Sharepoint 2016 itemupdating afterproperties

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How can we prevent a user from changing a certain column for an item in a list event?From the list table, you can see if we hook into the Item Updating event, we can compare the current item’s value (properties. 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.Original value means that the correct original value was available.So, if we go back to our original problem listed above.Unfortunately, that makes your project like the Titanic.

Changed value means that the correct updated value was available.You can think of an item event receiver like a database trigger: it has different events that fire during the course of Share Point running an operation on a list item (or document item).Item Event Receivers derive from the SPItem Event Receiver class and have a number of methods that can be overridden to respond to various events: As you look through this list, you should notice that events have two types of endings: WARNING: One major gotcha you should know about the SPItem Event Receiver class is that while you can implement multiple list item event handlers in a single class, Share Point instantiates a new instance of that class for each individual event it needs to handle.As many of you know, event receivers are a great way to hook into various Share Point events.These can apply to Feature events such as Feature Activated, List events such as Field Added, and many others.

This is because you have two classes – one that is handling the Item Updating event and in which the instance level variable is set, and one that is handling the Item Updated event in which the instance level variable is not set.

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