FileUpdateRequestDeferral Class

Definition

Namespace:

Windows.Storage.Provider

Use to complete an update asynchronously.

public ref class FileUpdateRequestDeferral sealed

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
class FileUpdateRequestDeferral final

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
public sealed class FileUpdateRequestDeferral

Public NotInheritable Class FileUpdateRequestDeferral

Inheritance

Object Platform::Object IInspectable FileUpdateRequestDeferral

Attributes

ContractVersionAttribute

Windows requirements

Device family	Windows 10 (introduced in 10.0.10240.0 - for Xbox, see UWP features that aren't yet supported on Xbox)
API contract	Windows.Foundation.UniversalApiContract (introduced in v1.0)

Examples

The File picker contracts sample demonstrates how to respond to a FileUpdateRequested event, including how to get a deferral.

// Event handler
void CachedFileUpdaterUI_FileUpdateRequested(CachedFileUpdaterUI sender, FileUpdateRequestedEventArgs args)
{
    fileUpdateRequest = args.Request;
    fileUpdateRequestDeferral = fileUpdateRequest.GetDeferral();
    switch (cachedFileUpdaterUI.UIStatus)
    {
        case UIStatus.Hidden:
            fileUpdateRequest.Status = FileUpdateStatus.UserInputNeeded;
            fileUpdateRequestDeferral.Complete();
            break;
        case UIStatus.Visible:
            break;
        case UIStatus.Unavailable:
            fileUpdateRequest.Status = FileUpdateStatus.Failed;
            fileUpdateRequestDeferral.Complete();
            break;
    }
}

// Register for the event
cachedFileUpdaterUI.FileUpdateRequested += CachedFileUpdaterUI_FileUpdateRequested;

args contains a FileUpdateRequestedEventArgs object.

Remarks

If your app participates in the Cached File Updater contract, and you can't finish responding to the update before returning from your FileUpdateRequested event handler, call the FileUpdaterRequestDeferral.Complete method to complete the update asynchronously.

Note

The file picker UI is disabled until the app has finished responding to all FileUpdateRequested events that were fired.

To learn about responding to a FileUpdateRequested event, see FileUpdateRequestedEventArgs.

Methods

Complete()

Signals that the response to a FileUpdateRequested event is finished.