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C# 学习笔记 11:给程序穿上防弹衣 —— 异常处理 (Try / Catch)

  • 2026-02-07 01:23:51
C# 学习笔记 11:给程序穿上防弹衣 —— 异常处理 (Try / Catch)

C# 学习笔记 11:给程序穿上防弹衣 —— 异常处理 (Try / Catch)

💥 开篇:皮皮的“玻璃心”程序

皮皮(Pipi)写了一个伤害计算器。 逻辑非常简单:

每只怪物的伤害 = 总伤害 ÷ 怪物数量

int totalDamage = 1000;int monsterCount = 0// 假设这次刚好没有怪物int damagePerMonster = totalDamage / monsterCount; // 💀 砰!

程序瞬间崩溃, 屏幕弹出一行冰冷的文字:

System.DivideByZeroException

游戏直接关闭。

皮皮(惊恐):“我只是算错了一个数而已,为什么整个程序要陪葬?!”

瓜瓜(淡定):“因为你没给它穿防护装备。 程序一旦遇到无法处理的意外,默认行为就是——原地去世。”


第一关:危险动作请围观(try

在 C# 里,我们可以提前告诉程序:

“下面这段代码有风险,先别慌。”

这就是 try 的作用。

try{// 🚧 危险操作区}

📌 一句人话:

try = 我知道这事可能翻车,但我想试试


第二关:安全气囊弹出(catch

光“尝试”还不够, 你还得告诉程序:

“如果真的翻车了,该怎么办。”

这就是 catch

try{int totalDamage = 1000;int monsterCount = 0;int damagePerMonster = totalDamage / monsterCount;    Console.WriteLine("计算完成!");}catch (Exception ex){    Console.WriteLine("哎呀!出错了!");    Console.WriteLine($"错误原因:{ex.Message}");}Console.WriteLine("游戏继续运行...");

瓜瓜解释一下发生了什么:

  • 程序运行到除以 0 → 发生异常
  • 直接跳出 try
  • 像坐滑梯一样滑进 catch
  • 执行补救逻辑
  • 程序没有崩溃,继续往下跑

📌 重点记住:

try 里一旦出事,后面的代码不会再执行


第三关:对症下药(精确捕获异常)

皮皮学会了 catch (Exception),觉得自己已经天下无敌了。 不管什么错误,统一一句:

“出错了!”

结果—— 文件丢了,提示“除以零”; 断网了,提示“除以零”。

瓜瓜摇头:“你这是头疼医脚。异常也是有类型的。”

C# 允许你针对不同异常,写不同的处理方案

try{string content = File.ReadAllText("config.txt");int number = int.Parse(content);int result = 100 / number;}catch (FileNotFoundException){    Console.WriteLine("配置文件没找到,请检查路径!");}catch (DivideByZeroException){    Console.WriteLine("配置里的数字不能为 0!");}catch (Exception ex){    Console.WriteLine($"发生未知错误:{ex.Message}");}

⚠️ 非常重要的规则

越具体的异常,越要写在前面

❌ 错误示范:

catch (Exception) { }catch (DivideByZeroException) { } // 永远进不来

记忆口诀:

小网先捞,大网兜底


第四关:善后必做(finally

有些事情,不管成功还是失败,都必须做。

比如:

  • 打开文件 → 必须关闭
  • 占用资源 → 必须释放

这时候就该 finally 出场了。

FileStream file = null;try{    file = File.Open("save.data", FileMode.Open);// 读档逻辑(这里可能会崩)}catch (Exception){    Console.WriteLine("读档失败!");}finally{//  无论如何,这里一定会执行if (file != null)    {        file.Close();        Console.WriteLine("文件已关闭。");    }}

一句话总结:

finally = 打扫战场,不接受任何借口

即使你在 try 里 returnfinally 也会在你“离开前”强制执行一次


总结:异常处理真正教你的是什么?

今日战利品

  1. 异常(Exception):程序运行中的意外事件
  2. try:标记高风险代码
  3. catch:定义出事后的应急方案
  4. finally:无论如何都要执行的清理逻辑

真正的编程成熟标志:

不是“永不出错”, 而是——出错了也能优雅地活下来


课后思考(面试高频)

如果在 try 里写了 returnfinally 里的代码还会执行吗?

答案:finally 非常执着, 你走之前,它一定要最后跑一遍。


下期预告

我们在 finally 里频繁提到了:

  • 文件
  • 读写
  • 保存数据

皮皮想做一个真正的存档系统: 关掉游戏,下次还能接着玩。

👉 下一期:文件操作(File I/O)让你的数据,真正活在硬盘里。

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  1. CONNECT:[ UseTime:0.000754s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000676s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000304s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000252s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000500s ]
  6. SELECT * FROM `set` [ RunTime:0.000201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000505s ]
  8. SELECT * FROM `article` WHERE `id` = 464214 LIMIT 1 [ RunTime:0.000431s ]
  9. UPDATE `article` SET `lasttime` = 1770402706 WHERE `id` = 464214 [ RunTime:0.010754s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000412s ]
  11. SELECT * FROM `article` WHERE `id` < 464214 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000567s ]
  12. SELECT * FROM `article` WHERE `id` > 464214 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000507s ]
  13. SELECT * FROM `article` WHERE `id` < 464214 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000602s ]
  14. SELECT * FROM `article` WHERE `id` < 464214 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003311s ]
  15. SELECT * FROM `article` WHERE `id` < 464214 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000961s ]
0.088606s