学步园

                                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\r\n错误信息：" + ex.Message;
            }
        }

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

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