Event

Abstract

This chapter will discuss the event program. A type that defines an event member allows other types to subscribe for the notification when something happened in the type. We start by designing a type, which, when exposed to the event where subscribers are to subscribe, implements the code to handle the event and explains the concept of the event in C# language. We will then explore the behind the scenes workings of the event, for example, how C# compiler translates an event member to implement, add, and remove a method. We also examine how the subscription operator, for example, += and -=, will be translated to use the add and remove method compiled for the event member by the C# compiler. Finally, we will also explore how different pieces of the event program fit together in runtime.