try..catch problem

hzjbwl

That big brother tell me
try
{
  ...
}
catch (Exception ex)
{
   throw ex;
}
What's the difference between not adding try..catch, mainly because I don't understand what to do after catching the exception, then
What's the use of rethrowing?

xing_532

No error will be reported on the try..catch page

熊出没请注意

Can display your customized error message after getting an exception

xing_532

You can also implement some functional operations after reporting an error (that is, in Catch)

hzjbwl

The problem is that the same exception is thrown again after try,

sulfuresser

Can display your customized error message after getting an exception

Make users get the teaching experience!

hzjbwl

cath is about to throw an ex;

614310

Is throwing the same exception, but this time it is caught by the outer try
In this way, you can focus on exceptions.

hzjbwl

Maybe I didn't make it clear, my doubt is, after catching the exception, do a rethrow
The same abnormal action, nothing else, so its upper Yi layer to catch the exception,
If this processing is not added, if there is an exception, it is also processed by the previous layer, and it throws
Is the same exception, so what does this try..cacth do?

hzjbwl

If it is not used by the outer layer, it will be useless. I saw this sentence from the demo in the Microsoft lecture.