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    <p>At first glance there are three problems with your code:</p> <p>1: you should use the <a href="http://msdn.microsoft.com/en-us/library/system.servicemodel.serviceknowntypeattribute.aspx" rel="nofollow noreferrer">ServiceKnownTypeAttribute</a> to specify known types when exposing only base types in your operation contracts:</p> <pre><code>[ServiceContract(Namespace = "yyyWCF")] public interface IClientBroker { [OperationContract] [ServiceKnownType(typeof(Client))] [WebInvoke( Method="GET", BodyStyle=WebMessageBodyStyle.WrappedRequest, ResponseFormat=WebMessageFormat.Json)] IClient GetClientJson(int clientId); } </code></pre> <p>2: You should use <code>WebMessageBodyStyle.WrappedRequest</code> instead of <code>WebMessageBodyStyle.Wrapped</code> because the latter is not compatible with <a href="http://msdn.microsoft.com/en-us/library/system.servicemodel.activation.webscriptservicehostfactory.aspx" rel="nofollow noreferrer">WebScriptServiceHostFactory</a>.</p> <p>3: IMHO using Method="GET" would be more RESTful for a method called GetClientJson than Method="POST"</p> <p>Another advice I could give you when working with WCF services is to use <a href="http://msdn.microsoft.com/en-us/library/ms732023.aspx" rel="nofollow noreferrer">SvcTraceViewer.exe</a> bundled with Visual Studio. It is a great tool for debugging purposes. All you need is to add the following section to your app/web.config:</p> <pre><code> &lt;system.diagnostics&gt; &lt;sources&gt; &lt;source name="System.ServiceModel" switchValue="Information, ActivityTracing" propagateActivity="true"&gt; &lt;listeners&gt; &lt;add name="sdt" type="System.Diagnostics.XmlWriterTraceListener" initializeData= "WcfDetailTrace.e2e" /&gt; &lt;/listeners&gt; &lt;/source&gt; &lt;/sources&gt; &lt;/system.diagnostics&gt; </code></pre> <p>Then invoke the web method and WcfDetailTrace.e2e file will be generated in your web site root directory. Next open this file with SvcTraceViewer.exe and you will see lots of useful information. For example it could say:</p> <blockquote> <p>Cannot serialize parameter of type 'MyNamespace.Client' (for operation 'GetClientJson', contract 'IClientBroker') because it is not the exact type 'MyNamespace.IClient' in the method signature and is not in the known types collection. In order to serialize the parameter, add the type to the known types collection for the operation using ServiceKnownTypeAttribute.</p> </blockquote> <p>Of course you should not forget commenting this section before going into production or you might end up with some pretty big files.</p>
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    1. COThank Darin, It turns out my problem is with JSON serializing Entity Framework objects (blogged: http://tinyurl.com/cc4k37). But your tip about SvcTraceViewer was invaluable in reminding me of this great tool and also spotting the exception. Also: Agreed about REST for some methods, just not this 1!
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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