解析C#设计模式编程中外观模式Facade Pattern的应用

using System;
namespace Facade 
{ 
  /// <summary> 
  /// 投影仪 
  /// </summary> 
  public class Projector 
  { 
    public void OpenProjector() 
    { 
      Console.WriteLine("打开投影仪"); 
    }
    public void CloseProjector() 
    { 
      Console.WriteLine("关闭投影仪"); 
    }
    public void SetWideScreen() 
    { 
      Console.WriteLine("投影仪状态为宽屏模式"); 
    }
    public void SetStandardScreen() 
    { 
      Console.WriteLine("投影仪状态为标准模式"); 
    } 
  } 
}
     
     
using System;
namespace Facade 
{ 
  /// <summary> 
  /// 功放机 
  /// </summary> 
  public class Amplifier 
  { 
    public void OpenAmplifier() 
    { 
      Console.WriteLine("打开功放机"); 
    }
    public void CloseAmplifier() 
    { 
      Console.WriteLine("关闭功放机"); 
    } 
  } 
}
       
        
using System;
namespace Facade 
{ 
  /// <summary> 
  /// 屏幕 
  /// </summary> 
  public class Screen 
  { 
    public void OpenScreen() 
    { 
      Console.WriteLine("打开屏幕"); 
    }
    public void CloseScreen() 
    { 
      Console.WriteLine("关闭屏幕"); 
    } 
  } 
}
        
        
using System;
namespace Facade 
{ 
  /// <summary> 
  /// DVD播放器 
  /// </summary> 
  public class DVDPlayer 
  { 
    public void OpenDVDPlayer() 
    { 
      Console.WriteLine("打开 DVD 播放器"); 
    }
    public void CloseDVDPlayer() 
    { 
      Console.WriteLine("关闭 DVD 播放器"); 
    } 
  } 
}
        
       
using System;
namespace Facade 
{ 
  /// <summary> 
  /// 灯光 
  /// </summary> 
  public class Light 
  { 
    public void OpenLight() 
    { 
      Console.WriteLine("打开灯光"); 
    }
    public void CloseLight() 
    { 
      Console.WriteLine("关闭灯光"); 
    } 
  } 
}

namespace Facade 
{ 
  /// <summary> 
  /// 定义一个外观 
  /// </summary> 
  public class MovieFacade 
  { 
    /// <summary> 
    /// 在外观类中必须保存有子系统中各个对象 
    /// </summary> 
    private Projector projector; 
    private Amplifier amplifier; 
    private Screen screen; 
    private DVDPlayer dvdPlayer; 
    private Light light;
    public MovieFacade() 
    { 
      projector = new Projector(); 
      amplifier = new Amplifier(); 
      screen = new Screen(); 
      dvdPlayer = new DVDPlayer(); 
      light = new Light(); 
    }
    /// <summary> 
    /// 打开电影 
    /// </summary> 
    public void OpenMovie() 
    { 
      //先打开投影仪 
      projector.OpenProjector(); 
      //再打开功放 
      amplifier.OpenAmplifier(); 
      //再打开屏幕 
      screen.OpenScreen(); 
      //再打开 DVD 
      dvdPlayer.OpenDVDPlayer(); 
      //再打开灯光 
      light.OpenLight(); 
    }
    /// <summary> 
    /// 关闭电影 
    /// </summary> 
    public void CloseMovie() 
    { 
      //关闭投影仪 
      projector.CloseProjector(); 
      //关闭功放 
      amplifier.CloseAmplifier(); 
      //关闭屏幕 
      screen.CloseScreen(); 
      //关闭 DVD 
      dvdPlayer.CloseDVDPlayer(); 
      //关闭灯光 
      light.CloseLight(); 
    } 
  } 
}

using System;
namespace FacadeTest 
{ 
  class Program 
  { 
    static void Main(string[] args) 
    { 
      Facade.MovieFacade movie = new Facade.MovieFacade(); 
      Facade.Projector projector = new Facade.Projector();
        
      //首先是观看电影 
      movie.OpenMovie();
      Console.WriteLine();
       
      //然后是将投影仪模式调到宽屏模式 
      projector.SetWideScreen(); 
      //再将投影仪模式调回普通模式 
      projector.SetStandardScreen(); 
      Console.WriteLine();
      
      //最后就是关闭电影了 
      movie.CloseMovie();
      Console.ReadKey(); 
    } 
  } 
}