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C# 学习笔记 16:拯救魔法数字的终极武器——枚举 (Enum)

  • 2026-02-28 15:34:49
C# 学习笔记 16:拯救魔法数字的终极武器——枚举 (Enum)

C# 学习笔记 16:拯救魔法数字的终极武器——枚举 (Enum)

开篇:皮皮的“加密”代码

皮皮(Pipi)正在复习他上个月写的角色控制器代码,结果发现一段“考古级”逻辑:

if (playerState == 1){    speed = 5// 跑?}elseif (playerState == 2){    speed = 10// 冲刺?还是飞?}elseif (playerState == 3// 3 到底是个啥?!{    Die(); }

皮皮(抓头发):“救命啊!这个 1、2、3 到底是什么意思?我当时为什么不写注释?!”

瓜瓜(Guagua):“就算写了注释,每次敲代码还要去翻本子查数字,不觉得累吗?这种凭空出现、没人懂意义的数字,叫——魔法数字(Magic Number)。”

魔法数字的问题只有一个:它让代码失忆。

今天我们就用一把终极武器,彻底拯救它——枚举(Enum)


第一关:什么是枚举?(Define an Enum)

枚举(Enumeration) 是一种值类型(Value Type), 它的核心作用只有一句话:

把冷冰冰的数字,变成人类能看懂的单词。

我们可以这样定义一个枚举:

// ✨ 定义一个枚举(注意:不是 class,而是 enum)publicenum PlayerState{    Idle,   // 发呆    Run,    // 跑    Attack, // 攻击    Dead    // 死亡}

这相当于你为游戏创建了一本“小字典”。

以后谁再看到这些状态,不需要猜数字含义,只需要看单词。


第二关:用“类型”代替“数字”

以前皮皮这样写:

int playerState = 1;

现在我们可以直接升级成:

publicclassPlayer{// 不再是 int,而是枚举类型!public PlayerState State = PlayerState.Idle;publicvoidUpdate()    {if (State == PlayerState.Run)        {            Console.WriteLine("玩家正在奔跑!");        }elseif (State == PlayerState.Dead)        {            Console.WriteLine("Game Over!");        }    }}

代码瞬间变成“可阅读的英语句子”。

而且还有隐藏福利:

  • ✅ IDE 自动提示(不会拼错)
  • ✅ 类型安全(不能随便赋 999)
  • ✅ 语义清晰(半年后看也不迷糊)

这就是“类型的力量”。


第三关:枚举的本质(Under the Hood)

虽然我们用的是单词,但电脑底层只认识数字。

枚举本质上是:

穿着单词马甲的 int

默认规则:

  • 第一个值 = 0
  • 后面依次递增

也就是:

枚举名
实际值
Idle
0
Run
1
Attack
2
Dead
3

强制脱马甲(类型转换)

有时我们需要把枚举和数字互相转换(比如存档)。

// 枚举 -> 数字int stateNumber = (int)PlayerState.Attack;Console.WriteLine(stateNumber); // 输出 2// 数字 -> 枚举int loadedData = 3;PlayerState loadedState = (PlayerState)loadedData;Console.WriteLine(loadedState); // 输出 Dead

⚠️ 注意: 如果数字是 999,也能强制转换成功,但这个值可能不在枚举定义里。

更安全的方式:

if (Enum.IsDefined(typeof(PlayerState), loadedData)){    PlayerState state = (PlayerState)loadedData;}

进阶:自定义数值

publicenum ErrorCode{    NotFound = 404,    ServerCrash = 500,    Unknown = 999}

枚举不仅能表示状态,还能表示:

  • 错误码
  • 等级
  • 类型分类
  • 权限等级
  • UI 页面类型

第四关:枚举的灵魂伴侣 —— switch

当状态很多时,if...else if... 会变得冗长。

这时候请召唤黄金搭档:

👫 Enum + switch

PlayerState currentState = PlayerState.Attack;switch (currentState){case PlayerState.Idle:        Console.WriteLine("播放呼吸动画");break;case PlayerState.Run:        Console.WriteLine("播放跑步动画");break;case PlayerState.Attack:        Console.WriteLine("播放挥剑动画");break;case PlayerState.Dead:        Console.WriteLine("播放倒地动画");break;default:        Console.WriteLine("未知状态!");break;}

💡 小技巧:

在 Visual Studio 中:

switch (currentState)

然后按回车,IDE 会自动帮你补全所有 case。

效率直接起飞


思考进阶:如果状态能叠加呢?

问题来了:

如果角色:

  • 一边跑(Run)
  • 一边开枪(Attack)

普通枚举只能选一个值,那怎么办?

提示关键词:

[Flags]位运算

这叫做“位标志枚举”,我们会在进阶篇学习到。


今日战利品总结

  1. 魔法数字 = 没人知道含义的裸数字。
  2. Enum = 给数字贴上可读标签。
  3. 枚举本质是 int,默认从 0 开始递增。
  4. 可以与 switch 语句完美配合。
  5. 提升:可读性、类型安全、可维护性。

下期预告

我们之前学过:

  • class 是引用类型
  • 枚举是值类型

那问题来了:

如果我只想要一个小型数据结构,比如:

X, Y, Z 坐标

用 class 会不会太重?

下一期,我们将学习:

结构体(Struct)—— class 的轻量级双胞胎兄弟。

皮皮的内存优化之路,正式开始。

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  1. CONNECT:[ UseTime:0.000455s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000919s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000332s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000344s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000453s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000529s ]
  8. SELECT * FROM `article` WHERE `id` = 470756 LIMIT 1 [ RunTime:0.000414s ]
  9. UPDATE `article` SET `lasttime` = 1772297900 WHERE `id` = 470756 [ RunTime:0.000752s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000213s ]
  11. SELECT * FROM `article` WHERE `id` < 470756 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000393s ]
  12. SELECT * FROM `article` WHERE `id` > 470756 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000340s ]
  13. SELECT * FROM `article` WHERE `id` < 470756 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000683s ]
  14. SELECT * FROM `article` WHERE `id` < 470756 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000714s ]
  15. SELECT * FROM `article` WHERE `id` < 470756 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002075s ]
0.076953s