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    copied!<p>Finally I get the solution.</p> <p>In a Duplex comunication scenario when a callback is made the server becomes the client and vice versa. </p> <p>So on server side when implementing IServiceBehavior inject the message inspector using the CallbackClientRuntime property of the DispatchRuntime foreach EndpointDispatcher.</p> <pre><code>public void ApplyDispatchBehavior(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase) { foreach (ChannelDispatcher item in serviceHostBase.ChannelDispatchers) { foreach (EndpointDispatcher epd in item.Endpoints) { //injecting an inspector in normal call epd.DispatchRuntime.MessageInspectors.Add(new MessageSizerInspector()); //injecting an inspector in callback epd.DispatchRuntime.CallbackClientRuntime.MessageInspectors.Add(new MessageSizerInspector()); } } } </code></pre> <p>On client side when implementing IEndpointBehavior inject the message inspector using the CallbackDispatchRuntime.</p> <pre><code>public void ApplyClientBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.ClientRuntime clientRuntime) { //injecting an inspector in normal call clientRuntime.MessageInspectors.Add(new MessageSizerInspector()); //injecting an inspector in callback clientRuntime.CallbackDispatchRuntime.MessageInspectors.Add(new MessageSizerInspector()); } </code></pre> <p>Then apply the extension as always. </p> <p>In my case I created a class like the following pseudo code</p> <pre><code>public class MessageSizer : Attribute, IServiceBehavior, IEndpointBehavior { ..... } </code></pre> <p>then I applied this attribute to service implementation for the server side inspection and added a behaviorExtensions inside the app.config to setup the endpoint for message inspection on client side.</p> <pre><code>&lt;system.serviceModel&gt; ........... &lt;client&gt; &lt;endpoint address="net.tcp://localhost/MinerDual.svc" binding="netTcpBinding" bindingConfiguration="wsDualMinerNetTcp" contract="WebApplication.IMinerDual" name="NetTcpMinerDual" behaviorConfiguration="Default" /&gt; &lt;/client&gt; &lt;behaviors&gt; &lt;endpointBehaviors &gt; &lt;behavior name="Default"&gt; &lt;messageSizer/&gt; &lt;/behavior&gt; &lt;/endpointBehaviors&gt; &lt;/behaviors&gt; &lt;extensions&gt; &lt;behaviorExtensions&gt; &lt;add name="messageSizer" type="WCFExtensions.MessageSizerElement, WCFExtensions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"/&gt; &lt;/behaviorExtensions&gt; &lt;/extensions&gt; &lt;/system.serviceModel&gt; </code></pre>
 

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