Re: Retrieve thrown exception in using (disposable) cleanup

From: Alexander Shirshov (alexander_at_omnitalented.com)
Date: 03/22/05 

Date: Tue, 22 Mar 2005 10:06:08 +0700

Emil,

It's generally suggested not to throw exceptions in Dispose:

http://blogs.msdn.com/clyon/archive/2004/09/23/233464.aspx

But if you insist... Can you save ErrorException in a field until Dispose
method called?

class MySession : : IDisposable
{
    ErrorException thrownEx = null;

   Dispose()
   {
      if (mytransaction.IsOpen)
         throw new SessionException("Transaction not closed!", thrownEx);
   }
}

OtherFunc()
{
   using (MySession session)
  {
     :
    thrownEx = new ErrorException("whoops!");
    throw thrownEx;
     session.Commit();
  }
}

HTH,
Alexander

"Emil Astrom" <emil_astrom(at)hotmail.com> wrote in message
news:uU9o$CnLFHA.3760@TK2MSFTNGP12.phx.gbl...
> Hi!
>
> I wonder if there's a way to retrieve information about thrown, not yet
> handled exceptions. My situation is similar to the code below:
>
> class MySession : IDisposable
> {
> :
> :
> Dispose()
> {
> if (mytransaction.IsOpen)
> throw new SessionException("Transaction not closed!", XXX);
> }
> }
>
> OtherFunc()
> {
> using (MySession session)
> {
> :
> throw new ErrorException("whoops!");
> session.Commit();
> }
> }
>
>
> What I want to do is to have a Dispose() method that can include the
> already thrown exception as an inner exception in its own exception that
> it needs to throw if it's called prematurely. What I would like to have in
> the example above is a thrown SessionException with the ErrorException
> instance in the InnerException property. Can this be done?
>
> If not, then I can only see two options:
> * not include ErrorException in my SessionException when I throw it, but
> that means losing the original error
> * not throw an exception in my Dispose method at all, but that means not
> having any error messages for improper use of the MySession class, e.g.
> forgetting to call Commit().
>
> Maybe someone have more (and better) alternatives? All suggestions are
> greatly appreciated!
>
> Regards,
>
> Emil
>

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