委托：两个例子(主人仆人、打游戏)

using System;

namespace gainian.DelegateExample
{
    
    public delegate void EatEventHander(object sender, EatEventArgs e);
    
    public class EatEventArgs: EventArgs
    {
        public string EatWhere;
        public decimal EatMoney;
        
        public EatEventArgs(string EatWhere, decimal EatMoney)
        {
            this.EatWhere = EatWhere;
            this.EatMoney = EatMoney;
        }
    }
    
    public class Delegate1
    {
//        static void Main(string[] args)
//        {
//            Master master = new Master();
//            Servant servant = new Servant();
//            
//            master.EatEvent += new EatEventHander(servant.Arrange);
//            master.OnHungry("福州大酒店", 1000);
//            
//            Console.ReadLine();    
//        }
    }

    class Master
    {                
        public event EatEventHander EatEvent;        
        
        private void OnEatEvent(EatEventArgs e)
        {
            if(EatEvent!=null)
            {
                EatEvent(this, e);
            }
        }
        
        public void OnHungry(string EatWhere, decimal EatMoney)
        {
            EatEventArgs e = new EatEventArgs(EatWhere, EatMoney);
            
            Console.WriteLine("主人：我肚子有点饿了！");
            Console.WriteLine("主人：我准备去 {0}吃饭，",EatWhere);
            Console.WriteLine("主人：准备消费 {0} ！",EatMoney);
            Console.WriteLine("主人：仆人，快替我准备预定！\n");
            
            OnEatEvent(e);
        }
        
    }
    
    class Servant
    {
        public void Arrange(object sender, EatEventArgs e)
        {
            Console.WriteLine("仆人：我已接到您的指示了！");
            Console.WriteLine("仆人：您准备去 {0}吃饭，",e.EatWhere);
            Console.WriteLine("仆人：您消费 {0} ！",e.EatMoney);
            Console.WriteLine("仆人：我马上帮您预定！\n");            
        }
    }    

}

using System;

namespace gainian.DelegateExample
{
        
    public delegate void PlaygameEventHandle(Employee emp);
    
    /**//// <summary>
    /// Delegate2 的摘要说明。
    /// </summary>
    public class Delegate2
    {
        public Delegate2()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
        
        static void Main(string[] args)
        {
            XiaoLi xiaoli = new XiaoLi("小李",1000);
            XiaoZhang xiaozhang = new XiaoZhang("小张",1000);
            
            Console.WriteLine("小李原来的薪水是 {0}", xiaoli.Salary);
            
            xiaoli.playgameEvent += new PlaygameEventHandle(xiaozhang.SubtractSalary);
            xiaoli.OnPlaygame();
            
            Console.WriteLine("小李打游戏后的薪水是 {0}", xiaoli.Salary);
            
            Console.ReadLine();
        }
        
    }
    
    public class Employee
    {
        private string name;
        
        private decimal salary;
        
        public Employee(string name, decimal salary)
        {
            this.name = name;
            this.salary = salary;
        }
        
        public string Name
        {
            get
            {
                return this.name;
            }
            set
            {
                this.name = value;
            }
        }
        
        public decimal Salary
        {
            get
            {
                return this.salary;
            }
            set
            {
                this.salary = value;
            }
        }
        
        public virtual void OnPlaygame()
        {
            this.salary -= 10;
        }
                
    }
    
    public class XiaoLi: Employee
    {
        public XiaoLi(string name, decimal salary) : base(name,salary)
        {}
        
        public event PlaygameEventHandle playgameEvent;
        
        public override void OnPlaygame()
        {
            Console.WriteLine("\n小李正在打游戏。。。\n");
            if(playgameEvent!=null)
            {
                playgameEvent(this);
            }
        }
        
    }    
    
    public class XiaoZhang: Employee
    {
        public XiaoZhang(string name, decimal salary) : base(name,salary)
        {}
        
        public void SubtractSalary(Employee emp)
        {
            Console.WriteLine(this.Name + " 发现 " + emp.Name + " 在打游戏。");
            emp.Salary -= 100;
            Console.WriteLine(this.Name + " 扣了 " + emp.Name + " 100块钱！\n");
        }
    }
    
    
}