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    <p>Yes, it is possible to encapsulate this kind of logging, using the <a href="http://msdn.microsoft.com/en-us/magazine/cc163302.aspx" rel="nofollow noreferrer">extensibility points built into WCF</a>. There are actually multiple possible approaches. The one I'm describing here adds an <code>IServiceBehavior</code>, which uses a custom <a href="http://msdn.microsoft.com/en-us/library/system.servicemodel.dispatcher.ioperationinvoker.aspx" rel="nofollow noreferrer"><code>IOperationInvoker</code></a>, and does not require any web.config modifications.</p> <p>There are three parts to this.</p> <ol> <li>Create an implementation of <code>IOperationInvoker</code>, which wraps the method invocation in the required logging and error-handling.</li> <li>Create an implementation of <code>IOperationBehavior</code> that applies the invoker from step 1.</li> <li>Create an <code>IServiceBehavior</code>, which inherits from <code>Attribute</code>, and applies the behavior from step 2.</li> </ol> <h3>Step 1 - IOperationInvoker</h3> <p>The crux of <a href="http://msdn.microsoft.com/en-us/library/system.servicemodel.dispatcher.ioperationinvoker.aspx" rel="nofollow noreferrer">IOperationInvoker</a> is the <code>Invoke</code> method. My class wraps the base invoker in a try-catch block:</p> <pre><code>public class LoggingOperationInvoker : IOperationInvoker { IOperationInvoker _baseInvoker; string _operationName; public LoggingOperationInvoker(IOperationInvoker baseInvoker, DispatchOperation operation) { _baseInvoker = baseInvoker; _operationName = operation.Name; } // (TODO stub implementations) public object Invoke(object instance, object[] inputs, out object[] outputs) { MyInfrastructure.LogStart(_operationName, inputs); try { return _baseInvoker.Invoke(instance, inputs, out outputs); } catch (Exception ex) { MyInfrastructure.LogError(_operationName, inputs, ex); return null; } MyInfrastructure.LogEnd("Add", parameters); } } </code></pre> <h3>Step 2 - IOperationBehavior</h3> <p>The implementation of <a href="http://msdn.microsoft.com/en-us/library/system.servicemodel.description.ioperationbehavior.aspx" rel="nofollow noreferrer">IOperationBehavior</a> simply applies the custom dispatcher to the operation.</p> <pre><code>public class LoggingOperationBehavior : IOperationBehavior { public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation) { dispatchOperation.Invoker = new LoggingOperationInvoker(dispatchOperation.Invoker, dispatchOperation); } // (TODO stub implementations) } </code></pre> <h3>Step 3 - IServiceBehavior</h3> <p>This implementation of <code>IServiceBehavior</code> applies the operation behavior to the service; it should inherit from <code>Attribute</code> so that it can be applied as an attribute to the WCF service class. The implementation for this is standard.</p> <pre><code>public class ServiceLoggingBehavior : Attribute, IServiceBehavior { public void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { foreach (ServiceEndpoint endpoint in serviceDescription.Endpoints) { foreach (OperationDescription operation in endpoint.Contract.Operations) { IOperationBehavior behavior = new LoggingOperationBehavior(); operation.Behaviors.Add(behavior); } } } } </code></pre>
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    1. CO+1. This is what I have done in a past project too. It works well.
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    2. COIt fails in operation.Behaviors.Add when I have more than one endpoints. Probably we should get operations collection only from 1st endpoint or check whether this behavior is already added...
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      1. USPuterdo Borato
 

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