static void Main(string[] args)
{
Console.ReadLine();
Customer customer = new Customer(); // 事件拥有者
Watier watier = new Watier(); // 事件响应者
customer.Order += watier.Action; // 事件本身以及事件的订阅关系以及事件处理器
//customer.Action();// customer内部触发事件
OrderEventArgs e = new OrderEventArgs();
e.DishName = "Manhanquanxi";
e.Size = "large";
OrderEventArgs e2 = new OrderEventArgs();
e2.DishName = "Beer";
e2.Size = "large";
// badGuy借刀杀人 只要将Order声明为事件（即添加event关键字）即可避免
//Customer badGuy = new Customer();
//badGuy.Order += watier.Action;
//badGuy.Order.Invoke(customer,e);
//badGuy.Order.Invoke(customer,e2);
customer.PayTheBill();
}
static void Main(string[] args)
{
Customer customer = new Customer();
Watier watier = new Watier();
customer.Order += watier.Action;
customer.Action();// customer内部触发事件
customer.PayTheBill();
}