当饮水机没水了，饮水机会通知人去换水（这是智能饮水机）

using System;

using System.Collections.Generic;

using System.Text;

 

namespace warteringTrough

{

    class Program

    {

        static void Main(string[] args)

        {

            int w1 = 3;

            int w2 = 2;

            warteringTrough wt1 = new warteringTrough("number1", w1);//饮水机

            warteringTrough wt2 = new warteringTrough("number2", w2);//饮水机

            people me = new people("syler");//一个人

            wt1.waterOutHandler += me.fillWater;

            wt2.waterOutHandler += me.fillWater;

            for (int i = 0; i < w1; i++)

                wt1.flowOut();//1号饮水机的水逐渐减少

            for (int i = 0; i < w2; i++)

                wt2.flowOut();//2号饮水机的水也逐渐减少

        }

    }

    public class warteringTrough

    {

        public warteringTrough(string identity, int water)

        {

            this._identity = identity;

            this._waterNum = water;

        }

        private int _waterNum = 0;

 

        private string _identity = string.Empty;

        public string Size

        {

            get { return _identity; }

        }

 

        public delegate void waterOut(object sender, flowingEventArgs e);

        public event waterOut waterOutHandler;

 

        public int WaterNum

        {

            get { return _waterNum; }

            set { _waterNum = value; }

        }

        public void flowOut()

        {

            _waterNum--;

            Console.WriteLine("{1}:someone is getting the water, there is {0} left...", _waterNum, _identity);

 

            whenWaterIsflowing();

 

        }

        public void whenWaterIsflowing()

        {

            if (waterOutHandler != null)

            {

                waterOutHandler(this, new flowingEventArgs(_waterNum));

            }

        }

    }

    /*

     * 假设有两台饮水机，当没水时会通知人去装水。

     */

    public class flowingEventArgs : EventArgs

    {

        private readonly int _waterNum = 0;

 

        public int WaterNum

        {

            get { return _waterNum; }

        }

 

        public flowingEventArgs(int water)

        {

            _waterNum = water;

        }

    }

 

    public class people

    {

        private string _name = string.Empty;

        public people(string name)

        {

            _name = name;

        }

        public void fillWater(object sender, flowingEventArgs e)

        {

            Console.WriteLine("{0}:there is {1} water in the water trough.", _name, e.WaterNum);//可以从这里得到感兴趣的参数，比如水还剩多少

            if (e.WaterNum == 0)

            {

                warteringTrough wt = (warteringTrough)sender;//也可以在这里得到饮水机

                Console.WriteLine("{0}:I'm here to deal {1}, so tired a day.", _name, wt.Size);//假设这是饮水机的容量什么的(wt.Size)

            }

 

        }

        public string Name

        {

            get { return _name; }

            set { _name = value; }

        }

    }

}