Although Sitefinity CMS provides many events raised by the built-in modules, you can also create your custom events providing hooks to your code. In order to implement a custom event, you need to follow 3 steps.
All events provide an interface specifying the contract for the event. The interface has all properties that will be passed to the event handler as data. You should implement a custom interface for your event and include any properties you want. All interfaces should implement the IEvent interface.
When you raise the event, you will need to create an instance which will be passed to the handler. Since you cannot create interface instances, you will need a class which implements the interface.
Whenever you want to invoke the event handlers which have subscribed to your event, you should raise it. This can be done using a helper method of the EventHub class.
After you've done this, everyone will be able to subscribe to your event using the ICustomEvent interface. For more information on subscribing, read For developers: Work with events.
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