Exam Ref 70-483: Programming in C#

Objective 1.4: Create and implement events and callbacks

An event can be used to provide notifications. You can subscribe to an event if you are interested in those notifications. You can also create your own events and raise them to provide notifications when something interesting happens. The .NET Framework offers built-in types that you can use to create events. By using delegates, lambda expressions, and anonymous methods, you can create and use events in a comfortable way.

This objective covers how to:

• Understand delegates.

• Use lambda expressions.

• Create and raise events.

Understanding delegates

In C#, delegates form the basic building blocks for events. A delegate is a type that defines a method signature. In C++, for example, you would do this ...