EventHandlers.ISingletonSystemEventHandler<TModel, TEvent> Interface
Namespace: Nucleus.Abstractions.EventHandlers
Assembly: Nucleus.Abstractions.dll
System event handler abstract class. Event handlers implement this class, and are added to the dependency injection services collection with a call to AddTransient.
Type Parameters
| TModel | 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. |
| TEvent | 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. |
Remarks
Use this interface to create a singleton event handler, which cannot receive scoped parameters in its constructor. Singleton system event handlers are used when an event is raised in a scheduled task, or in other cases where there isn't a current HttpContext. Implementations of ISingletonSystemEventHandler handle a single model type and event type represented by TEvent and TModel.