Exemplo n.º 1
0
        static void Main(string[] args)
        {
            #region 基本用法(Basic.cs)
            ConcreteSubject s = new ConcreteSubject();

            s.Attach(new ConcreteObserver(s, "X"));
            s.Attach(new ConcreteObserver(s, "Y"));
            s.Attach(new ConcreteObserver(s, "Z"));

            s.SubjectState = "ABC";
            s.Notify();
            #endregion

            #region 具体实例(Example.cs)
            //相比于基本用法,这个实例:
            //①进一步将通知者和观察者分离,运用依赖倒转原则,在客户端中将观察者动作委托给通知者,进一步降低了耦合
            //②观察者实例无需继承观察者接口

            Boss huhanshan = new Boss();

            StockObserver tongshi1 = new StockObserver("魏关姹", huhanshan);
            NBAOberver tongshi2 = new NBAOberver("易管查", huhanshan);

            huhanshan.Update += new EventHandler(tongshi1.CloseStockMarket);
            huhanshan.Update += new EventHandler(tongshi2.CloseNBADirectSeeding);

            huhanshan.SubjectState = "我胡汉三回来了";
            huhanshan.Notify();

            Console.Read();
            #endregion
        }