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We inherit SPItem Event Receiver and IDisposable, SPItem Event Receiver will give us access to the base properties in the event receiver and IDisposable will give us a Dispose method (which comes in handy in a moment).SPItem Event Receiver has a property called Event Firing Enabled, which simply indicates whether event firing is enabled.We may never know about all of the dangers lurking out there, but today we’re going to cover at least one danger you may encounter while writing event receivers – an annoying issue with the Item Updating and Item Updated events firing twice.I should also point out that I know the difference between a metaphor and simile in case that was bothering you from the opening sentence.
Perhaps this is why the Document ID feature fails to remove the content types that it adds. I’ve got an event handler on a Share Point list that’s fairly long running, and this then raised a question in the office – do these settings control event firing for the currently running event handler, or for the entire list? You can do this through an SPWeb (site) scoped feature, declaratively or programmatically with an SPEvent Receiver Definition.Unfortunately, you can’t declaratively register event receivers at the SPSite (Site collection) level – which would be fantastic – just turn on the feature and across all your site collection lists/libraries of a give type would get additional event receivers.Personally, I think this may be a bug; I don’t see why this shouldn’t work at the SPSite level.We can turn this off to prevent our loop from occuring.First, we declare a boolean to hold the original value of the Event Firing Enabled property.