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To create a SharePoint Foundation event handler in Visual Studio, create a new project of type “class library” and then inherit from one of the event receiver base classes.
How to handle remote events in SharePoint add in?
The web service contains a code file to handle the remote events. After you create the remote event receiver, you add code to the code file for the web application service to handle the events.
There are two kinds of events: Before events are triggered before the SharePoint infrastructure does any of its own handling of the event (including committing changes to the content database). In SharePoint custom before event handlers always execute synchronously. Among other purposes, they can be used to cancel the event.
How does an appinstalled handler work in SharePoint?
Your AppInstalled handler can write varying values to the property bag, based on, say, the site type of the host web (such as Team Site or Blog site). Checking to see if the host web is an AppCatalog site is a good way to detect whether the add-in has been installed with tenant scope.
To handle list and list item events, you create remote event receivers (RERs), which are web services that run externally to the SharePoint farm or SharePoint Online. The URL of the RER service is registered for the events it handles.
When to use remote after event handler in SharePoint?
In SharePoint, remote after event handlers, for list and list item events, always execute asynchronously. (App events are an exception.) Among other purposes, they can be used to log events.
The AppInstalled event runs immediately after SharePoint has finished everything that it needs to do when the add-in is installed, but before the user is notified that installation is complete. Although this is an after event, SharePoint runs your handler synchronously.