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There s good reason for the similarities in the behaviors of delegates and events. An event contains a private delegate, as illustrated in Figure 16-2. The important things to know about an event s private delegate are the following: An event gives structured access to its privately controlled delegate. Unlike the many operations available with a delegate, with an event you can only add, remove, and invoke event handlers. When an event is raised, it invokes the delegate, which sequentially calls the methods in the invocation list.

To keep more customers, Web retailers have had to change their ways. To attract and hold customers, Brooks used a service called the Angara Reporter that collected demographic information, such as age, gender, and location, from At Home Corp. s MatchLogic.com and Engage Inc. visitor pro les to create a rough idea of the kinds of customers who visit particular types of sites. Brooks used this information to personalize the content that visitors saw and to tailor offers on the basis of the pro les. Angara s pro le was based on a database of 100 million Web visitors. Visitors to Brooks s site were sorted by the site s best guess as to gender, marital status, and geography. Different visitors saw different home pages. A woman visitor would see a different page from that

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Notice in Figure 16-2 that only the += and -= operators are sticking out to the left of the event. This is because they are the only operations allowed on an event.

Figure 16-2. An event has an encapsulated delegate Figure 16-3 illustrates the runtime view of a publisher class with an event called Elapsed. ClassA and ClassB, on the right, each has an event handler registered with Elapsed. Inside the event you can see the delegate referencing the two event handlers. Besides the event, the publisher also contains the code that raises the event.

shown to a man. An unmarried younger man might see a different page from that shown to an older male. Brooks expected that this feature would offer a level of personalization that its regular stores could not match. Yet, as of this writing, Brooks has yet to make a pro t. What can we learn from this There are many very sophisticated and clever things that you can do using a database to create sales to consumers on the Web that you could not possibly do in regular merchandising. These things all cost money. Total Web sales are very tiny in comparison to retail sales. These clever things have yet to produce a lasting pro t for anyone. Anyone trying to sell consumer products on the Web (with a few exceptions, such as Amazon and eBay) is going to lose money for the foreseeable future.

Five components of code need to be in place to use events. I ll cover each of them in the following sections, and they are illustrated in Figure 16-4. These components are the following: Delegate type declaration: The event and the event handlers must have a common signature and return type, which is described by the delegate type declaration. Event handler declarations: These are the declarations in the subscriber classes of the methods (event handlers) to be executed when the event is raised. These do not have to be separate methods. They can be anonymous methods or lambda expressions. Event declaration: This is the declaration in the publisher class of the event that holds and invokes the event handlers. Event registration: This is the code that connects the event handlers to the event. Code that raises the event: This is the code in the publisher that calls the event, causing it to invoke its event handlers.

You will make both your camera components subscribe to the same interface, such as the (selfdefined) ICameraInterface interface. When you initialize your camera component, you let your Game class know that from now on the Game contains a component that implements the ICameraInterface interface. In XNA words, the component registers itself as the GameService of the ICameraInterface type.

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