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

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C# / CSharp Tutorial » delegate » delegate 
9.1.6.delegate is a function pointer
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")
9.1.delegate
9.1.1.Define a delegate with no return value and no parameters
9.1.2.Add both static and non-static function to a delegate
9.1.3.Delegate with reference paramemters
9.1.4.Delegate with return values
9.1.5.Use a delegate to call object methods
9.1.6.delegate is a function pointer
9.1.7.A simple delegate example.
9.1.8.Construct a delegate using method group conversion
9.1.9.Delegates can refer to instance methods
9.1.10.Delegates to Instance Members
9.1.11.uses the invocation list to calculate a factorial
9.1.12.named-delegate invocation
9.1.13.Use delegate to reference two static functions
9.1.14.Declare a delegate and assigns a reference to either the WriteLine method or the ShowWindowsMessage method to its delegate instance.
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