C#狂想曲（1）：去类型化与弱化语法 - TonyHuang

C#狂想曲（1）：去类型化与弱化语法

本文是我博客的镜像，原文地址是：

http://www.greatony.com/?p=73

系列文章引言

众所周知，我是个彻彻底底的C#控，但是没有东西是完美的，C#也是一样，所以在这里我就yy一下，设想一下我心中C#将来的样子，故取名为《C#狂想曲》系列。

测试程序

为了体现对C#的变化，我设定了一份游戏编程中经常遇到的程序作为标准来体现变化。

1 using System;
2 using System.Collections.Generic;
3
4 namespace Orandea.Webgame
5 {
6     public class Player
7     {
8         public int Id { get; set; }
9         public int UserId { get; set; }
10         public string Name { get; set; }
11     }
12
13     public interface IPlayerService
14     {
15         int CreatePlayer(int userId, string name);
16         Player GetPlayer(int playerId);
17         Player GetPlayer(string name);
18         Player GetUserPlayer(int userId);
19     }
20
21     public class PlayerService : IPlayerService
22     {
23         public int CreatePlayer(int userId, string name)
24         {
25             var player = new Player
26             {
27                 Id = _playerIndex++,
28                 UserId = userId,
29                 Name = name;
30             };
31
32             _players.Add(player);
33
34             return player.Id;
35         }
36
37         public Player GetPlayer(int playerId)
38         {
39             return _players.FirstOrDefault(p => p.Id == playerId);
40         }
41
42         public Player GetPlayer(string playerName)
43         {
44             return _players.FirstOrDefault(p => p.Name == playerName);
45         }
46
47         public Player GetUserPlayer(int userId)
48         {
49             return _players.FirstOrDefault(p => p.UserId == userId);
50         }
51
52         private int _playerIndex = 0;
53         private List<Player> _players = new List<Player>();
54     }
55 }

很简单的程序，然后显然这是一个线程不安全的程序，线程安全的版本，我们回头再说。

去类型化

C#是一个强类型语言，相对来说也是一个静态语言。然而现在的程序越来越灵活，C#的静态性已经开始逐步制约了创造力的发挥。在处理Web场景和游戏场景中已经变的越来越力不从心，所以，在这里提出一个去类型化的想法：

类似JavaScript，申明变量、声明函数时，不需要声明类型。则上述程序变成

1 using System;
2 using System.Collections.Generic;
3
4 namespace Orandea.Webgame
5 {
6     public class Player
7     {
8         public var Id { get; set; }
9         public var UserId { get; set; }
10         public var Name { get; set; }
11     }
12
13     public interface IPlayerService
14     {
15         function CreatePlayer(userId, name);
16         function GetPlayer(playerId);
17         function GetPlayer(name);
18         function GetUserPlayer(userId);
19     }
20
21     public class PlayerService : IPlayerService
22     {
23         public function CreatePlayer(userId, name)
24         {
25             var player = new Player
26             {
27                 Id = _playerIndex++,
28                 UserId = userId,
29                 Name = name;
30             };
31
32             _players.Add(player);
33
34             return player.Id;
35         }
36
37         public function GetPlayer(playerId)
38         {
39             return _players.FirstOrDefault(p => p.Id == playerId);
40         }
41
42         public function GetPlayer(playerName)
43         {
44             return _players.FirstOrDefault(p => p.Name == playerName);
45         }
46
47         public function GetUserPlayer(userId)
48         {
49             return _players.FirstOrDefault(p => p.UserId == userId);
50         }
51
52         private var _playerIndex = 0;
53         private var _players = new List<Player>();
54     }
55 }

