如果在C＃中的Catch块发生异常会发生什么。此外，这将是主叫结果在这种情况下 [英] What happens if an exception occurs in Catch block in C#. Also what would be the caller result in that case

问题描述

这是一个面试问题，很简单，但我没有信心的答案。

It was an interview question, quite simple, but I am not confident about the answer.

如果在catch块发生异常会发生什么？

What happens if an exception occurs in catch block ?

我想举一个例子小前卫的面试官试图问我，请纠正我的程序，如果它不编译，我真的很新的这一点。底线是，如果在捕捉发生异常，会是怎样的来电INT帽子的情况下，价值会发生什么。

I am trying to give an example small prog of what the interviewer was trying to ask me, please correct my program if it is not compiling, I am really new to this. Bottom line is what happens if an exception occurs in Catch and what will be the value of caller int hat case.

例如，我有以下几点：

double Calculate(int x)
{
    try
    {
        x = x/2;
    }
    catch(Exception ex)
    {
        Console.Writeline("Message: "+ ex.Message);
    }
    finally
    {
      x = 10;
    }
    return x;
}

double myResult = Calculate(x); //x can be any number or 0 for example

现在有两个问题：

1. 如果异常在catch块发生，会发生什么？另外，如何解决？ （这是一个简单的面试官在问类似的问题的例子）。

1. What happens if an exception happens in catch block ? Also, how to resolve it ? (This is simple example of what the interviewer was asking a similar question).

会发生什么事，以myResult中如果有异常的计算（x）的方法发生在所有的情况下，什么将是它的价值？ （请解释用一个例子任何情况下）

What will happen to myResult if an exception happens in Calculate(x) method ?What will be its value in all cases ? (Please explain every case with an example)

我想有一个详细的解释也明白这一点。

I would like to understand this with a detailed explanation too.

感谢你了。

推荐答案

扔在一个捕捉异常块的行为一样抛出没有它的异常 - 它会上推，直到它被夹在一个较高的水平catch块，如果存在的话。这样做是很正常的，如果你想改变或包装原始异常;即：

An exception thrown in a catch block will behave the same as an exception thrown without it - it will go up the stack until it is caught in a higher level catch block, if one exists. Doing this is quite normal if you want to change or wrap the original exception; i.e.:

public void MyStartMethod
{
    try
    {
        //do something
        MyBadMethod();
    }
    catch(MySpecialException mse)
    {
        //this is the higher level catch block, specifically catching MySpecialException 
    }
}

public void MyBadMethod()
{
    try
    {
        //do something silly that causes an exception
    }
    catch (Exception e)
    {
        //do some logging

        throw new MySpecialException(e);
    }
}

public class MySpecialException : Exception 
{   
    public MySpecialException(Exception e) { ...etc... }
}

在你的情况， myResult中将有什么价值它面前，如果它甚至还在范围内。

In your case, myResult will have whatever value it had before, if it's even still in scope.

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