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C#設(shè)計(jì)模式之Visitor訪問(wèn)者模式解決長(zhǎng)隆歡樂世界問(wèn)題實(shí)例

更新時(shí)間：2017年09月13日 11:20:31 作者：GhostRider

這篇文章主要介紹了C#設(shè)計(jì)模式之Visitor訪問(wèn)者模式解決長(zhǎng)隆歡樂世界問(wèn)題,簡(jiǎn)單描述了訪問(wèn)者模式的定義并結(jié)合具體實(shí)例形式分析了C#使用訪問(wèn)者模式解決長(zhǎng)隆歡樂世界問(wèn)題的具體實(shí)現(xiàn)技巧,需要的朋友可以參考下

本文實(shí)例講述了C#設(shè)計(jì)模式之Visitor訪問(wèn)者模式解決長(zhǎng)隆歡樂世界問(wèn)題。分享給大家供大家參考，具體如下：

一、理論定義

訪問(wèn)者模式提供了一組集合對(duì)象統(tǒng)一的訪問(wèn)接口，適合對(duì) 一個(gè)集合中的對(duì)象，進(jìn)行邏輯操作，使數(shù)據(jù)結(jié)構(gòu) 和邏輯結(jié)構(gòu)分離。

二、應(yīng)用舉例

需求描述：暑假來(lái)啦！三個(gè)小伙子組團(tuán)，開車來(lái) 長(zhǎng)隆歡樂世界玩。
每個(gè)人想玩的項(xiàng)目都不一樣，
旅游者 1   想玩：十環(huán)過(guò)山車,龍卷風(fēng)暴，夢(mèng)幻旋馬
旅游者 2   想玩：空中警察,歡樂摩天輪，超級(jí)水戰(zhàn)
旅游者 3   想玩：四維影院,垂直極限，U型滑板
車開到長(zhǎng)隆后，就開始各自Enjoy啦?。?！

三、具體編碼

1.一個(gè)旅游者接口，里面有一個(gè)Play游玩方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Com.Design.Gof.Visitor
{
  public interface ITourist
  {
    /// <summary>
    /// 游玩
    /// </summary>
    /// <param name="happyWorld">長(zhǎng)隆歡樂世界</param>
     void Play(ChangLongHappyWorld happyWorld);
  }
}

2.每個(gè)人要玩什么項(xiàng)目，都有一個(gè)標(biāo)志

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;
    /// <summary>
    /// 游玩的項(xiàng)目
    /// </summary>
    public string PlayItem
    {
      get { return _PlayItem; }
      set { _PlayItem = value; }
    }
  }
}

3.長(zhǎng)隆歡樂世界

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
namespace Com.Design.Gof.Visitor
{
  /// <summary>
  /// 長(zhǎng)隆歡樂世界
  /// </summary>
  public class ChangLongHappyWorld
  {
    /// <summary>
    /// 接待各個(gè)訪問(wèn)者
    /// </summary>
    /// <param name="visitor"></param>
    public void visit(ITourist visitor) {
      //每個(gè)旅游者想玩的項(xiàng)目不一樣。使用反射，方便調(diào)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[] { });
        }
      }
    }
  }
}

4.旅游者 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Com.Design.Gof.Visitor
{
  /// <summary>
  /// 旅游者 1  想玩：十環(huán)過(guò)山車,龍卷風(fēng)暴，夢(mèng)幻旋馬
  /// </summary>
  public class TouristOne : ITourist
  {
    /// <summary>
    /// 十環(huán)過(guò)山車
    /// </summary>
    [PlayAttribute(PlayItem = "TenthRingRollerCoaster")]
    public void Play_TenthRingRollerCoaster() {
      Console.WriteLine("我是游客1，我現(xiàn)在玩的是：十環(huán)過(guò)山車");
    }
    /// <summary>
    /// 龍卷風(fēng)暴
    /// </summary>
     [PlayAttribute(PlayItem = "TornadoStorm")]
    public void Play_TornadoStorm()
    {
      Console.WriteLine("我是游客1，我現(xiàn)在玩的是：龍卷風(fēng)暴");
    }
    /// <summary>
    /// 夢(mèng)幻旋馬
    /// </summary>
    [PlayAttribute(PlayItem = "DreamHorse")]
    public void Play_DreamHorse()
    {
      Console.WriteLine("我是游客1，我現(xiàn)在玩的是：夢(mèng)幻旋馬");
    }
    public void Play(ChangLongHappyWorld happyWorld)
    {
      happyWorld.visit(this);
    }
  }
}

