BackgroundTaskDeferral 類別

  • 參考

定義

命名空間:
Windows.ApplicationModel.Background
編輯

表示 IBackgroundTaskInstance.GetDeferral 方法所傳回的背景工作延遲。

public ref class BackgroundTaskDeferral 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)]
class BackgroundTaskDeferral final
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.MTA)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
class BackgroundTaskDeferral 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)]
public sealed class BackgroundTaskDeferral
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.MTA)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
public sealed class BackgroundTaskDeferral
Public NotInheritable Class BackgroundTaskDeferral
繼承
Object Platform::Object IInspectable BackgroundTaskDeferral
屬性
ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

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

下列範例示範如何在非同步程式碼仍在執行時，使用背景工作延遲來延遲工作提前關閉。 請確定您完成所有背景工作延遲。 大部分的背景工作都有逾時，無論是否有任何擱置延遲，應用程式都會暫停或終止。 不過，離開未處理的背景工作延遲會干擾系統及時管理進程存留期的能力。

//
// Declare that your background task's Run method makes asynchronous calls by
// using the async keyword.
//
public async void Run(IBackgroundTaskInstance taskInstance)
{
    //
    // Create the deferral by requesting it from the task instance.
    //
    BackgroundTaskDeferral deferral = taskInstance.GetDeferral();

    //
    // Call asynchronous method(s) using the await keyword.
    //
    var result = await ExampleMethodAsync();

    //
    // Once the asynchronous method(s) are done, close the deferral.
    //
    deferral.Complete();
}

方法

Complete()

通知系統與背景工作相關聯的非同步作業已完成。

適用於