Delegates and Events
Delegates
In C#, a delegate is a reference type variable that holds the reference to a method. It provides a way to pass methods as parameters. Delegates are type-safe, meaning that a delegate points to methods with a particular parameter list and return type.
Here's how you can declare a delegate:
public delegate int BinaryOperator(int a, int b);
In this example, BinaryOperator is a delegate that can reference any method that takes two integers as parameters and returns an integer. Here's how to use it:
Events
Events in C# are a way for a class to provide notifications to clients of that class when some interesting thing happens to an object. The most familiar use for events is in graphical user interfaces; typically, the classes that describe controls in a UI have events that are fired when the user does something to the control (for example, click a button).
Events are declared using delegates. Here's how you can declare an event:
In this example, Clicked is an event that is fired when the Click method is called. Here's how to subscribe to this event:
