Delegates and Events

Delegates and Events

In C#, a delegate is a type that defines a method signature and can be used to refer to methods with that signature. Delegates are often used as a way to implement callbacks, where a method is passed as a parameter to another method that can then call it. Delegates can also be used to create event handlers, which are methods that are called in response to events raised by an object.

Events, on the other hand, are a language feature in C# that allow objects to notify other objects when something of interest happens. An event is declared using the event keyword and consists of a delegate type that defines the signature of the methods that will handle the event. When an event is raised, all of the registered event handlers are called in order.

Together, delegates and events provide a powerful mechanism for implementing callback and event handling functionality in C#. By using delegates to define method signatures and events to trigger those methods, C# code can be written in a more modular and extensible way.