private async Task UpdateSourceAsync()
{
_gifPresenter?.StopAnimation();
_initializationCancellationTokenSource?.Cancel();
GifImage.Source = null;
_gifPresenter = null;
if (UriSource != null)
{
var uriSource = UriSource;
var cancellationTokenSource = new CancellationTokenSource();
_initializationCancellationTokenSource = cancellationTokenSource;
try
{
var streamReference = RandomAccessStreamReference.CreateFromUri(uriSource);
var inMemoryStream = new InMemoryRandomAccessStream();
using (inMemoryStream)
{
var readStream = await streamReference.OpenReadAsync().AsTask(cancellationTokenSource.Token);
if (readStream.ContentType.ToLowerInvariant() != "image/gif")
{
throw new ArgumentException("Unsupported content type: " + readStream.ContentType);
}
var copyAction = RandomAccessStream.CopyAndCloseAsync(
readStream.GetInputStreamAt(0L),
inMemoryStream.GetOutputStreamAt(0L)
);
await copyAction.AsTask(cancellationTokenSource.Token);
if (uriSource.Equals(UriSource))
{
var gifPresenter = new GifPresenter();
GifImage.Source = await gifPresenter.InitializeAsync(inMemoryStream);
_gifPresenter = gifPresenter;
if (_isLoaded)
{
_gifPresenter.StartAnimation();
}
}
}
}
catch (TaskCanceledException)
{
// Just keep the empty image source.
}
catch (FileNotFoundException)
{
// Just keep the empty image source.
}
}
}
private async Task UpdateSourceAsync()
{
_gifPresenter?.StopAnimation();
_initializationCancellationTokenSource?.Cancel();
GifImage.Source = null;
_gifPresenter = null;
if (UriSource != null)
{
var uriSource = UriSource;
var cancellationTokenSource = new CancellationTokenSource();
_initializationCancellationTokenSource = cancellationTokenSource;
try
{
var streamReference = RandomAccessStreamReference.CreateFromUri(uriSource);
var inMemoryStream = new InMemoryRandomAccessStream();
using (inMemoryStream)
{
var readStream = await streamReference.OpenReadAsync().AsTask(cancellationTokenSource.Token);
if (readStream.ContentType.ToLowerInvariant() != "image/gif")
{
GifImage.Source = new BitmapImage(uriSource);
inMemoryStream.FlushAsync();
inMemoryStream.Dispose();
return;
//throw new ArgumentException("Unsupported content type: " + readStream.ContentType);
}
var copyAction = RandomAccessStream.CopyAndCloseAsync(
readStream.GetInputStreamAt(0L),
inMemoryStream.GetOutputStreamAt(0L)
);
await copyAction.AsTask(cancellationTokenSource.Token);
if (uriSource.Equals(UriSource))
{
var gifPresenter = new GifPresenter();
GifImage.Source = await gifPresenter.InitializeAsync(inMemoryStream);
_gifPresenter = gifPresenter;
if (_isLoaded)
{
_gifPresenter.StartAnimation();
}
}
}
}
catch (ArgumentException ex)
{
//GifImage.Source = new BitmapImage(uriSource);
}
catch (TaskCanceledException)
{
// Just keep the empty image source.
}
catch (FileNotFoundException)
{
// Just keep the empty image source.
}
}
}
