C#设计模式之Visitor访问者模式解决长隆欢乐世界问题实例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Com.Design.Gof.Visitor
{
  public interface ITourist
  {
    /// 

    /// 游玩
    /// 
    /// 长隆欢乐世界
     void Play(ChangLongHappyWorld happyWorld);
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Com.Design.Gof.Visitor
{
  [AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = false)]
  public class PlayAttribute : Attribute
  {
    private string _PlayItem;
    /// 

    /// 游玩的项目
    /// 
    public string PlayItem
    {
      get { return _PlayItem; }
      set { _PlayItem = value; }
    }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
namespace Com.Design.Gof.Visitor
{
  /// 

  /// 长隆欢乐世界
  /// 
  public class ChangLongHappyWorld
  {
    /// 

    /// 接待各个访问者
    /// 
    /// 
    public void visit(ITourist visitor) {
      //每个旅游者想玩的项目不一样。使用反射，方便调用
      MethodInfo[] method = visitor.GetType().GetMethods();
      foreach (MethodInfo m in method) {
        object[] property= m.GetCustomAttributes(false);
        string customerAttribute = null;
        if (property.Length>0) {
          customerAttribute = property[0].ToString();
        }
        if (customerAttribute == "Com.Design.Gof.Visitor.PlayAttribute")
        {
          m.Invoke(visitor, new object[] { });
        }
      }
    }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Com.Design.Gof.Visitor
{
  /// 

  /// 旅游者 1  想玩：十环过山车,龙卷风暴，梦幻旋马
  /// 
  public class TouristOne : ITourist
  {
    /// 

    /// 十环过山车
    /// 
    [PlayAttribute(PlayItem = "TenthRingRollerCoaster")]
    public void Play_TenthRingRollerCoaster() {
      Console.WriteLine("我是游客1，我现在玩的是：十环过山车");
    }
    /// 

    /// 龙卷风暴
    /// 
     [PlayAttribute(PlayItem = "TornadoStorm")]
    public void Play_TornadoStorm()
    {
      Console.WriteLine("我是游客1，我现在玩的是：龙卷风暴");
    }
    /// 

    /// 梦幻旋马
    /// 
    [PlayAttribute(PlayItem = "DreamHorse")]
    public void Play_DreamHorse()
    {
      Console.WriteLine("我是游客1，我现在玩的是：梦幻旋马");
    }
    public void Play(ChangLongHappyWorld happyWorld)
    {
      happyWorld.visit(this);
    }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Com.Design.Gof.Visitor
{
  /// 

  /// 旅游者 2  想玩：空中警察,欢乐摩天轮，超级水战
  /// 
  public class TouristTwo : ITourist
  {
    /// 

    /// 空中警察
    /// 
    [PlayAttribute(PlayItem = "AirPolice")]
    public void Play_AirPolice() {
      Console.WriteLine("我是游客2，我现在玩的是：空中警察");
    }
    /// 

    /// 欢乐摩天轮
    /// 
    [PlayAttribute(PlayItem = "FerrisWheel")]
    public void Play_FerrisWheel()
    {
      Console.WriteLine("我是游客2，我现在玩的是：欢乐摩天轮");
    }
    /// 

    /// 超级水战
    /// 
    [PlayAttribute(PlayItem = "SuperWater")]
    public void Play_SuperWater()
    {
      Console.WriteLine("我是游客2，我现在玩的是：超级水战");
    }
    public void Play(ChangLongHappyWorld happyWorld)
    {
      happyWorld.visit(this);
    }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Com.Design.Gof.Visitor
{
  /// 

  /// 旅游者 3  想玩：四维影院,垂直极限，U型滑板
  /// 
  public class TouristThree : ITourist
  {
    /// 

    /// 四维影院
    /// 
    [PlayAttribute(PlayItem = "AirPolice")]
    public void Play_Cinema4D() {
      Console.WriteLine("我是游客3，我现在玩的是：四维影院");
    }
    /// 

    /// 垂直极限
    /// 
    [PlayAttribute(PlayItem = "VerticalLimit")]
    public void Play_VerticalLimit()
    {
      Console.WriteLine("我是游客3，我现在玩的是：垂直极限");
    }
    /// 

    /// U型滑板
    /// 
    [PlayAttribute(PlayItem = "UShapeSkateboard")]
    public void Play_UShapeSkateboard()
    {
      Console.WriteLine("我是游客3，我现在玩的是：U型滑板");
    }
    public void Play(ChangLongHappyWorld happyWorld)
    {
      happyWorld.visit(this);
    }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Com.Design.Gof.Visitor;
namespace Com.Design.Gof.Test
{
  class Program
  {
    static void Main(string[] args)
    {
      //三个小伙子，开车到长隆欢乐世界 游玩， 每个人想玩的项目都不一样。
      List list = new List {
       new TouristOne(),
       new TouristTwo(),
       new TouristThree()
      };
      //车开到了长隆 南大门，长隆到了
      ChangLongHappyWorld happyWorld = new ChangLongHappyWorld();
      //开始 游玩 长隆啦！！
      foreach (var visit in list) {
        visit.Play(happyWorld);
        Console.WriteLine("------------------------------------------------");
      }
      Console.ReadKey();
    }
  }
}