This print for content only-size & color not accurate 7" X 9-1/4" / casebound / malloy

// Register multiple event handlers!

c1.OnAboutToBlow(new Car.AboutToBlow(CarAboutToBlow));

c1.OnAboutToBlow(new Car.AboutToBlow(CarIsAlmostDoomed));

c1.OnExploded(new Car.Exploded(CarExploded));

...

}

// Car will call these.

public static void CarAboutToBlow(string msg)

{ Console.WriteLine(msg); }

public static void CarIsAlmostDoomed(string msg)

{ Console.WriteLine("Critical Message from Car: {0}", msg); }

public static void CarExploded(string msg)

{ Console.WriteLine(msg); }

}

In terms of CIL code, the += operator resolves to a call to the static Delegate.Combine() method

(in fact, you could call Delegate.Combine() directly, but the += operator offers a simpler alternative).

Ponder the following CIL implementation of OnAboutToBlow():

.method public hidebysig instance void OnAboutToBlow

(class CarDelegate.Car/AboutToBlow clientMethod) cil managed

{

.maxstack  8

C H A P T E R   1 1  

■

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

351

8849CH11.qxd  10/1/07  10:43 AM  Page 351

---

ldarg.0

dup

ldfld class CarDelegate.Car/AboutToBlow CarDelegate.Car::almostDeadList

ldarg.1