EventHandlers.ISystemEventHandler<TModel, TEvent> Interface
System event handler abstract class. Event handlers implement this class, and are added to the dependency injection services collection with a call to AddTransient
||The type of the data item which the event is for. This can be any type and is the object type which is passed to the Invoke method.
The type of the event. This can be any class. The TEvent class is used to couple the subscription and
ISystemEventHandler implementation to a specific type of event. The TEvent type does not require any particular
implementation, it is used as a marker.
Invoke (<TModel> item)
Raise an event