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ItemAdding This means that an item is about to be added ItemAttachmentAdding This means that a file attachment is being added ItemAttachmentAdded This means that a file attachment has been added ItemAttachmentDeleting This means that a file attachment is about to be deleted ItemAttachmentDeleted This means that a file attachment has been deleted ItemCheckingIn This means that an item is about to be checked in ItemCheckedIn This means that an item is checked in ItemCheckingOut This means that an item is about to be checked out ItemCheckedOut This means that an item is checked out ItemDeleting This means that an item is about to be deleted ItemDeleted This means that an item has been deleted ItemFileMoving This means that a file is about to move ItemFileMoved This means that a file move is complete ItemFileTransformed This means that a file exists but cannot be overridden; actual use of this is not documented ItemUncheckingOut This means that an item is about to be unchecked out ItemUncheckedOut This means that an item has been unchecked out ItemUpdating This means that the item is about to be updated ItemUpdated This means that an item has been updated Within an Event Receiver, you can expose any or all of the events you need, based on the way they fire and, of course, what you want to do Since you have complete access (in most cases) to what caused the event, you also can make decisions like Only react to the event if the list name is X or Only update the status if the status in another list is set The basic event firing pattern is shown in Table 19-1 As you can see, the naming of the methods matches the way that they fire, although you have to watch out for those that fire additional events (such as an Add with an Attachment) One thing to be aware of is how Event Receivers are executed within SharePoint While invoked by an event, you are running alongside the SharePoint process, and you re not part of it like a web part is This means that your logic is based on background functionality, and you cannot interact with the User Interface, prompt users for information, and so on Also, you don t have a web context like you do in a web part; you must use the Properties object in order to determine things such as the site you are running in Basically, it s like a standalone application that simply uses SharePoint to start it up There is a gotcha in using Event Receivers, in that events can fire more than once even though only one action occurred In fact, I ve seen the ItemAdded event fire ten (10) times in a row! The ItemUpdated event also fires twice regularly This is not documented at Microsoft, so I can t tell you if this looping is the intended behavior or not; even with the updates available, this still remains undocumented Regardless, it means you have to accommodate for this in your logic For example, to update a field from Approved to Completed within the ItemUpdate method, you would need to add a check of the status first to ensure that you do not do a double update
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Event Receiver Method Firing Order ItemAdding ItemAdded ItemAdding For each attachment: ItemAttachmentAdding ItemAttachmentAdded ItemAdded ItemAdding ItemAdded ItemUpdating ItemUpdated ItemAdding Item Added ItemUpdating ItemUpdated ItemUpdating For each attachment: ItemAttachmentAdding ItemAttachmentAdded ItemUpdated ItemUpdating For each attachment: ItemAttachmentDeleting ItemAttachmentDeleted ItemUpdated ItemDeleting ItemDeleted ItemUpdating ItemUpdated ItemCheckingIn ItemUpdated ItemCheckedIn ItemAdding ItemUpdating ItemAdded ItemUpdating ItemUpdated ItemDeleting ItemDeleted
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