Events

Abstract

The preceding chapter covered delegates. Many aspects of events are similar to those of delegates. In fact, an event is like a simpler delegate that is specialized for a particular use. Figure 16-1 illustrates that, like a delegate, an event has methods registered with it and invokes those methods when it is invoked. The following are some important terms related to events:

• Raising an event: The term for invoking or firing an event. When an event is raised, all the methods registered with it are invoked—in order.

• Publisher: A class or struct that makes an event available to other classes or structs for their use.

• Subscriber: A class or struct that registers methods with a publisher.

• Event handler:: A method that is registered with an event. It can be declared in the same class or struct as the event or in a different class or struct.