Wcf Message Inspector - IMessageInspector

You can use message inspector to log, inspect, modify or completely replace a message by implementing IClientMessageInspector (client side) or IDispatchMessageInspector (server side)

 #region IDispatchMessageInspector Implementation

 public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
 {
  //You can access the body of a Message only once, regardless of how it is accessed.
  //http://msdn.microsoft.com/en-us/library/ms734675.aspx
  request = LogMessage(request.CreateBufferedCopy(int.MaxValue));
  return null;
 }

 #endregion

 

Now this can be added through Endpoint/Service/Contract behavior

 
  public class LogMessageEndpointBehavior : Attribute, IEndpointBehavior
 {
        public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
        {
            endpointDispatcher.DispatchRuntime.MessageInspectors.Add(new LoggingMessageInspector());
        }

 }