使用Interface和Dictionary

interface实现polymopherson

View Code 
 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using TryCollection.Abstract;
 6 
 7 namespace TryCollection
 8 {
 9     class Engine
10     {
11         private IState _state;
12         public IState State
13         {
14             get { return _state; }
15             set { _state = value; }
16         }
17         public void Run(IState initialState)
18         {
19             _state = initialState;
20             while (true)
21             {
22                 _state.Render();
23                 var command = _state.GetCommand();
24                 command.Execute();
25             }
26         }
27     }
28 }

dictionary实现key与value的配对

View Code 
 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using TryCollection.Abstract;
 6 using System.Collections;
 7 using TryCollection.States;
 8 using TryCollection.Commands;
 9 using TryCollection;
10 
11 namespace TryCollection.States
12 {
13     class MainMenuState : IState
14     {
15         private Engine _engine;   
16         private Dictionary<string, IState> _menuDictionary;
17         private ICommand _continueCommand;
18         private ICommand _helpCommand;
19         private IState _continueMenu;
20         private IState _helpMenu;
21         public MainMenuState(Engine engine)
22         {
23             _engine = engine;
24             _continueMenu = new ContinueMenu(_engine, this);
25             _helpMenu = this;
26 
27             _menuDictionary = new Dictionary<string, IState> //制作dictionary，使输入与对应的menu匹配
28             {
29                 { "con", _continueMenu },
30                 { "help", _helpMenu } 
31             };
32         }
33 
34         public void Render()
35         {
36             
37             Console.WriteLine("[con] - Continue");
38             Console.WriteLine("[Help] - Help\n");
39         }
40 
41         public ICommand GetCommand()
42         {
43             var inputString = Console.ReadLine();
44             //
45             foreach (var commandMenuPair in _menuDictionary)    
46             {
47                 if (commandMenuPair.Key == inputString) //这是Dictionary用的最巧妙的地方，不需要很多if else判断
48                 {
49                     _engine.State = commandMenuPair.Value;  
50                     ICommand command = ConvertCommand(inputString);
51                     return command;
52                 }
53             }
54                  return new InvalidCommand();
55         }
56         ICommand ConvertCommand(string commandString)
57         {
58             if (commandString == "con")
59             {
60                 return new ContinueCommand();
61             }
62             else
63             {
64                 return new HelpCommand();
65             }
66         }
67 
68 
69     }
70 }

Dictionary与IDictionary的区别。IDictionary例子：public IDictionary IMan<IShawn,IChris>, IShawn:IMan   IChris:IMan,他们有同样的Iman方法

posted @ 2013-05-08 10:08  若愚Shawn  阅读(201)  评论(0)  编辑  收藏  举报