2.0 KiB
ActivationService & ActivationHandlers
ActivationService
The ActivationService is in charge of handling the application's initialization and activation.
The method ActivateAsync() is the entry point for the application lifecycle event OnLaunched.
ActivationHandlers
The ActivationService has a collection of ActivationHandlers, that are registered in the property IEnumerable<IActivationHandler> _activationHandlers.
Each class in the application that can handle activation derives from the abstract class ActivationHandler<T> (T is the type of ActivationEventArguments the class can handle) and implements the method HandleInternalAsync().
The method HandleInternalAsync() is where the actual activation takes place.
The virtual method CanHandleInternal() checks if the incoming activation arguments are of the type the ActivationHandler can manage. It can be overwritten to establish further conditions based on the ActivationEventArguments.
ActivateAsync
InitializeAsync
InitializeAsync contains services initialization for services that are going to be used as ActivationHandler. This method is called before the window is activated. Only code that needs to be executed before app activation should be placed here, as the splash screen is shown while this code is executed.
StartupAsync
StartupAsync contains initializations of other classes that do not need to happen before app activation and starts processes that will be run after the Window is activated.
HandleActivationAsync
The HandleActivationAsync method gets the first ActivationHandler that can handle the arguments of the current activation. It execute the ActivationHandler<LaunchActivatedEventArgs> _defaultHandler if no other ActivationHandler is selected or the selected ActivationHandler does not result in Navigation.