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POWCF Call Passing a Null Parameter
 

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    <p>I have a WebHttpBinding WCF service that I am calling. My first POST method send the object correctly, but subsequent calls to POST methods are passing null for the object. </p> <p>Here is my service:</p> <pre><code>public void Update(ObjectDTO objectDTO) { string token = WebOperationContext.Current != null ? WebOperationContext.Current.IncomingRequest.Headers["token"] : string.Empty; //Authentication bool isUserAuthenticatedResult = IsUserAuthenticated(ref token); if (!isUserAuthenticatedResult) return null; //Perform service action MyDtoManager = new MyDtoManager(); objectDTO = MyDtoManager.Update(objectDTO); return objectDTO; } </code></pre> <p>Here is my Service Contract:</p> <pre><code>[ServiceContract] public interface IMyDtoService { [OperationContract] [WebInvoke(Method = "GET", BodyStyle = WebMessageBodyStyle.Bare, ResponseFormat = WebMessageFormat.Json)] List&lt;ObjectDTO&gt; LoadById(string value); [OperationContract] [WebInvoke(Method = "GET", BodyStyle = WebMessageBodyStyle.Bare, ResponseFormat = WebMessageFormat.Json)] List&lt;ObjectDTO&gt; Load(string field, string value); [OperationContract] [WebInvoke(Method="GET", BodyStyle = WebMessageBodyStyle.Bare, ResponseFormat = WebMessageFormat.Json)] List&lt;ObjectDTO&gt; LoadAll(); [OperationContract(Name = "InsertSingle")] [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.Wrapped, ResponseFormat = WebMessageFormat.Json)] ObjectDTO Insert(ObjectDTO objectDto); [OperationContract(Name = "UpdateSingle")] [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.Wrapped, ResponseFormat = WebMessageFormat.Json)] ObjectDTO Update(ObjectDTO objectDto); [OperationContract(Name = "DeleteSingle")] [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.Wrapped, ResponseFormat = WebMessageFormat.Json)] ObjectDTO Delete(ObjectDTO objectDto); } </code></pre> <p>Here is my server configuration:</p> <pre><code>&lt;system.serviceModel&gt; &lt;bindings&gt; &lt;webHttpBinding&gt; &lt;binding name="WebHttpBindingConfig" openTimeout="00:05:00" sendTimeout="00:05:00" maxBufferSize="65536000" maxBufferPoolSize="52428800" maxReceivedMessageSize="65536000" transferMode="Buffered"&gt; &lt;readerQuotas maxDepth="32" maxStringContentLength="65536000" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /&gt; &lt;security&gt; &lt;transport /&gt; &lt;/security&gt; &lt;/binding&gt; &lt;/webHttpBinding&gt; &lt;/bindings&gt; &lt;services&gt; &lt;service behaviorConfiguration="Services.ServiceBehavior" name="Services.MyDtoService"&gt; &lt;endpoint address="" behaviorConfiguration="HttpBehavior" binding="webHttpBinding" name="Services.MyDtoService" contract="ServiceInterfaces.IMyDtoService"&gt; &lt;identity&gt; &lt;dns value="localhost" /&gt; &lt;/identity&gt; &lt;/endpoint&gt; &lt;endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /&gt; &lt;/service&gt; &lt;/services&gt; &lt;behaviors&gt; &lt;serviceBehaviors&gt; &lt;behavior name="Services.ServiceBehavior"&gt; &lt;serviceMetadata httpGetEnabled="true" /&gt; &lt;serviceDebug includeExceptionDetailInFaults="false" /&gt; &lt;/behavior&gt; &lt;/serviceBehaviors&gt; &lt;endpointBehaviors&gt; &lt;behavior name="HttpBehavior"&gt; &lt;webHttp /&gt; &lt;/behavior&gt; &lt;/endpointBehaviors&gt; &lt;/behaviors&gt; &lt;/system.serviceModel&gt; </code></pre> <p>And finally my client code making the call:</p> <pre><code>IMyDtoService myDtoService = new WebChannelFactory&lt;IMyDtoService&gt;(BindingConfig, new Uri("http://localhost:8080/MyDtoService.svc")).CreateChannel(); using (new OperationContextScope((IClientChannel)myDtoService)) { if (WebOperationContext.Current != null) WebOperationContext.Current.OutgoingRequest.Headers.Add("token", tokenResult.Result); ObjectDTO insertResult = ipAddressService.Insert(new ObjectDTO { ObjectGuid = Guid.NewGuid(), IsAllow = true, Identifier = 1, IdentifierType = 0, StartIpAddress = "192.168.0.1" }); List&lt;ObjectDTO&gt; loadByIdResult1 = myDtoService.LoadById(insertResult.ObjectGuid.ToString()); Console.WriteLine("Insert Found: " + loadByIdResult1.Count); insertResult.IsAllow = false; ObjectDTO updateResult = ipAddressService.Update(insertResult); } </code></pre> <p>As you can see my client code calls my WCF service and the insert method works perfectly fine and I can see the persisted object in my database. However on the update, the ObjectDTO parameter is null. If I load an existing object and perform an update it works perfectly. It appears to be an issue with subsequent calls to the WCF service using POST methods. I do not have this problem with GET methods.</p>
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    1. CODoing some testing, if I move my Update call to it's own: using(new OperationalContextScope((IClientChannel)myDtoService)) then both my Insert and Update methods work. If my Update method remains the way it is in my posted example, then the Update method gets a null value for the ObjectDTO parameter. Can anyone explain why?
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