SystemCondition 类

定义

命名空间:

Windows.ApplicationModel.Background

表示后台任务运行必须有效的系统条件。

public ref class SystemCondition 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.ISystemConditionFactory, 65536, "Windows.Foundation.UniversalApiContract")]
class SystemCondition 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.ISystemConditionFactory), 65536, "Windows.Foundation.UniversalApiContract")]
public sealed class SystemCondition

function SystemCondition(conditionType)

Public NotInheritable Class SystemCondition

继承

Object Platform::Object IInspectable SystemCondition

属性

ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

实现

IBackgroundCondition

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

以下示例通过向后台任务添加条件来扩展 SystemTrigger 中显示的示例。

//
// 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);

//
// A system condition indicating that the background task shouldn't run until the user is present.
//
SystemCondition condition = new SystemCondition(SystemConditionType.UserPresent)

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

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

//
// 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

SystemCondition(SystemConditionType)

初始化系统条件的新实例。

属性

ConditionType

获取系统条件的条件类型。