如何使用WCF Rest serice从客户端调用WCF Post方法

---WCF Implementation of Interface public string UpdateTrackDetails(string trackdetails) { string time = ""; DateTime dt = new DateTime(); try { // System.Web.Script.Serialization.JavaScriptSerializer json = new System.Web.Script.Serialization.JavaScriptSerializer(); string result = "0"; TrackDetails _BusTrack = JsonConvert.DeserializeObject<trackdetails>(trackdetails); time = _BusTrack.TrackTime; string daa = Convert.ToDateTime(time).ToString("dd/MM/yyyy"); dt = Convert.ToDateTime(daa); using (var context = new SchoolBusTrackEntities()) { context.BusTrackDetails.Add( new BusTrackDetail { BusID = Convert.ToInt32(_BusTrack.BusID), Latitude = _BusTrack.Latitude, Longitude = _BusTrack.Longitude, // TrackTime = DateTime.Now TrackTime = dt, TrackTime1 = time } ); result = context.SaveChanges().ToString(); } return "result"; } catch (Exception ex) { return ex.Message; } } ---WCF Config File <system.servicemodel> <services> <service name="BusTrackService.SchoolBusTrack" behaviorconfiguration="ServiceBehavior"> <endpoint address="" binding="webHttpBinding" contract="BusTrackService.ISchoolBusTrack" behaviorconfiguration="Web"> <identity> <dns value="localhost"> <endpoint name="mexHttpBinding"> address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> <behaviors> <servicebehaviors> <behavior name="ServiceBehavior"> <datacontractserializer maxitemsinobjectgraph="10000000"> <servicemetadata httpgetenabled="true"> <servicedebug includeexceptiondetailinfaults="false"> <behavior> <servicemetadata httpgetenabled="true"> <servicedebug includeexceptiondetailinfaults="false"> <endpointbehaviors> <behavior name="Web"> <datacontractserializer maxitemsinobjectgraph="10000000"> <webhttp helpenabled="true" defaultoutgoingresponseformat="Json" defaultbodystyle="Bare" automaticformatselectionenabled="true"> <!--<webhttp>--> <bindings> <webhttpbinding> <binding maxreceivedmessagesize="2147483647"> <readerquotas maxarraylength="2147483647" maxstringcontentlength="2147483647"> <servicehostingenvironment multiplesitebindingsenabled="true"> <system.webserver> <modules runallmanagedmodulesforallrequests="true"> <!-- To browse web app root directory during debugging, set the value below to true. Set to false before deployment to avoid disclosing web app folder information. --> <directorybrowse enabled="true"> <system.diagnostics> <trace autoflush="true"> <sources> <source name="System.ServiceModel" /> switchValue="Information, ActivityTracing" propagateActivity="true"> <listeners> <add name="sdt"> type="System.Diagnostics.XmlWriterTraceListener" initializeData="serviceLog3.xml" /> ----My Client Calling Method public string call1() { string sURL = "localhost:52305/SchoolBusTrack.svc/UpdateTrackDetails"; BusTrack1 _test = new BusTrack1(); _test.BusID = txtBusID.Text; _test.Latitude = txtLatitude.Text; _test.Longitude = txtLongitude.Text; _test.TrackTime = txtTrackTime.Text; _test.TrackTime1 = txtTrackTime1.Text; string JsonString = new JavaScriptSerializer().Serialize(_test); var httpWebRequest = (HttpWebRequest)WebRequest.Create(sURL); httpWebRequest.ContentType = "text/json"; httpWebRequest.Method = "POST";//GET string responseText = ""; using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream())) { streamWriter.Write(JsonString);//any parameter } var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse(); using (var streamReader = new StreamReader(httpResponse.GetResponseStream())) { responseText = streamReader.ReadToEnd(); } return responseText; } ---calling Differnt way in client side string reqUrl = "192.168.1.46/BusWCF/SchoolBusTrack.svc/UpdateTrackDetails"; BusTrack1 _Bus = new BusTrack1(); _Bus.BusID = BusID; _Bus.Latitude = Latitude; _Bus.Longitude = Longitude; _Bus.TrackTime = TrackTime; _Bus.TrackTime1 = TrackTime1; var JsonString = new JavaScriptSerializer().Serialize(_Bus); // Response.Write(JsonString); byte[] bytes = new UTF8Encoding().GetBytes(JsonString.ToString()); WebRequest request = WebRequest.Create(reqUrl); request.Timeout = 2000; request.Method = "POST"; request.ContentType = "application/json; charset=utf-8"; request.ContentLength = bytes.Length; using (StreamWriter writer = new StreamWriter(request.GetRequestStream())) { writer.Write(JsonString); } WebResponse responce = request.GetResponse(); Stream reader = responce.GetResponseStream(); StreamReader sReader = new StreamReader(reader); string outResult = sReader.ReadToEnd(); sReader.Close(); but i got the error The remote server returned an error: (400) Bad Request. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Net.WebException: The remote server returned an error: (400) Bad Request. please tel what is my error.. Thanks and Regards