static void Main(string[] args)
        {
            //缺點: A.抽象通知者還是依賴抽象觀察者
            //      B.具體觀察者不一定是Update方法要叫用
            //去掉抽象觀察者類別
            Boss          boss      = new Boss();
            BossEventArgs eventargs = new BossEventArgs()
            {
                Message = "燈愣!!"
            };
            StockObserver john  = new StockObserver("john", boss);
            NBAObserver   kevin = new NBAObserver("kevin", boss);

            boss.SubjectState        = "老闆回來惹!";
            boss.UpdateEventHandler += new EventHandler(john.CloseStockMarket);
            boss.UpdateEventHandler += new EventHandler(kevin.CloseNBADirectSeeding);

            boss.Notify(eventargs);
            Console.ReadKey();
        }
 public void Notify(BossEventArgs e)
 {
     UpdateEventHandler(this, e);
 }