Recently a co-worker of mine (Lou, smart guy… (Lou, your shameless plug)) needed to test a UI control that raised an event upon certain conditions.  In order to handle this event he needed to have some way to trap that it was raised.  

The solution he came up with was simple and elegant.., use an anonymous delegate.

Here is an example
// Create the UI container that is going to be tested TripZipCodeRouteSelector tripZipCodeRouteSelector = new TripZipCodeRouteSelector(); // Create the local variable to handle the anonymous delegate call bool eventRaised = false; // Wire up the anonymous delegate call tripZipCodeRouteSelector.InValidZipCodeProvided += delegate { eventRaised = true; }; // Run the code that should raise the event tripZipCodeRouteSelector.OnZipCodeChanged( zipCode ); // Assert that the event was raised and it swapped the flag on the bool Assert.AreEqual( true, eventRaised , "The event was not raised.");

I thought this was pretty cool.

Thanks Lou.....:)