然而这会带来一个问题，就是两个GetPlayer的签名重复了，所以我们暂时取消C#的重载功能，变成这样：

1 using System;
2 using System.Collections.Generic;
3
4 namespace Orandea.Webgame
5 {
6     public class Player
7     {
8         public var Id { get; set; }
9         public var UserId { get; set; }
10         public var Name { get; set; }
11     }
12
13     public interface IPlayerService
14     {
15         function CreatePlayer(userId, name);
16         function GetPlayer(playerId);
17         function GetPlayerByName(name);
18         function GetUserPlayer(userId);
19     }
20
21     public class PlayerService : IPlayerService
22     {
23         public function CreatePlayer(userId, name)
24         {
25             var player = new Player
26             {
27                 Id = _playerIndex++,
28                 UserId = userId,
29                 Name = name;
30             };
31
32             _players.Add(player);
33
34             return player.Id;
35         }
36
37         public function GetPlayer(playerId)
38         {
39             return _players.FirstOrDefault(p => p.Id == playerId);
40         }
41
42         public function GetPlayerByName(playerName)
43         {
44             return _players.FirstOrDefault(p => p.Name == playerName);
45         }
46
47         public function GetUserPlayer(userId)
48         {
49             return _players.FirstOrDefault(p => p.UserId == userId);
50         }
51
52         private var _playerIndex = 0;
53         private var _players = new List<Player>();
54     }
55 }

既然类型都不重要了，那么泛型也没有存在的必要了，去除泛型，变成这样：

1 using System;
2 using System.Collections;
3
4 namespace Orandea.Webgame
5 {
6     public class Player
7     {
8         public var Id { get; set; }
9         public var UserId { get; set; }
10         public var Name { get; set; }
11     }
12
13     public interface IPlayerService
14     {
15         function CreatePlayer(userId, name);
16         function GetPlayer(playerId);
17         function GetPlayerByName(name);
18         function GetUserPlayer(userId);
19     }
20
21     public class PlayerService : IPlayerService
22     {
23         public function CreatePlayer(userId, name)
24         {
25             var player = new Player
26             {
27                 Id = _playerIndex++,
28                 UserId = userId,
29                 Name = name;
30             };
31
32             _players.Add(player);
33
34             return player.Id;
35         }
36
37         public function GetPlayer(playerId)
38         {
39             return _players.FirstOrDefault(p => p.Id == playerId);
40         }
41
42         public function GetPlayerByName(playerName)
43         {
44             return _players.FirstOrDefault(p => p.Name == playerName);
45         }
46
47         public function GetUserPlayer(userId)
48         {
49             return _players.FirstOrDefault(p => p.UserId == userId);
50         }
51
52         private var _playerIndex = 0;
53         private var _players = new List();
54     }
55 }

如果类型不重要了，那么什么重要呢？当然是通讯的接口重要。

所以我们没有必要继续显式的声明接口以及entity类了，把程序编程这样：

1 using System;
2 using System.Collections;
3
4 namespace Orandea.Webgame
5 {
6     public class PlayerService
7     {
8         public function CreatePlayer(userId, name)
9         {
10             var player = {
11                 Id = _playerIndex++,
12                 UserId = userId,
13                 Name = name
14             };
15
16             _players.Add(player);
17
18             return player.Id;
19         }
20
21         public function GetPlayer(playerId)
22         {
23             return _players.FirstOrDefault(p => p.Id == playerId);
24         }
25
26         public function GetPlayerByName(playerName)
27         {
28             return _players.FirstOrDefault(p => p.Name == playerName);
29         }
30
31         public function GetUserPlayer(userId)
32         {
33             return _players.FirstOrDefault(p => p.UserId == userId);
34         }
35
36         private var _playerIndex = 0;
37         private var _players = new List();
38     }
39 }

既然取消了明确的entity声明，那么就把创建entity对象的形式变成和javascript兼容的形式把：

1 using System;
2 using System.Collections;
3
4 namespace Orandea.Webgame
5 {
6     public class PlayerService
7     {
8         public function CreatePlayer(userId, name)
9         {
10             var player = {
11                 Id: _playerIndex++,
12                 UserId: userId,
13                 Name: name
14             };
15
16             _players.Add(player);
17
18             return player.Id;
19         }
20
21         public function GetPlayer(playerId)
22         {
23             return _players.FirstOrDefault(p => p.Id == playerId);
24         }
25
26         public function GetPlayerByName(playerName)
27         {
28             return _players.FirstOrDefault(p => p.Name == playerName);
29         }
30
31         public function GetUserPlayer(userId)
32         {
33             return _players.FirstOrDefault(p => p.UserId == userId);
34         }
35
36         private var _playerIndex = 0;
37         private var _players = new List();
38     }
39 }

