SystemCondition 類別

  • 參考

定義

命名空間:
Windows.ApplicationModel.Background
編輯

表示必須生效的系統條件，背景工作才能執行。

public ref class SystemCondition sealed
/// [Windows.Foundation.Metadata.Activatable(Windows.ApplicationModel.Background.ISystemConditionFactory, 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 SystemCondition 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.ISystemConditionFactory, 65536, "Windows.Foundation.UniversalApiContract")]
class SystemCondition final
[Windows.Foundation.Metadata.Activatable(typeof(Windows.ApplicationModel.Background.ISystemConditionFactory), 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 SystemCondition
[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
繼承
Object Platform::Object IInspectable SystemCondition
屬性
ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute
實作
IBackgroundCondition

Windows 需求

裝置系列
Windows 10 (已於 10.0.10240.0 引進)
API contract
Windows.Foundation.UniversalApiContract (已於 v1.0 引進)

範例

下列範例會展開 SystemTrigger 中顯示的範例，方法是將條件新增至背景工作。

//
// 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();

備註

注意

這個類別不是敏捷式的，這表示您需要考慮其執行緒模型和封送處理行為。 如需詳細資訊，請參閱執行緒和封送處理 (C++/CX) 和在多執行緒環境中使用 Windows 執行階段 物件 (.NET) 。

建構函式

SystemCondition(SystemConditionType)

初始化系統條件的新實例。

屬性

ConditionType

取得系統條件的條件類型。

適用於