exception - 多次 try-catch 还是一次？

Question

通常情况下，我会这样做:

try
{
    code

    code that might throw an anticipated exception you want to handle

    code

    code that might throw an anticipated exception you want to handle

    code
}
catch 
{

}

这样做有什么好处吗？

code

try
{
    code that might throw an anticipated exception you want to handle
}
catch
{
}

code

try
{
    code that might throw an anticipated exception you want to handle
}
catch
{
}

code

更新:

我最初提出这个问题时引用了 C#，但正如 A. Levy 评论的那样，它可以适用于任何异常处理语言，所以我让标签反射(reflect)了这一点。

Answer 1

这要看情况。如果您想为特定错误提供特殊处理，请使用多个 catch block :

try
{ 
    // code that throws an exception
    // this line won't execute
}
catch (StackOverflowException ex)
{
    // special handling for StackOverflowException 
}
catch (Exception ex)
{
   // all others
}

但是，如果目的是处理异常并继续执行，请将代码放在单独的 try-catch block 中:

try
{ 
    // code that throws an exception

}
catch (Exception ex)
{
   // handle
}

try
{ 
    // this code will execute unless the previous catch block 
    // throws an exception (re-throw or new exception) 
}
catch (Exception ex)
{
   // handle
}