Can the orignial exception type be found in a rethrown generic exception?

I'm trying to catch a user defined permission exception - i.e. a user does something their level of system access won't allow, permission exception is thrown. My problem is, the exception i开发者_JS百科s caught and then rethrown as a genertic System.Exception.

Is there any way I can deduce the original exception type, without resorting to string comparisons, like if ex.ToString.Contains("Permission denied") Then ...?

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You could use the InnerException property of the base Exception class, and loop until null

        try
        {
        }
        catch (Exception e)
        {
            while (e.InnerException != null)
                e = e.InnerException;

            Console.WriteLine(e.Message);
        }

---

Something like this:

Try


Catch e as Exception
    While e IsNot Nothing AndAlso Not TypeOf(e) is PermissionException
       e = e.InnerException;
    End While

    ' Rethrow if we can't handle it
    If e Is Nothing Then Throw 

    ' do whatever needs to be done when PermissionException is thrown

End Try