SystemTrigger 类

定义

命名空间:

Windows.ApplicationModel.Background

表示触发后台任务运行的系统事件。

public ref class SystemTrigger sealed

/// [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.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

继承

Object Platform::Object IInspectable SystemTrigger

属性

ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

实现

IBackgroundTrigger

Windows 要求

设备系列	Windows 10 (在 10.0.10240.0 中引入)
API contract	Windows.Foundation.UniversalApiContract (在 v1.0 中引入)

示例

以下示例演示如何使用 TimeZoneChanged 事件创建和注册系统触发器。

//
// 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();

注解

注意

此类不是敏捷类，这意味着需要考虑其线程模型和封送处理行为。 有关详细信息，请参阅线程处理和封送处理 (C++/CX) 和在多线程环境中使用 Windows 运行时 对象 (.NET) 。

构造函数

SystemTrigger(SystemTriggerType, Boolean)

初始化系统事件触发器的新实例。

属性

OneShot	获取系统事件触发器是否只使用一次。
TriggerType	获取系统事件触发器的系统事件类型。

另请参阅

• 通信阻止和筛选示例 (Windows 10)