private void CustomSnowFallFromAppServiceAsync(
IBackgroundTaskInstance instance,
AppServiceTriggerDetails details)
{
var def = instance.GetDeferral();
instance.Canceled += (_, __) => { def.Complete(); };
details.AppServiceConnection.RequestReceived += (_, message) =>
{
var messageDef = message.GetDeferral();
try
{
try
{
// lecture du message
var targetUri = message.Request.Message.FirstOrDefault(kVp => kVp.Key == "targetUri").Value?.ToString();
if (!string.IsNullOrEmpty(targetUri))
{
// Uri locale = pas de téléchargement
if (targetUri.StartsWith("ms-appx"))
{
DispatcherHelper.CheckBeginInvokeOnUIAsync(() => SnowFallAsync(true, new BitmapImage(new Uri(targetUri))));
return;
}
DispatcherHelper.CheckBeginInvokeOnUIAsync(
async() =>
{
// téléchargement local de l'image
var image = await Microsoft.Toolkit.Uwp.UI.ImageCache.GetFromCacheAsync(new Uri(targetUri));
SnowFallAsync(true, image);
});
}
}
finally
{
// fermeture du message
messageDef.Complete();
}
}
finally
{
// On ne fera pas d'autres communications
def.Complete();
}
};
}