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Source Code

The PublicDelegateProblem project is located under the Chapter 11 subdirectory.

The Event Keyword

As a shortcut to having to build custom methods to add or remove methods to a delegate’s invoca-

tion list, C# provides the event keyword. When the compiler processes the event keyword, you are

automatically provided with registration and unregistration methods as well as any necessary mem-

ber variables for your delegate types. These delegate member variables are

always declared private,

and therefore they are not directly exposed from the object firing the event. To be sure, the event

keyword is little more than syntactic sugar in that it simply saves you some typing time.

Defining an event is a two-step process. First, you need to define a delegate that will hold the

list of methods to be called when the event is fired. Next, you declare an event (using the C# event

keyword) in terms of the related delegate.

To illustrate the event keyword, this iteration of the Car type will define two events (named

identically to the previous AboutToBlow and Exploded delegates). These events are associated to a

single delegate type named CarEventHandler. Here are the initial updates to the Car type:

public class Car

{