Delegate in C#

summer · Posted on 2/7/2019 9:08:45 PM

1. What is entrustment?

A delegate is a reference type, which is a managed version of a function pointer. In C#, delegates are a type that stores references as functions. Delegates can reference both instances and static methods, while function pointers can only reference static methods. The delegate declaration is very similar to a function, unlike a function in that the delegate does not have a function body and requires the Delegate keyword. The delegated declaration specifies a function signature that contains a list of parameters and a return type. Once the delegate is defined, a variable of the delegate type can be declared, which can then be initialized as referenced by a function with the same signature as the delegate, which can then be called using the delegate variable. (ps: In fact, he entrusted him with a class, and his purpose was to pass the method as a parameter to other methods!) ）

Delegates, while very similar to function pointers, are not pointers. Many people put . The delegate in .NET is understood as a safe function pointer, which is far-fetched, and the function pointer of the delegate implementation is very similar in that it provides a program callback mechanism.

2. Four steps of entrustment: 1. Declare the type of entrustment

  2. There is a method that contains the code to be executed

  3. Create a delegated instance

  4. Call the delegate instance

3. Examples:

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[Communication] Delegate in C#

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