命令模式

这个模式主要用到类的封装调用，示例：

    public interface ICommand
    {
         void Execute();
    }

    public class Light
    {
        private bool _ison;
        public Light()
        {
            _ison = false;
            Off();
        }

        public bool On()
        {
            _ison =true;
            Console.WriteLine("Light is on,see it");
            return true;
        }

        public bool Off()
        {
            if (!_ison)
            {
                Console.WriteLine("At frist.The light is off");
            }
            else
            {
                Console.WriteLine("At Last.The light is off");
            }
            return false;
        }
    }

    public class LightOnCommand : ICommand
    {
        public Light Light { get; set; }

        public LightOnCommand(Light light)
        {
            Light = light;
        }
        public void Execute()
        {
            Light.On();
        }
    }

    public class GarageDoorOpen:ICommand
    {
        public Light Light { get; set; }

        public GarageDoorOpen(Light light)
        {
            Light = light;
        }
        public void Execute()
        {
            Light.Off();
        }

        public void Up()
        {
            Light.Off();
        }

        public void Down()
        {
            Light.On();
        }

        public void Stop()
        {
            Light.Off();
        }
    }
    public class SimpleRemoteControl
    {
        public ICommand Slot;
        //public SimpleRemoteControl() { }

        public void SetCommand(ICommand command)
        {
            Slot = command;
        }

        public void ButtonWasPressed()
        {
            Slot.Execute();
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var simpleRemoteControl=new SimpleRemoteControl();
            var light=new Light();
            var lightOn=new LightOnCommand(light);
            simpleRemoteControl.SetCommand(lightOn);
            simpleRemoteControl.ButtonWasPressed();
            light.Off();
            var garageDoorOpen = new GarageDoorOpen(light);
            simpleRemoteControl.SetCommand(garageDoorOpen);
            garageDoorOpen.Down();
            simpleRemoteControl.ButtonWasPressed();
            Console.ReadLine();

结果：At frist.The light is off

        Light is on,see it

        At Last.The light is off

        Light is on,see it

        At Last.The light is off