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// Just to be safe, perform a

// runtime check before casting.

if (sender is Car)

{

Car c = (Car)sender;

c.CrankTunes(false);

}

Console.WriteLine("Critical Message from {0}: {1}", sender, e.msg);

}

■

Source Code

The PrimAndProperCarEvents project is located under the Chapter 11 subdirectory.

The Generic EventHandler Delegate

Given that so many custom delegates take an object as the first parameter and an EventArgs

descendent as the second, you could further streamline the previous example by using the generic

EventHandler type, where T is your custom EventArgs type. Consider the following update to the

Car type (notice how we no longer need to build a custom delegate type at all):

public class Car

{

public event EventHandler Exploded;

public event EventHandler AboutToBlow;

...

}

The Main() method could then make use of EventHandler anywhere we previ-

ously specified CarEventHandler:

static void Main(string[] args)

{

Console.WriteLine("***** Prim and Proper Events *****\n");

// Make a car as usual.

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