初学事件Event（二）

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事件的完整声明：（刘铁猛老师视频示例）
按照事件的5要素去写
using System;using System.Threading;namespace EventFullDeclaration{    class Program    {        static void Main(string[] args)        {            Customer customer = new Customer();            Waiter waiter = new Waiter();            customer.Order += waiter.Action;            customer.Action();        }    }    //declare a delegate type    public delegate void OrderEventHandler(Customer customer,OrderEventArgs e);    public class OrderEventArgs :EventArgs     {        public string DishName { get; set; }        public string  Size { get; set; }    }    //Customer类 事件的拥有者 以及 事件成员    //触发事件由事件拥有者的内部逻辑触发    public  class Customer    {        //声明一个委托类型的字段        private  OrderEventHandler orderEventHandler;        //用委托OrderEventHandler类型 来约束事件        public event OrderEventHandler Order        {            //事件处理器的添加器            add            {                this.orderEventHandler += value;            }            remove            {                this.orderEventHandler -= value;            }        }        public double Bill { get; set; }        public void PayTheBill()        {            Console.WriteLine("I will pay you ${0}",this.Bill);        }        public void WalkIn()        {            Console.WriteLine("I walk into the restaurant");        }        public void SitDown()        {            Console.WriteLine("Sit Down");        }        public void Think()        {            for (int i = 0; i < 5; i++)            {                Console.WriteLine("Let me think");                Thread.Sleep(1000);            }            if(orderEventHandler != null)            {                OrderEventArgs e = new OrderEventArgs ();                e.DishName  = "Pork";                e.Size = "large";                this.orderEventHandler (this , e);                this.orderEventHandler.Invoke(this, e);            }        }        public void Action()        {            this.WalkIn();            this.SitDown();            this.Think();        }    }    public class Waiter    {        //事件处理器        public void Action(Customer customer, OrderEventArgs e)        {            Console.WriteLine("I will sever you the dish : {0}",e.DishName );            double price = 10;            switch (e.Size )            {                case "large":                    price *= 1.5;                    break;                case "small":                    price *= 0.5;                    break;                default:                    break;            }            customer.Bill += price;        }    }}
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