设计模式学习笔记--观察者模式

namespace Observer
{
    public interface Subject
    {
        void Notify();

        string SubjectState
        {
            get;
            set;
        }
    }
}

using System;

namespace Observer
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/28 8:46:39 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// Boss说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public class Boss:Subject
    {
        public event EventHandler Update;

        private string action;

        public void Notify()
        {
            Update();
        }

        public string SubjectState
        {
            get
            {
                return action;
            }
            set
            {
                action = value;
            }
        }
    }
}

using System;

namespace Observer
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/28 8:48:31 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// Secretary说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public class Secretary:Subject
    {
        public event EventHandler Update;

        private string action;

        public void Notify()
        {
            Update();
        }

        public string SubjectState
        {
            get
            {
                return action;
            }
            set
            {
                action = value;
            }
        }
    }
}

using System;

namespace Observer
{
    public delegate void EventHandler();
}

using System;

namespace Observer
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/28 8:37:06 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// StockObserver说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public class StockObserver
    {
        private string name;
        private Subject subject;

        public StockObserver(string name,Subject 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);
        }
    }
}

using System;

namespace Observer
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/28 8:42:40 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// NBAObserver说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public class NBAObserver
    {
        private string name;
        private Subject subject;

        public NBAObserver(string name,Subject 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);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Observer
{
    class Program
    {
        static void Main(string[] args)
        {
            Boss huhansan = new Boss();

            StockObserver stockObserver = new StockObserver("魏关姹",huhansan);
            NBAObserver nbaObserver = new NBAObserver("易管查",huhansan);

            huhansan.Update += new EventHandler(stockObserver.CloseStockMarket);
            huhansan.Update += new EventHandler(nbaObserver.CloseNBADirectSeeding);

            huhansan.SubjectState = "我胡汉三回来了！";
            huhansan.Notify();
        }
    }
}