Free no register adult cam to cam - Spitemeventreceiver itemupdating example
I don’t mean that it’s largest and most luxurious application every written, but rather that you may be cruising headlong into a nasty rendezvous with an iceberg that could deal a severe blow to your project.
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.
SPItem Event Receiver has a property called Event Firing Enabled, which simply indicates whether event firing is enabled.
With that in mind, Share Point 2010 is like a sea of icebergs – there is a lot going on under the surface that you may not notice until it’s too late.
Unfortunately, that makes your project like the Titanic.
Note: Allegedly, this does change if the event receiver is synchronous – the before properties are available. Obviously, for Share Point 2007 systems that doesn’t apply – as ‘*ed’ event receivers are always asynchronous. Are people worried about events not being handled ‘cos firing is disabled, or is this just a convenient way of tracking whether events are enabled or not?
Share Point allows you to attach event receivers to content types. Unfortunately, deleting event receivers from those content types is much more hard. Continue reading In Share Point, Event Handlers (or Event Receivers – whichever terminology, a child of SPItem Event Receiver) can be registered against lists/libraries.
Personally, I think this may be a bug; I don’t see why this shouldn’t work at the SPSite level.
Anyway, there is still another option – we could register our event against a particular Content Type.
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.
In this Item Updated event, we are simply assigning the current List Item to a new SPList Item object, changing its "Title" property, and updating it. However, this simple piece of code will cause an endless loop, as each time you call list Item. As you can see, we need a way to prevent this loop from occuring.
Luckily there is an easy and elegant solution with a little custom code.
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