设计模式学习之观察者模式（Observer,行为型模式）（7）

private static void Main(string[] args)
        {
            Boss boss = new Boss();
            boss.Update += new StockObserver("股票哥", boss).CloseStockMarket;
            boss.Update += new NBAObserver("NBA哥", boss).CloseNBADirectSeeding;
            boss.SubjectState = "老板回来了。。。";
            boss.Notify();
        }


        /// <summary>
        /// 通知者接口
        /// </summary>
        public interface ISubject
        {
            void Notify();

            string SubjectState { get; set; }
        }

        public delegate void EventHandler();

        public class Boss : ISubject
        {
            public event EventHandler Update;

            public void Notify()
            {
                if (Update != null)
                {
                    Update();
                }
            }

            public string SubjectState { get; set; }
        }

        /// <summary>
        /// 前台秘书类
        /// </summary>
        public class Secretary : ISubject
        {
            public event EventHandler Update;

            public void Notify()
            {
                if (Update != null)
                {
                    Update();
                }
            }

            public string SubjectState { get; set; }
        }

        /// <summary>
        /// 看股票的同事
        /// </summary>
        public class StockObserver
        {
            private string name;
            private ISubject subject;

            public StockObserver(string name, ISubject subject)
            {
                this.name = name;
                this.subject = subject;
            }

            public void CloseStockMarket()
            {
                Console.WriteLine("{0} {1}  关闭股票行情，继续工作！", subject.SubjectState, name);
            }
        }

        /// <summary>
        /// 看NBA的同事
        /// </summary>
        public class NBAObserver
        {
            private string name;
            private ISubject subject;

            public NBAObserver(string name, ISubject subject)
            {
                this.name = name;
                this.subject = subject;
            }

            public void CloseNBADirectSeeding()
            {
                Console.WriteLine("{0} {1}  关闭NBA直播，继续工作！", subject.SubjectState, name);
            }
        }