Event Receiver CancelWithRedirectUrl issue with multiple selected list items

Question

I've got my event receiver (itemdeleting) working almost exactly the way I'd like it to.

Upon certain conditions in the itemdeleting event, I am setting the status to CancelWithRedirectUrl and setting the redirect URL like so:

properties.Status = SPEventReceiverStatus.CancelWithRedirectUrl;
properties.RedirectUrl = "/_layouts/AppPage.aspx";

The only problem I'm experiencing now is that if a user selects and deletes more than 1 item at a time. The event receiver apparently tries to redirect twice and I get an error stating the following (twice as you see):

The server has encountered the following error(s):
The request was redirected to ...

The server has encountered the following error(s):
The request was redirected to ...

If I debug I can see my event receiver is actually executing twice. Is there some graceful way to handle this?

Answer 1

I am not certain this will work but I believe that if you disable event firing it does so for the EventReceiver. Try wrapping your code in a disable event firing scope.

http://adrianhenke.wordpress.com/2010/01/29/disable-item-events-firing-during-item-update/ Using this class:

/// <summary>
/// Disabled item events scope
/// </summary>
/// <see cref="http://adrianhenke.wordpress.com/2010/01/29/disable-item-events-firing-during-item-update/"/>
class DisabledItemEventsScope : SPItemEventReceiver, IDisposable
{
    bool oldValue;

    public DisabledItemEventsScope()
    {
        this.oldValue = base.EventFiringEnabled;
        base.EventFiringEnabled = false;
    }

    #region IDisposable Members

    public void Dispose()
    {
        base.EventFiringEnabled = oldValue;
    }

    #endregion
}

And call it like this:

using (DisabledItemEventsScope scope = new DisabledItemEventsScope())
{
    //Redirect and any other code.
}