约实现

public string AddData(Stream stream)
   {
       StreamReader sr = new StreamReader(stream);
       string s = sr.ReadToEnd();
       sr.Dispose();
       NameValueCollection nvc = HttpUtility.ParseQueryString(s);

       string appKey = nvc["appKey"];
       string sign = nvc["sign"];
       string name=nvc["username"];

       var result = new ErrorModel
       {
           IsError = true,
           ErrorCode = -2,
           ErrorMsg = "操作信息",
       };
       return new JavaScriptSerializer().Serialize(result);
   }

                  客户端调用

            

public static string postSend(string url, string param)
       {
           Encoding myEncode = Encoding.GetEncoding("UTF-8");
           byte[] postBytes = Encoding.UTF8.GetBytes(param);

           HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
           req.Method = "POST";
           req.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
           req.ContentLength = postBytes.Length;

           try
           {
               using (Stream reqStream = req.GetRequestStream())
               {
                   reqStream.Write(postBytes, 0, postBytes.Length);
               }
               using (WebResponse res = req.GetResponse())
               {
                   using (StreamReader sr = new StreamReader(res.GetResponseStream(), myEncode))
                   {
                       string strResult = sr.ReadToEnd();
                       return strResult;
                   }
               }
           }
           catch (WebException ex)
           {
               return "无法连接到服务器
错误信息：" + ex.Message;
           }
       }

               

string param = "appKey=44hbf622op&username=13011001233&sign=123456";

            postSend("http://localhost:17446/CusDataService.svc/AddData", param);