门面（Facade）模式

    /// <summary>
    /// 门面（Facade）模式
    /// 外部与一个子系统的通信必须通过一个统一的门面(Facade)对象进行，这就是门面模式。
    /// </summary>
    class Program
    {

        private static SecurityFacade security;
        public static void Main(string[] args)
        {
            security = new SecurityFacade();
            security.Activate();
            Console.WriteLine("\n--------------------\n");
            security.Deactivate();

            Console.ReadLine();
        }
    }

    /// <summary>
    /// 子系统(subsystem)角色 相机
    /// </summary>
    public class Camera
    {
        public void TurnOn()
        {
            Console.WriteLine("打开 camera.");
        }
        public void TurnOff()
        {
            Console.WriteLine("关闭 camera.");
        }
        public void Rotate(int degrees)
        {
            Console.WriteLine("Rotating the camera by {0} degrees.", degrees);
        }
    }

    /// <summary>
    /// 子系统(subsystem)角色  电灯
    /// </summary>
    public class Light
    {
        public void TurnOff()
        {
            Console.WriteLine("打开电灯.");
        }
        public void TurnOn()
        {
            Console.WriteLine("关闭电灯.");
        }
        public void ChangeBulb()
        {
            Console.WriteLine("changing the light-bulb.");
        }
    }

    /// <summary>
    /// 子系统(subsystem)角色  感应器
    /// </summary>
    public class Sensor
    {
        public void Activate()
        {
            Console.WriteLine("激活传感器.");
        }
        public void Deactivate()
        {
            Console.WriteLine("注销传感器.");
        }

        public void Trigger()
        {
            Console.WriteLine("The sensor has triggered.");
        }
    }

    /// <summary>
    /// 子系统(subsystem)角色  警报器
    /// </summary>
    public class Alarm
    {

        public void Activate()
        {
            Console.WriteLine("Activating the alarm.");
        }
        public void Deactivate()
        {
            Console.WriteLine("Deactivating the alarm.");
        }
        public void Ring()
        {
            Console.WriteLine("Ringing the alarm.");
        }
        public void StopRing()
        {
            Console.WriteLine("Stop the alarm.");
        }
    }

    /// <summary>
    /// 门面(Facade)角色
    /// </summary>
    public class SecurityFacade
    {
        private static Camera camera1, camera2;
        private static Light light1, light2, light3;
        private static Sensor sensor;
        private static Alarm alarm;

        static SecurityFacade()
        {
            camera1 = new Camera();
            camera2 = new Camera();
            light1 = new Light();
            light2 = new Light();
            light3 = new Light();
            sensor = new Sensor();
            alarm = new Alarm();
        }

        public void Activate()
        {
            camera1.TurnOn();
            camera2.TurnOn();
            light1.TurnOn();
            light2.TurnOn();
            light3.TurnOn();
            sensor.Activate();
            alarm.Activate();
        }

        public void Deactivate()
        {
            camera1.TurnOff();
            camera2.TurnOff();
            light1.TurnOff();
            light2.TurnOff();
            light3.TurnOff();
            sensor.Deactivate();
            alarm.Deactivate();
        }