委托（C#）

using System;  
using System.Collections.Generic;
using System.Text; 
 
namespace Delegate 
{ 
    //定义委托，它定义了可以代表的方法的类型  
    public delegate void GreetingDelegate(string name);    
    class Program 
    {   
        private static void EnglishGreeting(string name) 
        { 
            Console.WriteLine("Morning, " + name); 
        }  
        private static void ChineseGreeting(string name)
        { 
            Console.WriteLine("早上好, " + name);
        }   
        //注意此方法，它接受一个GreetingDelegate类型的方法作为参数  
        private static void GreetPeople(string name, GreetingDelegate MakeGreeting)
        {  
            MakeGreeting(name); 
        }   
        static void Main(string[] args) 
        {  
            GreetPeople("Jimmy Zhang", EnglishGreeting); 
            GreetPeople("张子阳", ChineseGreeting); 
            Console.ReadKey(); 
        } 
    }
} 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {

        static void Main(string[] args)
        {
            King king = new King();
            king.handMinisterOneYearDo(ministerA.AMinisterOneYearDo);
            king.handMinisterOneYearDo(ministerB.BMinisterOneYearDo);
            king.handMinisterOneYearDo(ministerC.CMinisterOneYearDo);
            Console.ReadLine();
        }
    }
     class King
    {
        public delegate MinisterReturns MinisterReturnsDelegate();
        private string command = "我给你们每个人十个金币，你们离开王宫一年，看看你们可以用这十个金币为我带来些什么。";
        public King()
        {
            Console.WriteLine(command);
        }
        public void handMinisterOneYearDo(MinisterReturnsDelegate action)
        {
            MinisterReturns pMinisterReturns = action();
            if (pMinisterReturns is GoldCoins)
            {
                switch (((GoldCoins)pMinisterReturns).GoldCoinsCount)
                {
                    case 100:
                        Console.WriteLine("国王听后非常高兴，多奖励100金币");
                        break;
                    case 10:
                        Console.WriteLine("国王很不高兴，贬为平民");
                        break;
                }
            }
            if (pMinisterReturns is goods)
            {
                Console.WriteLine("多奖励10金币");
            }
        }
    }

    class MinisterReturns
    {
    }
    class GoldCoins : MinisterReturns
    {
        private int _GoldCoinsCount;

        public int GoldCoinsCount
        {
            get { return _GoldCoinsCount; }
        }
        public GoldCoins(int count)
        {
            this._GoldCoinsCount = count;
        }
    }
    class goods : MinisterReturns
    {
        private string _good = "精美的商品";

        public string Good
        {
            get { return _good; }
        }
    }

    class ministerA
    {
        public static GoldCoins AMinisterOneYearDo()
        {
            GoldCoins p = new GoldCoins(100);
            Console.WriteLine("我是大臣A，我给国王带来了100金币！");
            return p;
        }
    }
    class ministerB
    {
        public static goods BMinisterOneYearDo()
        {
            goods d = new goods();
            Console.WriteLine("我是大臣B，我给国王带来了精美礼品！");
            return d;
        }
    }
    class ministerC
    {
        public static GoldCoins CMinisterOneYearDo()
        {
            GoldCoins p = new GoldCoins(10);
            Console.WriteLine("我是大臣C，这一年他没有离开本国，为了表示对国王的敬爱，10个都保持都完好无缺！");
            return p;
        }
    }
}