CHAPTER 27

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Events

Events enable an object to notify other objects when something of interest occurs. The object that raises the event is called the publisher and the objects that handle the event are called subscribers.

Publisher

To demonstrate the use of events the publisher will be created first. This will be a class that inherits from ArrayList, but this version will raise an event whenever an item is added to the list. Before the event can be created a delegate is needed that will hold the subscribers. This could be any kind of delegate, but the standard design pattern is to use a void delegate that accepts two parameters. The first parameter ...

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