DataProviderRequest.GetDeferral Method
Definition
Important
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Returns a DataProviderDeferral object.
public:
virtual DataProviderDeferral ^ GetDeferral() = GetDeferral;
DataProviderDeferral GetDeferral();
public DataProviderDeferral GetDeferral();
function getDeferral()
Public Function GetDeferral () As DataProviderDeferral
Returns
An data provider deferral object.
Examples
async void OnDeferredImageRequestedHandler(DataProviderRequest request)
{
// Provide updated bitmap data using delayed rendering.
if (this.imageStream != null)
{
DataProviderDeferral deferral = request.GetDeferral();
InMemoryRandomAccessStream inMemoryStream = new InMemoryRandomAccessStream();
// Decode the image.
BitmapDecoder imageDecoder = await BitmapDecoder.CreateAsync(this.imageStream);
// Re-encode the image at 50% width and height.
BitmapEncoder imageEncoder = await BitmapEncoder.CreateForTranscodingAsync(inMemoryStream, imageDecoder);
imageEncoder.BitmapTransform.ScaledWidth = (uint)(imageDecoder.OrientedPixelHeight * 0.5);
imageEncoder.BitmapTransform.ScaledHeight = (uint)(imageDecoder.OrientedPixelHeight * 0.5);
await imageEncoder.FlushAsync();
request.SetData(RandomAccessStreamReference.CreateFromStream(inMemoryStream));
deferral.Complete();
}
}
Remarks
To learn more, check out How to produce requested data asynchronously.
Applies to
Opinia
https://aka.ms/ContentUserFeedback.
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