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Each time it calls the handler, your code starts again from the beginning.But you generally don't want your handler to redo things it has already done, such as create a list on the host web, and you can't know if your rollback logic was completed, or even triggered, before the handler timed out.Here's what your handler usually has to do: Note The preceding points apply to the App Uninstalling event as much as to the other two add-in events.For example, if your handler for the uninstalling event deletes a row in a remote database, and then encounters an error, the row needs to be restored.The App Installed event runs immediately after Share Point has finished everything that it needs to do when the add-in is installed, but before the user is notified that installation is complete. The add-in is not available for use until after your handler has completed, and your handler can cancel the installation (which causes Share Point to roll back everything it has done as part of the installation).In fact, it is a best practice to catch any errors in your handler and instruct Share Point to roll back the installation.

First, a user must remove the add-in from the recycle bin, which moves it to the second stage recycle bin.

The App Uninstalling event is synchronous and you can use it to cancel the uninstallation, which would leave the add-in in the second stage recycle bin.

The main purpose of a handler for this event is to delete or recycle things that were deployed with an App Installed (or an App Updated) handler.

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.

Some examples of what a handler for this event can do: For detailed instructions about creating add-in event handlers, see Create an add-in event receiver in Share Point Add-ins.

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