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To change the events that the remote event receiver handles, open Solution Explorer, open the Properties window for the remote event receiver, expand the Share Point Events node, and then set only the events that you want to handle to True.
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.
The add-in is visible in multiple websites in the tenancy, but the event does not run separately for each of these. After four timeouts, Share Point rolls back the entire add-in installation.
The full implications of these facts are discussed in Include rollback logic and "already done" logic in your add-in event handlers. Removal of an add-in only moves the add-in to the user's recycle bin.
Second, a user must remove the add-in from the second stage recycle bin.
This last task triggers the App Uninstalling event.
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 URL of the RER service is registered for the events it handles.
When we try to add new item in "Software" list in Item Adding event we can see: Where "18" is an Id of category.There are three add-in events as described in the next sections.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).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.For example, the event type (from one of the two tables earlier in this article) is identified, so that your code can branch to the logic that is appropriate for the event.