至此，C#已经不具有编译时强类型了。继续我们的改造～～～

弱化语法

C#从C/C++中继承了很多格式化的，教条的语法，就算我们改成了javascript的形式，我们仍然需要使用var和function来显式的区分函数和变量。

在javascript中，这个限制来源于function作为第一类对象，可以在任何地方声明，如果不限制的话，会导致程序混淆。

然而在c#里面，函数作为类的成员存在，所以没有这个问题，自然的，也不需要使用function和var关键字来区分类的方法和类的数据成员，那么可以变成这样：

1 using System;
2 using System.Collections;
3
4 namespace Orandea.Webgame
5 {
6     public class PlayerService
7     {
8         public CreatePlayer(userId, name)
9         {
10             var player = {
11                 Id: _playerIndex++,
12                 UserId: userId,
13                 Name: name
14             };
15
16             _players.Add(player);
17
18             return player.Id;
19         }
20
21         public GetPlayer(playerId)
22         {
23             return _players.FirstOrDefault(p => p.Id == playerId);
24         }
25
26         public GetPlayerByName(playerName)
27         {
28             return _players.FirstOrDefault(p => p.Name == playerName);
29         }
30
31         public GetUserPlayer(userId)
32         {
33             return _players.FirstOrDefault(p => p.UserId == userId);
34         }
35
36         private _playerIndex = 0;
37         private _players = new List();
38     }
39 }

在使用new关键字调用无参的构造函数的时候，那一对（）是多余的，所以我们可以去掉他们：

我想，在一个文件里面，层层相套的花括号已经太让人心烦了，所以，我们可以去掉不必要的花括号，包括namespace、class和function的，如果他们都只包含一个他们的子元素，那么可以不写花括号：

1 using System;
2 using System.Collections;
3
4 namespace Orandea.Webgame
5     public class PlayerService
6     {
7         public CreatePlayer(userId, name)
8         {
9             var player = {
10                 Id: _playerIndex++,
11                 UserId: userId,
12                 Name: name
13             };
14
15             _players.Add(player);
16
17             return player.Id;
18         }
19
20         public GetPlayer(playerId)
21             return _players.FirstOrDefault(p => p.Id == playerId);
22
23         public GetPlayerByName(playerName)
24             return _players.FirstOrDefault(p => p.Name == playerName);
25
26         public GetUserPlayer(userId)
27             return _players.FirstOrDefault(p => p.UserId == userId);
28
29         private _playerIndex = 0;
30         private _players = new List;
31     }

既然lambda的语法如此的简介优美，那么我们为什么不使用lambda的语法来写method呢？

1 using System;
2 using System.Collections;
3
4 namespace Orandea.Webgame
5     public class PlayerService
6     {
7         public CreatePlayer(userId, name) =>
8         {
9             var player = {
10                 Id: _playerIndex++,
11                 UserId: userId,
12                 Name: name
13             };
14
15             _players.Add(player);
16
17             return player.Id;
18         }
19
20         public GetPlayer(playerId) => _players.FirstOrDefault(p => p.Id == playerId);
21         public GetPlayerByName(playerName) => _players.FirstOrDefault(p => p.Name == playerName);
22         public GetUserPlayer(userId) => _players.FirstOrDefault(p => p.UserId == userId);
23
24         private _playerIndex = 0;
25         private _players = new List;
26     }

