Jaa

SystemTrigger Class

  • Reference

Definition

Namespace:
Windows.ApplicationModel.Background
Edit

Represents a system event that triggers a background task to run.

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
Inheritance
Object Platform::Object IInspectable SystemTrigger
Attributes
ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute
Implements
IBackgroundTrigger

Windows requirements

Device family
Windows 10 (introduced in 10.0.10240.0)
API contract
Windows.Foundation.UniversalApiContract (introduced in v1.0)

Examples

The following example shows how to create and register a system trigger with the TimeZoneChanged event.

//
// 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();

Remarks

Note

This class is not agile, which means that you need to consider its threading model and marshaling behavior. For more info, see Threading and Marshaling (C++/CX) and Using Windows Runtime objects in a multithreaded environment (.NET).

Constructors

SystemTrigger(SystemTriggerType, Boolean)

Initializes a new instance of a system event trigger.

Properties

OneShot

Gets whether a system event trigger will be used only once.
TriggerType

Gets the system event type of a system event trigger.

Applies to

See also