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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.The most common set of receivers used, however, are part of SPItem Event Receiver which let you wire your code up to a number of events that can occur to items on a list or library.
These can apply to Feature events such as Feature Activated, List events such as Field Added, and many others.
The wording is curious here, so I thought I’d take some time to test each combination of common events such as Add, Update and Delete.
These were done across a custom list and then a document library.
To understand why this is happening, let’s first look at what happens when the user adds a document to the library when the Require Check Out option is disabled: So the net result of this is that the document is uploaded and the Item Adding and Item Added events have fired, which is pretty much what you would expect.
Next, let’s look at what happens when the user adds a document when the Require Check Out option is enabled.