C# 中的委派 (Delegation)

委派

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");
    }
}

事件

C#物件 事件 委派 撰寫 範例
using System;
using System.Collections.Generic;
using System.Text;
namespace eventSimple
{
    class Program
    {
        delegate void myFunction(string text);
        static event myFunction readKeyEvent;
        static void Main(string[] args)
        {
            readKeyEvent += new myFunction(myFunction1);
            Console.WriteLine("請輸入一字串");
            string text = Console.ReadLine();
            Console.WriteLine();
            Console.WriteLine("第一次觸發事件");
            readKeyEvent.Invoke(text);
            Console.WriteLine();
            readKeyEvent += new myFunction(myFunction2);
            Console.WriteLine("請輸入一字串");
            text = Console.ReadLine();
            Console.WriteLine();
            Console.WriteLine("第二次觸發事件");
            readKeyEvent.Invoke(text);
            Console.WriteLine();
            Console.WriteLine("按任意鍵離開");
            Console.ReadKey();
        }
        static void myFunction1(string text)
        {
            Console.WriteLine("這次第一次執行的函數");
            Console.WriteLine("參數="+text);
        }
        static void myFunction2(string text)
        {
            Console.WriteLine("這次第二次執行的函數");
            Console.WriteLine("參數=" + text);
        }
      }
}