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Enabling Multicasting

Recall that .NET delegates have the intrinsic ability to multicast. In other words, a delegate object

can maintain a list of methods to call, rather than a single method. When you wish to add multiple

methods to a delegate object, you simply make use of the overloaded += operator, rather than a

direct assignment. To enable multicasting on the Car type, we could update the OnAboutToBlow()

and OnExploded() methods as follows:

public class Car

{

// Add member to the invocation lists.

public void OnAboutToBlow(AboutToBlow clientMethod)

{ almostDeadList += clientMethod; }

public void OnExploded(Exploded clientMethod)

{ explodedList += clientMethod; }

...

}

With this, the caller can now register multiple targets for the same callback:

class Program

{

static void Main(string[] args)

{

Console.WriteLine("***** Delegates as event enablers *****\n");

Car c1 = new Car("SlugBug", 100, 10);