private async void ImportSetFromFileAction()
{
FileOpenPicker openPicker = new FileOpenPicker();
openPicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
openPicker.FileTypeFilter.Add(".xlsx");
openPicker.FileTypeFilter.Add(".xls");
openPicker.FileTypeFilter.Add(".docx");
openPicker.FileTypeFilter.Add(".doc");
StorageFile file = await openPicker.PickSingleFileAsync();
if (file != null)
{
try {
CancellationTokenSource cancelSource = new CancellationTokenSource();
Task <ContentDialogResult> loadingScreenTask = new LoadingDialog().ShowAsync().AsTask(cancelSource.Token);
Task <CardSetModel> importingTask = ImportFlashcardService.ImportAddToExistingSet(file, cancelSource.Token, FlashCardSet.Clone());
Task firstToFinish = await Task.WhenAny(loadingScreenTask, importingTask);
cancelSource.Cancel();
if (firstToFinish == importingTask)
{
CardSetModel updatedCardSetModel = await importingTask;
prNavigationService.NavigateTo("EditSetPage");
Messenger.Default.Send(new Tuple <CardSetModel, CardSetModel>(FlashCardSet, updatedCardSetModel), "EditSetView");
}
} catch (Exception ex) {
await new MessageDialog(ex.Message).ShowAsync();
}
}
}
