C # Delegate Events

1. Delegate Event Keyword: delegate

2. When declaring a function, add the following function type

Example: public delegate int Test (int x,int y)

3. Define the delegate variable: Test T1, the delegate receives a method reference.

4. A delegate variable can be called as a function. With Assignment "="

Delegate variable = function name

5. A variable of a delegate type can refer to any method that satisfies the requirement, similar to a C-language function pointer.

6. A delegate variable can use "+ =" to hook up multiple methods, or you can use "-=" to dynamically remove a reference to a method.

7. Delegate variables that refer to multiple methods are called "Multipath delegates."

8. The essential feature of a delegate is one-to-many, one-delegate-to-multiple methods.

C # Delegate Events