Fired event itemupdating which wasn t handled

The URL of the RER service is registered for the events it handles.There are two ways to register a handler: The field update events are about changing the properties of a field (column) on a list, such as whether it is sortable, not about changing the data in the field.

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Because your service sends a cancel message to Share Point, the add-in is not removed from the recycle bin.

If it is restored from there and used again, it may fail to work without that database entry.

However, your App Uninstalling handler completes If Share Point doesn't receive a results message from your handler in 30 seconds, it calls the handler again.

It gives up entirely and rolls back the event after three retries (four tries in all).

Your add-in can handle the following list item events.

When a registered event occurs, Share Point calls the appropriate method in your service and passes an object that provides some context information for your code.Workflows cannot be triggered by add-in events, so add-in events cannot be handled with a Share Point-hosted add-in.To handle list and list item events, you create remote event receivers (RERs), which are web services that run externally to the Share Point farm or Share Point Online.The App Upgraded event runs immediately after Share Point has finished everything that it needs to do when the add-in is updated to a new version, but before the user is notified that updating is complete.Like the App Installed event, it is an after event, but is essentially synchronous, and it is a best practice to catch errors and notify Share Point to roll back the update.Add-in events are also handled by remote web services, but they are configured differently in the add-in package from list and list item RERs, so they are treated as a separate category of component.

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