C# How to Handle Exception Smartly.???

[sudhivns]

Hi Pals,

Application main(), handles the default Exception.
However at Method(function) level i want to catch certain exceptions.
certain method X(), using all System.IO.Path,System.IO.Directory etc objects.
Is it wise to catch all exception thrown by these classes/methods.
Then my method looks like.

void X()
{
try {
....
}
catch(IOException ex)
catch(UnauthorizedAccessException ex)
catch(ArgumentException ex)
catch(ArgumentNullException ex)
catch(PathTooLongException ex)
catch(DirectoryNotFoundException ex)
catch(NotSupportedException ex)


}

Im looking at the way how can i organize the exception handling in method X().
using excessive Catch block do not want to exploit my code.

[Plater]

I'm not sure what you're asking but...
You will always want to catch exceptions, however sometimes Exceptions you catch aren't a "big deal".
Like with HttpWebRequest, if you get 404 or other bad status message an exception is thrown. You will want to trap it, but don't need to do anything with it specifically.

The Exception base class will catch everything.

Consider:

catch (Exception ee)
{
   if (ee.GetType()==typeof(NullReferenceException))
   {
      //do something
   }
   else
   {
      //do nothing
   }
}
 

is the same as:

catch(NullReferenceException nre)
{
   //do something
}
catch(Exception ee)
{
   //do nothing
}
 

[sudhivns]

Thanks Pal.

I wanted no to have many catch clause in my code.
So i have to fall back for Exception generic class.
catch(Exception ex)
{
// use ex.Message....
}

[r035198x]

Thanks Pal.

I wanted no to have many catch clause in my code.
So i have to fall back for Exception generic class.
catch(Exception ex)
{
// use ex.Message....
}

Well in that case then that is not the "smart" way of handling exceptions.
If you know the actual(exact) expection that can be throw, then catch it separately and handle it in a manner specific only to that exception.
e.g If the exception is security related, then hadle it differently from how you would handle incorrect input from the user.