What is a delegate in c#

A delegate is a type-safe reference pointing to a method in C# and has the following main functions: allowing the method to execute in an asynchronous or event-driven mode. Provides code modularization and reuse mechanisms. Implement callback function.

Delegates in C

#A delegate is a type-safe reference to a method. It allows methods to be passed as parameters to other methods, thus enabling code reusability and modularity.

Function:

The main function of the delegate is:

• Allow methods to execute in asynchronous or event-driven mode.
• Provides a mechanism to modularize and reuse code.
• Implement the callback function, that is, execute specific code when an event occurs.

Syntax:

The syntax of delegation is as follows:

<code>public delegate <return_type> <delegate_name>(<parameter_list>);</code>

Among them:

• ##< ;return_type>: The type returned by the delegate, which can be any type, including void.
• : The name of the delegate.
• : The parameter list of the delegate method.

Usage:

To use a delegate, you need to perform the following steps:

Declare the delegate type.
1. Create a delegate instance that points to the method to be called.
2. Call the delegate instance just like calling a normal method.

Example:

Here is an example of using a delegate:

// 定义委托类型
public delegate int CalculateDelegate(int a, int b);

// 创建委托实例
CalculateDelegate calculate = (a, b) => a + b;

// 调用委托
int result = calculate(10, 20);

In this example,

CalculateDelegate The delegate type is declared as a method that accepts two integers and returns an integer. Then, a delegate instance calculate is created that points to an anonymous method that adds two integers. Finally, the calculate delegate instance is called, adding the two integers and storing them in the result variable.

The above is the detailed content of What is a delegate in c#. For more information, please follow other related articles on the PHP Chinese website!