理角C#中的delegate

C#中的delegate其實就相當於delphi中的方法類，是C#中事件處理的基礎，如下例：
using System;
// Declare delegate -- defines required signature:
delegate void SampleDelegate(string message);

class MainClass
{
    // Regular method that matches signature:
    static void SampleDelegateMethod(string message)
    {
        Console.WriteLine(message);
    }

    static void Main()
    {
        // Instantiate delegate with named method:
        SampleDelegate d1 = SampleDelegateMethod;
        // Instantiate delegate with anonymous method:
        SampleDelegate d2 = delegate(string message)
        {
            Console.WriteLine(message);
        };

        // Invoke delegate d1:
        d1("Hello");
        // Invoke delegate d2:
        d2(" World");
        Console.ReadLine();
    }
}
轉換成delphi就是：
interface
type
TSampleDelegate = procedure(message: string) of Object;
...
procedure showmessage(message: string);

implements

procedure myclass.showmessage(message: string);
begin
  writenln('message');
end;
...
d1,d2: TSampleDelegate:
...
//Invoke Delegate d1:
d1 := myclass.showmessage;
d1('hello');
//Invoke Delegate d2:
d2 := myclass.showmessage;
dl('world');