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Events Under the Hood

A C# event actually expands into two hidden public methods, one having an add_ prefix, the other

having a remove_ prefix. This prefix is followed by the name of the C# event. For example, the

Exploded event results in two CIL methods named add_Exploded() and remove_Exploded(). In addi-

tion to the add_XXX() and remove_XXX() methods, the CIL-level event definition associates the

correct delegate to a given event.

If you were to check out the CIL instructions behind add_AboutToBlow(), you would find code

that looks just about identical to the OnAboutToBlow() helper method you wrote previously in the

CarDelegate example (note the call to Delegate.Combine()):

.method public hidebysig specialname instance void

add_AboutToBlow(class CarEvents.Car/CarEventHandler 'value')

cil managed synchronized

{

.maxstack  8

ldarg.0

ldarg.0

C H A P T E R   1 1  

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D E L E G AT E S, E V E N T S, A N D   L A M B D A S

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ldfld class CarEvents.Car/CarEventHandler CarEvents.Car::AboutToBlow

ldarg.1

call class [mscorlib]System.Delegate