SystemTrigger Classe

  • Referência

Definição

Namespace:
Windows.ApplicationModel.Background
Editar

Representa um evento do sistema que dispara uma tarefa em segundo plano a ser executada.

public ref class SystemTrigger sealed
/// [Windows.Foundation.Metadata.Activatable(Windows.ApplicationModel.Background.ISystemTriggerFactory, 65536, Windows.Foundation.UniversalApiContract)]
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Standard)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.MTA)]
class SystemTrigger final
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Standard)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.MTA)]
/// [Windows.Foundation.Metadata.Activatable(Windows.ApplicationModel.Background.ISystemTriggerFactory, 65536, "Windows.Foundation.UniversalApiContract")]
class SystemTrigger final
[Windows.Foundation.Metadata.Activatable(typeof(Windows.ApplicationModel.Background.ISystemTriggerFactory), 65536, typeof(Windows.Foundation.UniversalApiContract))]
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Standard)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.MTA)]
public sealed class SystemTrigger
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Standard)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.MTA)]
[Windows.Foundation.Metadata.Activatable(typeof(Windows.ApplicationModel.Background.ISystemTriggerFactory), 65536, "Windows.Foundation.UniversalApiContract")]
public sealed class SystemTrigger
function SystemTrigger(triggerType, oneShot)
Public NotInheritable Class SystemTrigger
Herança
Object Platform::Object IInspectable SystemTrigger
Atributos
ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute
Implementações
IBackgroundTrigger

Requisitos do Windows

Família de dispositivos
Windows 10 (introduzida na 10.0.10240.0)
API contract
Windows.Foundation.UniversalApiContract (introduzida na v1.0)

Exemplos

O exemplo a seguir mostra como criar e registrar um gatilho do sistema com o evento TimeZoneChanged .

//
// A friendly task name.
//
String name = "ExampleTaskName";

//
// Must be the same entry point that is specified in the manifest.
//
String taskEntryPoint = "ExampleNamespace.ExampleTaskName";

//
// A system trigger that goes off whenever the time zone is changed, or a change occurs with daylight savings time.
//
IBackgroundTrigger trigger = new SystemTrigger(SystemTriggerType.TimeZoneChange, false);

//
// Builds the background task.
//
BackgroundTaskBuilder builder = new BackgroundTaskBuilder();

builder.Name = name;
builder.TaskEntryPoint = taskEntryPoint;
builder.SetTrigger(trigger);

//
// Registers the background task, and get back a BackgroundTaskRegistration object representing the registered task.
//
BackgroundTaskRegistration task = builder.Register();

Comentários

Observação

Essa classe não é ágil, o que significa que você precisa considerar seu modelo de threading e comportamento de marshaling. Para obter mais informações, consulte Threading and Marshaling (C++/CX) e Using Windows Runtime objects in a multithreaded environment (.NET).

Construtores

SystemTrigger(SystemTriggerType, Boolean)

Inicializa uma nova instância de um gatilho de evento do sistema.

Propriedades

OneShot

Obtém se um gatilho de evento do sistema será usado apenas uma vez.
TriggerType

Obtém o tipo de evento do sistema de um gatilho de evento do sistema.

Aplica-se a

Confira também