MaintenanceTrigger 类

定义

命名空间:

Windows.ApplicationModel.Background

表示维护触发器。

public ref class MaintenanceTrigger 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.IMaintenanceTriggerFactory, 65536, "Windows.Foundation.UniversalApiContract")]
class MaintenanceTrigger 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.IMaintenanceTriggerFactory), 65536, "Windows.Foundation.UniversalApiContract")]
public sealed class MaintenanceTrigger

function MaintenanceTrigger(freshnessTime, oneShot)

Public NotInheritable Class MaintenanceTrigger

继承

Object Platform::Object IInspectable MaintenanceTrigger

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

以下示例演示如何创建和注册维护触发器。

//
// 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 every 15 minutes as long as the device is plugged in to AC power.
//
MaintenanceTrigger trigger = new MaintenanceTrigger(15, false);

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

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

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

注解

仅当系统连接到交流电源时，使用维护触发器的后台任务才会运行。

注意

此类不敏捷，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，请参阅线程和封送处理 (C++/CX) 和使用多线程环境中的Windows 运行时对象 (.NET) 。

构造函数

MaintenanceTrigger(UInt32, Boolean)

初始化维护触发器的新实例。

属性

FreshnessTime	获取维护触发器的间隔。
OneShot	获取维护触发器是仅使用一次还是每次 FreshnessTime 间隔使用。