title: ServiceHost message receive event?
body: <p>Surely there must be an event to attach onto before a ServiceHost or Channel or Dispatcher handles a message? I'm assuming it can be accessed through OperationContext.Current, but the closest events I can find are Opening and Closing. Is there something like a MessageReceived or BeforeMessageProcessed event? </p>
  
  <p>If not using events, is there some other way using WCF classes/configuration to determine if a ServiceHost SingletonInstance is currently processing a DataContract?</p>
  
  <p>EDIT: IDispatchMessageInspector (AfterReceiveRequest and BeforeSendReply) is perfect. I have about 8 services and need to know what messages (DataContracts) they are currently processing. While it would be possible to use something like a helper method that takes a delegate and does BeforeReceive(); InvokeDelegate(); AfterReceive(); it's far easier to use IDispatchMessageInspector and behaviors.</p>