哦，天哪，原来c#还可以这么简洁

加上Pattern Match

现在没有了重载，真是举步维艰啊，写程序真是太麻烦了。但是，别着急，之所以取消了重载这个非常好用的功能，是因为我们要加上一个比重载还要好用的功能：模式匹配：

1 using System;
2 using System.Collections;
3
4 namespace Orandea.Webgame
5     public class PlayerService
6     {
7         public CreatePlayer(userId, name)
8         {
9             var player = {
10                 Id: _playerIndex++,
11                 UserId: userId,
12                 Name: name
13             };
14
15             _players.Add(player);
16
17             return player.Id;
18         }
19
20         public GetPlayer("playerId", playerId) => _players.FirstOrDefault(p => p.Id == playerId);
21         public GetPlayer("playerName", playerName) => _players.FirstOrDefault(p => p.Name == playerName);
22         public GetPlayer("userId", userId) => _players.FirstOrDefault(p => p.UserId == userId);
23
24         private _playerIndex = 0;
25         private _players = new List;
26     }

哇，这样的c#好美啊。

使用C++式的访问控制描述符形式

C#的方式确实挺好的，但是，这样容易让人把public的和private的东西交错放置，这就太乱了，所以使用C++形式的访问控制描述符吧：

1 using System;
2 using System.Collections;
3
4 namespace Orandea.Webgame
5     public class PlayerService
6     {
7         public:
8             CreatePlayer(userId, name)
9             {
10                 var player = {
11                     Id: _playerIndex++,
12                     UserId: userId,
13                     Name: name
14                 };
15
16                 _players.Add(player);
17
18                 return player.Id;
19             }
20
21             GetPlayer("playerId", playerId) => _players.FirstOrDefault(p => p.Id == playerId);
22             GetPlayer("playerName", playerName) => _players.FirstOrDefault(p => p.Name == playerName);
23             GetPlayer("userId", userId) => _players.FirstOrDefault(p => p.UserId == userId);
24
25         private:
26             _playerIndex = 0;
27             _players = new List;
28     }

哇，这真的好清晰，好美啊

加上动态属性吧

神马？那indexer情何以堪？好吧，那就先忘记indexer吧，把我们亲爱的动态属性先弄到再说：

1 using System;
2 using System.Collections;
3
4 namespace Orandea.Webgame
5     public class PlayerService
6     {
7         public:
8             CreatePlayer(userId, name)
9             {
10                 var player = {
11                     Id: _playerIndex++,
12                     UserId: userId,
13                     Name: name
14                 };
15
16                 _players.Add(player);
17
18                 return player.Id;
19             }
20
21             GetPlayer(field, playerId) => _players.FirstOrDefault(p => p[field] == playerId);
22
23         private:
24             _playerIndex = 0;
25             _players = new List;
26     }

加上Guard吧

万一有人不怀好意，使用其他ws的参数来攻击怎么办？加上Guard吧：

1 using System;
2 using System.Collections;
3
4 namespace Orandea.Webgame
5     public class PlayerService
6     {
7         public:
8             CreatePlayer(userId, name)
9             {
10                 var player = {
11                     Id: _playerIndex++,
12                     UserId: userId,
13                     Name: name
14                 };
15
16                 _players.Add(player);
17
18                 return player.Id;
19             }
20
21             GetPlayer(field, playerId)
22                 when (field == "Id" || field == "UserId" || field == "Name")
23                 => _players.FirstOrDefault(p => p[field] == playerId);
24
25         private:
26             _playerIndex = 0;
27             _players = new List;
28     }

加上in关键字吧

哦，天哪，这太丑陋了，就不能弄个好看点的东西？

唔～～～那就加上in关键字吧：

1 using System;
2 using System.Collections;
3
4 namespace Orandea.Webgame
5     public class PlayerService
6     {
7         public:
8             CreatePlayer(userId, name)
9             {
10                 var player = {
11                     Id: _playerIndex++,
12                     UserId: userId,
13                     Name: name
14                 };
15
16                 _players.Add(player);
17
18                 return player.Id;
19             }
20
21             GetPlayer(field, playerId)
22                 when (field in ["Id", "UserId", "Name"])
23                 => _players.FirstOrDefault(p => p[field] == playerId);
24
25         private:
26             _playerIndex = 0;
27             _players = new List;
28     }

恩，今天就先到这里吧，到下一节，我们加上一些消息通讯的东西，瓦咔咔

posted on 2010-11-02 15:08 TonyHuang 阅读(1833) 评论(26) 编辑收藏举报

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