Throwing E_FAIL errors so edit operation is aborted

Question

I need to abort an edit operation somewhere, determined by a certain condition.

Heres the code I'm using:

    private const int E_FAIL = -2147467259;

    private void _Events_OnDeleteFeature(IObject obj)
    {
        _logger.Info("Iniciando handler de OnDeleteFeature...");
        try
        {
            // do we need to abort it?
            // this method returns a COMException with code = E_FAIL; 
            if (DoINeedToAbort(obj, geaEditOperation.DELETE))
                return;
        }
        catch (COMException comEx)
        {
            throw comEx;
        }
    }

This is not showing me the appropriate message and it's not aborting the operation. BTW, this event is a IEditEvent, and it's being fired ok. The problem is to abort the operation, without calling _editor.AbortEditOperation(), which gives me an ugly message.

This is where I looked it in ESRIs manual (I know that the following applies to class extensions)

http://resources.esri.com/help/9.3/arcgisengine/ArcObjects/ao_start.htm#esriGeodatabase/IObjectClassEvents.htm

Any tips?

Answer 1

I am not sure if I understand your problem correctly, but when throwing COM exceptions, it is generally best to use the COMException constructor overload which allows you to set both error message and error code.

Throwing the exception with E_FAIL error code is then something along those lines:

throw new COMException("Error", E_FAIL);

Answer 2

According to the documentation on editor events, Managing edit sessions and edit operations, it says "Currently, there is no opportunity to abort the edit operation. Do not call AbortOperation inside any editor event, including BeforeStopOperation."

So the answer is you need to do it in an ObjectClass event.