5.旅游者 2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Com.Design.Gof.Visitor
{
  /// <summary>
  /// 旅游者 2  想玩：空中警察,歡樂摩天輪，超級(jí)水戰(zhàn)
  /// </summary>
  public class TouristTwo : ITourist
  {
    /// <summary>
    /// 空中警察
    /// </summary>
    [PlayAttribute(PlayItem = "AirPolice")]
    public void Play_AirPolice() {
      Console.WriteLine("我是游客2，我現(xiàn)在玩的是：空中警察");
    }
    /// <summary>
    /// 歡樂摩天輪
    /// </summary>
    [PlayAttribute(PlayItem = "FerrisWheel")]
    public void Play_FerrisWheel()
    {
      Console.WriteLine("我是游客2，我現(xiàn)在玩的是：歡樂摩天輪");
    }
    /// <summary>
    /// 超級(jí)水戰(zhàn)
    /// </summary>
    [PlayAttribute(PlayItem = "SuperWater")]
    public void Play_SuperWater()
    {
      Console.WriteLine("我是游客2，我現(xiàn)在玩的是：超級(jí)水戰(zhàn)");
    }
    public void Play(ChangLongHappyWorld happyWorld)
    {
      happyWorld.visit(this);
    }
  }
}

6.旅游者 3

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Com.Design.Gof.Visitor
{
  /// <summary>
  /// 旅游者 3  想玩：四維影院,垂直極限，U型滑板
  /// </summary>
  public class TouristThree : ITourist
  {
    /// <summary>
    /// 四維影院
    /// </summary>
    [PlayAttribute(PlayItem = "AirPolice")]
    public void Play_Cinema4D() {
      Console.WriteLine("我是游客3，我現(xiàn)在玩的是：四維影院");
    }
    /// <summary>
    /// 垂直極限
    /// </summary>
    [PlayAttribute(PlayItem = "VerticalLimit")]
    public void Play_VerticalLimit()
    {
      Console.WriteLine("我是游客3，我現(xiàn)在玩的是：垂直極限");
    }
    /// <summary>
    /// U型滑板
    /// </summary>
    [PlayAttribute(PlayItem = "UShapeSkateboard")]
    public void Play_UShapeSkateboard()
    {
      Console.WriteLine("我是游客3，我現(xiàn)在玩的是：U型滑板");
    }
    public void Play(ChangLongHappyWorld happyWorld)
    {
      happyWorld.visit(this);
    }
  }
}

7.主函數(shù)

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)
    {
      //三個(gè)小伙子，開車到長(zhǎng)隆歡樂世界 游玩， 每個(gè)人想玩的項(xiàng)目都不一樣。
      List<ITourist> list = new List<ITourist> {
       new TouristOne(),
       new TouristTwo(),
       new TouristThree()
      };
      //車開到了長(zhǎng)隆 南大門，長(zhǎng)隆到了
      ChangLongHappyWorld happyWorld = new ChangLongHappyWorld();
      //開始 游玩 長(zhǎng)隆啦??！
      foreach (var visit in list) {
        visit.Play(happyWorld);
        Console.WriteLine("------------------------------------------------");
      }
      Console.ReadKey();
    }
  }
}

8.運(yùn)行結(jié)果