“扔”是什么？靠自己做什么？ [英] What does "throw;" by itself do?

问题描述

可能重复：

投掷新Exception（）与投掷之间的差异

仅仅获得

What would be the point of just having

catch (Exception)
{
    throw;
}

这是做什么的？

推荐答案

throw 关键字本身只是重新引发 catch 上面的语句。如果您要执行一些基本的异常处理（例如补偿操作，如回滚事务），然后将异常重新引发到调用方法中，这将很方便。

By itself, the throw keyword simply re-raises the exception caught by the catch statement above. This is handy if you want to do some rudimentary exception handling (perhaps a compensating action like rolling back a transaction) and then rethrow the exception to the calling method.

此方法与在变量中捕获异常并抛出该实例相比，它具有一个显着的优势：它保留了原始调用堆栈。如果先捕获（Exception ex）然后抛出ex，则调用堆栈将仅从该throw语句开始，并且您将丢失原始错误的方法/行。

This method has one significant advantage over catching the exception in a variable and throwing that instance: It preserves the original call stack. If you catch (Exception ex) and then throw ex, your call stack will only start at that throw statement and you lose the method/line of the original error.

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