用一个控制器（带有几个开关）来控制所有的电器？神奇而简单的实现：

 

 

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Command

{

    public interface Command

    {

        void execute();

        void execute1();

        void execute2();

    }

}

 

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Command

{

    /// <summary>

    /// 电灯类

    /// </summary>

    public class Light

    {

        public Light(){}

        public void on()

        {

            System.Console.WriteLine("开灯");

        }

        public void off()

        {

            System.Console.WriteLine("关灯");

        }

    }

    /// <summary>

    /// 电视类,具有不同的方法

    /// </summary>

    public class TV

    {

        public TV() { }

        public void open()

        {

            System.Console.WriteLine("开电视");

        }

        public void close()

        {

            System.Console.WriteLine("关电视");

        }

        public void changeChannel()

        {

            System.Console.WriteLine("换台");

        }

        public void setVolume(int i)

        {

            System.Console.WriteLine("控制音量"+i.ToString());

        }

    }

}

 

 

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Command

{

    public class LightCommands : Command

    {

        Light light;

        public LightCommands(Light l)

        {

            this.light = l;

        }

        #region Command 成员

        public void execute()

        {

            light.on();

        }

        void Command.execute1()

        {

            light.off();

        }

        //啥也不做!

        void Command.execute2()

        {

            //throw new NotImplementedException();

        }

        #endregion

    }

    public class TVCommands : Command

    {

        TV tv;

        public TVCommands(TV tv)

        {

            this.tv = tv;

        }

        #region Command 成员

        public void execute()

        {

            tv.open();

        }

        void Command.execute1()

        {

            tv.close();

        }

        /// <summary>

        /// 特别的操作:换台

        /// </summary>

        void Command.execute2()

        {

            tv.changeChannel();

        }

        #endregion

    }

}

 

 

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Command

{

    /// <summary>

    /// 遥控器,要把它作为万能的控制中心

    /// </summary>

    public class ControlCenter

    {

        Command com;

        public ControlCenter() { }

        public void setCommand(Command c)

        {

            this.com = c;

        }

        public void firstButtonPressed()

        {

            com.execute();

        }

        public void secondButtonPressed()

        {

            com.execute1();

        }

        /// <summary>

        /// 特殊的按钮,用于处理特别需求

        /// </summary>

        public void SpecButtonPressed()

        {

            com.execute2();

        }

    }

}

 

 

 

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Command

{

    class Program

    {

        static void Main(string[] args)

        {

            ControlCenter cc = new ControlCenter();

           

            Light l=new Light();

            Command c = new LightCommands(l);

            TV t = new TV();

            Command c1 = new TVCommands(t);

            cc.setCommand(c);

            cc.firstButtonPressed();

            cc.SpecButtonPressed();

            cc.secondButtonPressed();

            cc.setCommand(c1);

            cc.firstButtonPressed();

            cc.SpecButtonPressed();

            cc.secondButtonPressed();

            System.Console.ReadLine();

        }

    }

}