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C# 学习笔记 06:对象的出生证明:构造函数(Constructor)

  • 2026-01-15 23:01:34
C# 学习笔记 06:对象的出生证明:构造函数(Constructor)

C# 学习笔记 06:对象的出生证明:构造函数(Constructor)

开篇:皮皮的「次品工厂」

皮皮最近很烦。

他已经会写 Monster 类了, 但总是忘东忘西

有时候怪物 new 出来了, 却忘了给它设血量。

结果游戏一跑—— 勇者一刀下去,怪物当场消失。 不是被秒,是血量默认 0

皮皮崩溃了:

“能不能让怪物一出生就有血量? 我不想再造这种半成品了!”

瓜瓜点点头:

“可以。 给它们办张出生证明就行。”

这个东西,

叫 构造函数(Constructor)


第一关:构造函数到底是干嘛的?

回忆一下我们之前的流程:

  • new 一个对象
  • 再一行行给它补属性
// 🚫 旧时代:先出生,再补手续Monster m = new Monster(); // 空壳m.Name = "史莱姆";m.Hp = 100;

问题很明显:

  • 容易忘
  • 顺序还不能错
  • 对象有一瞬间是“不完整”的

构造函数解决的就是这个问题。

一句话解释:

构造函数 = 对象在 new 的那一刻,自动执行的初始化代码


构造函数的两个死规矩

它长得像方法, 但规矩很怪:

  • 名字必须和类名一模一样
  • 不写返回值(连 void 都没有)
publicclassMonster{publicstring Name;publicint Hp;// 👶 出生瞬间自动执行publicMonster(string name, int hp)    {        Name = name;        Hp = hp;        Console.WriteLine($"{Name} 诞生了,血量 {Hp}");    }}

从这一刻开始, 怪物不可能再“裸奔出生”


第二关:一气呵成的召唤

现在皮皮召唤怪物,只需要一句话:

Monster boss = new Monster("魔王"1000);

发生了什么?

  • new
  • 构造函数立刻执行
  • 名字、血量一次性到位

而且很关键的一点:

// Monster m = new Monster(); // ❌ 报错

这行现在不允许了。

原因很简单:

你定义了构造函数, 编译器就要求你必须按规则投料

🧙‍♂️ 瓜瓜的比喻:

构造函数就是工厂入口。 不给参数, 不给你出货。


第三关:不同出生套餐(重载)

皮皮很快又不满意了:

“大多数时候我只想要个杂兵, 每次都写 new Monster("杂兵", 50) 好累。”

这个需求很真实。

解决办法是一个老朋友的新用法: 👉 重载(Overloading)

规则只有一条:

同名方法,参数不同,就是不同版本。

构造函数也可以有多个:

publicclassMonster{publicstring Name;publicint Hp;// 套餐 A:自定义publicMonster(string name, int hp)    {        Name = name;        Hp = hp;    }// 套餐 B:默认杂兵publicMonster()    {        Name = "普通史莱姆";        Hp = 10;    }}

现在怎么用都行:

Monster boss = new Monster("魔王"9999);Monster mob  = new Monster(); // 自动走默认套餐

编译器会根据你传的参数自己选该用哪一个构造函数

你不用管。


本期总结

到这里,我们已经掌握了对象出生的完整流程:

  • 构造函数:对象诞生瞬间执行
  • 强制初始化:防止残次品对象
  • 重载:多种出生方式,多种套餐

这一步之后, 你的代码会明显更稳、更干净


课后思考(重要)

如果构造函数参数也叫 Name, 属性也叫 Name

publicMonster(string Name){    Name = Name; // 😵}

这里到底谁是谁?

C# 提供了一个关键字:this用来指代当前对象自己

你知道该怎么写吗?


下期预告

皮皮看着自己的 Monster 类,又犯愁了。

“我要做龙、做僵尸、做骷髅。 它们都有名字、有血量, 难道要全部复制一份?”

不用。

下一期,我们学习👉继承(Inheritance)

父与子的羁绊, 让代码量直接砍半。

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  1. CONNECT:[ UseTime:0.000510s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000478s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002566s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000244s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000441s ]
  6. SELECT * FROM `set` [ RunTime:0.002166s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000537s ]
  8. SELECT * FROM `article` WHERE `id` = 460493 LIMIT 1 [ RunTime:0.000362s ]
  9. UPDATE `article` SET `lasttime` = 1768497125 WHERE `id` = 460493 [ RunTime:0.006222s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.002944s ]
  11. SELECT * FROM `article` WHERE `id` < 460493 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000418s ]
  12. SELECT * FROM `article` WHERE `id` > 460493 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000334s ]
  13. SELECT * FROM `article` WHERE `id` < 460493 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005174s ]
  14. SELECT * FROM `article` WHERE `id` < 460493 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008794s ]
  15. SELECT * FROM `article` WHERE `id` < 460493 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007557s ]
0.146250s