如何使用try和catch捕获c#中的所有异常? [英] How to catch all exceptions in c# using try and catch?

问题描述

我想写一些尝试捕获任何类型或异常的代码，这样的代码够用吗(在Java中就是这样)?

I want to write some try and catch that catch any type or exception, is this code is enough (that's the way to do in Java)?

try {
code....
}
catch (Exception ex){}

或者应该是

try {
code....
}
catch {}

?

推荐答案

这两种方法都将捕获所有异常.您的两个代码示例之间没有显着差异，只是第一个示例将生成编译器警告，因为已声明但未使用 ex .

Both approaches will catch all exceptions. There is no significant difference between your two code examples except that the first will generate a compiler warning because ex is declared but not used.

但是请注意，某些例外是特殊的，会自动重新抛出.

But note that some exceptions are special and will be rethrown automatically.

ThreadAbortException 是可以捕获的特殊异常，但是它将在catch块的末尾自动再次引发.

ThreadAbortException is a special exception that can be caught, but it will automatically be raised again at the end of the catch block.

http://msdn.microsoft.com/en-us/library/system.threading.threadabortexception.aspx

如评论中所述，捕获并忽略所有异常通常是一个非常不好的主意.通常，您想执行以下操作之一:

As mentioned in the comments, it is usually a very bad idea to catch and ignore all exceptions. Usually you want to do one of the following instead:

• 捕获并忽略您知道不会致命的特定异常.

• Catch and ignore a specific exception that you know is not fatal.

catch (SomeSpecificException)
{
    // Ignore this exception.
}

捕获并记录所有异常.

Catch and log all exceptions.

catch (Exception e)
{
    // Something unexpected went wrong.
    Log(e);
    // Maybe it is also necessary to terminate / restart the application.
}

捕获所有异常，进行一些清理，然后重新抛出异常.

Catch all exceptions, do some cleanup, then rethrow the exception.

catch
{
    SomeCleanUp();
    throw;
}

请注意，在最后一种情况下，使用 throw; 而不是 throw ex; 抛出异常.

Note that in the last case the exception is rethrown using throw; and not throw ex;.

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