delegate is a function pointer : delegate « delegate « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. delegate
3. delegate

using System;

class MainClass
{
  delegate int MyDelegate(string s);
  static void Main(string[] args)
  {
    MyDelegate Del1 = new MyDelegate(DoSomething);
    MyDelegate Del2 = new MyDelegate(DoSomething2);

    string MyString = "Hello World";

    Del1(MyString);
    Del2(MyString);

  }

  static int DoSomething(string s)
  {
    Console.WriteLine("DoSomething");
    
    return 0;
  }
  static int DoSomething2(string s)
  {
      Console.WriteLine("DoSomething2");
    return 0;
  }
}

DoSomething
DoSomething2

using System;

public class Machine
{
    string name;
    public Machine(string name)
    {
        this.name = name;
    }    
    public void Process(string message)
    {
        Console.WriteLine("{0}: {1}", name, message);
    }
}

class Test
{
    delegate void ProcessHandler(string message);
    
    static public void Process(string message)
    {
        Console.WriteLine("Test.Process(\"{0}\")", message);
    }
    public static void Main()
    {
        Machine computer = new Machine("Computer");
        
        ProcessHandler ph = new ProcessHandler(computer.Process);
        ph = (ProcessHandler) Delegate.Combine(ph, new ProcessHandler(Process));
        
        ph("compile");        
    }
}

Computer: compile
Test.Process("compile")