Delegate Types in C#

Delegate, a keyword, is used to create method objects. With the Invoke method we can call a delegate as a method. And we can pass the delegate as an argument to another method. A delegate is a higher-order procedure.
Example. This program declares a delegate type D that receives a string, and returns no value. In Main, we create an instance of type D. We specify the method body with a lambda expression.

Then:We call the delegate D method implementation with the argument "cat" using the Invoke method. This is appropriate for the Internet.

Tip:This program uses the "delegate" keyword. But many programs use higher-order procedures with just lambda expressions.

Based on: .NET 4.5

C# program that uses delegate

using System;

class Program
{
    delegate void D(string value);

    static void Main()
    {
        // ... Specify delegate with lambda expression.
        D d = v => Console.WriteLine(v);
        // ... Invoke delegate.
        d.Invoke("elephent");
    }
}

Output

elephent