finally

.Net Framework: Finally block is not being called when the exception is not being caught [duplicate]

由 大城市里の小女人 提交于 2021-02-20 19:07:32
问题 This question already has answers here : .NET Core: Finally block not called on unhandled exception on Linux (2 answers) What are the uses of “using” in C#? (29 answers) Closed 3 months ago . A simple console application, in Visual Studio 2019, .Net Framework 4.7, Windows: static void Main(string[] args) { try { Console.WriteLine("In try"); throw new IndexOutOfRangeException(); } finally { *// Surprisingly this part is not being executed.* Console.WriteLine("In finally"); Console.ReadLine();

Python: Is it possible to access the return value inside the `finally` clause?

由 一世执手 提交于 2021-02-07 11:38:13
问题 I have a return statement inside a try clause: def f(): try: return whatever() finally: pass # How do I get what `whatever()` returned in here? Is it possible to get the return value inside the finally clause? This is more of a theoretical question, so I'm not looking for a workaround like saving it to a variable. 回答1: No, it isn't - the finally clause's content is independent from return mechanics; if you do want to see what value is returned you'd have to do as you mentioned and explicitly

Java异常处理（try、catch、finally使用）

由 余生颓废 提交于 2020-11-03 11:09:58
直接上代码，先贴下面测试需要调用的方法： public static void enterTryMethod() { System.out.println("enter after try field"); } public static void enterExceptionMethod() { System.out.println("enter catch field"); } public static void enterFinallyMethod() { System.out.println("enter finally method"); } 1. 抛出Exception，没有finally，当catch遇上return public static int catchTest() { int res = 0; try { res = 10 / 0; // 抛出Exception，后续处理被拒绝 enterTryMethod(); return res; // Exception已经抛出，没有获得被执行的机会 } catch (Exception e) { enterExceptionMethod(); return 1; // Exception抛出，获得了调用方法并返回方法值的机会 } } 后台输出结果： enter catch field 1 2.

java异常机制

由 柔情痞子 提交于 2020-03-25 08:32:14
try…catch…finally恐怕是大家再熟悉不过的语句了，而且感觉用起来也是很简单，逻辑上似乎也是很容易理解。不过，我亲自体验的“教训”告诉我，这个东西可不是想象中的那么简单、听话。不信？那你看看下面的代码，“猜猜”它执行后的结果会是什么？不要往后看答案、也不许执行代码看真正答案哦。如果你的答案是正确，那么这篇文章你就不用浪费时间看啦。 package Test; public class TestException { public TestException() { } boolean testEx() throws Exception { boolean ret = true; try { ret = testEx1(); } catch (Exception e) { System.out.println( "testEx, catch exception"); ret = false; throw e; } finally { System.out.println( "testEx, finally; return value=" + ret); return ret; } } boolean testEx1() throws Exception { boolean ret = true; try { ret = testEx2(); if (!ret) {

Are there guarantees in C# that the using statement won`t inherit the try + finally combinations issues? [duplicate]

由 浪尽此生 提交于 2020-03-21 07:17:49
问题 This question already has answers here : Why Dispose is not called even with using-statement? (1 answer) If I return out of a try/finally block in C# does the code in the finally always run? (4 answers) Closed last month . Are there guarantees in C# that the using statement won`t inherit the try + finally combinations issues? The question naturally follows the discussion from other here. According to the documentation: using (var font1 = new Font("Arial", 10.0f)) { byte charset = font1

Are there guarantees in C# that the using statement won`t inherit the try + finally combinations issues? [duplicate]

由 不打扰是莪最后的温柔 提交于 2020-03-21 07:17:18
问题 This question already has answers here : Why Dispose is not called even with using-statement? (1 answer) If I return out of a try/finally block in C# does the code in the finally always run? (4 answers) Closed last month . Are there guarantees in C# that the using statement won`t inherit the try + finally combinations issues? The question naturally follows the discussion from other here. According to the documentation: using (var font1 = new Font("Arial", 10.0f)) { byte charset = font1

异常机制及其处理

由 半城伤御伤魂 提交于 2020-03-15 11:43:10
一、异常 　　 异常就是一个表示阻止执行正常进行的错误或者情况。比如数组下标越界访问异常：ArrayIndexOutOfBoundsException;文件不存在异常：FileNotFoundException等等。 抛出异常与异常处理的例子：除数为0异常。 package demo; import java.util.Scanner; /** * Created by luts on 2015/11/28. */ public class QuotientWithException { public static void main(String[] args){ Scanner input = new Scanner(System.in); System.out.println("输入两个数:"); int num1 = input.nextInt(); int num2 = input.nextInt(); try { if (num2 == 0) throw new ArithmeticException("除数不能为0"); System.out.println(num1 + " / " + num2 + " = " + (num1 / num2)); } catch (ArithmeticException ex){ System.out.println("除数不能为0

Why finally block may not execute when exception is thrown?

由 允我心安 提交于 2020-02-23 08:32:19
问题 For a long time I thought that it allows me to free up all the resources in the finally block and I thought that if an exception happens in the try block, then the resources will still be free up in the finally block. But that seems not to be the case. I have the following piece of code: using System; public sealed class Program { public static void Main() { try { int zero = 0; int i = 1/zero; } finally { Console.WriteLine("divide by zero"); //the line is never called } } } I never reach the

避免在 finally 语句块中使用 return 语句

由 我是研究僧i 提交于 2020-02-11 17:20:21
在try-catch-finally语句块中，finally语句块中的return/抛出异常（立即结束语句）的优先级最高，程序会优先返回finally语句块中的立即结束语句的结果，此时try-catch语句块中的return/抛出异常（立即结束语句）的结果无效，因为被覆盖了。 参考： https://juejin.im/entry/5955c3215188250d841c9974 https://beginnersbook.com/2013/05/java-finally-return/ 来源： CSDN 作者： yrk0556 链接： https://blog.csdn.net/yrk0556/article/details/104258705
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