async void QuerySubmitted(object sender, AutoSuggestEditQuerySubmittedEventArgs e)
{
if (source != null)
{
source.Cancel();
}
source = new CancellationTokenSource();
var token = source.Token;
try {
autoSuggestEdit.ItemsSource = await GetItems(e.Text, token);
}
catch (OperationCanceledException) { }
}
void QuerySubmitted(object sender, AutoSuggestEditQuerySubmittedEventArgs e)
{
AssignFilter(autoSuggestEdit, e.Text);
}
