VB.NET中的错误处理 [英] Error Handling in VB.NET

问题描述

大家好
我在VB.net中遇到有关错误处理"的问题
抛出异常"和抛出新异常"是什么意思?
以及何时应该使用它?
我了解使用Try ... Catch ... Finally
但是我不知道使用投掷"吗?

请帮忙.

Hi everybody
I got a question about "Error Handling" in VB.net
what''s the meaning of "Throw Exception" and "Throw new Exception"?
and When we should use it?
I understand the using of Try...Catch...Finally
But I don''t know the using of "Throw"?

Please help..

推荐答案

Throw可让您在应用程序中引发自己的异常，然后可以使用try..catch捕获异常.您还可以重新引发捕获的异常:

Throw lets you raise your own exceptions within your application which can then be caught with try..catch. You can also re-throw caught exceptions:

try
{
  myBuggyCode.myFlakyMethod("some parameter bla bla");
}
catch(Exception ex)
{
  logger.Error(ex);

  throw ex;
}

在jim的答案上稍作扩展.

throw用于显示已经引发的异常，并且经常被捕获在catch块中.

throw new ....
通常用于以下情况:

To expand a little on jim''s answer.

throw is used to surface an Exception that has already been raised, and often caught in a catch block.

throw new ....
is often used in circumstances like:

if (divisor == 0)
{
  throw new DivideByZeroException("Naughty, naughty");
}

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