async void OnPrintTaskSourceRequestedHandler(PrintTaskSourceRequestedArgs args)
{
var deferral = args.GetDeferral();
await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
() =>
{
this.document = new PrintDocument();
this.document.Paginate += OnPaginate;
this.document.GetPreviewPage += OnGetPreviewPage;
this.document.AddPages += OnAddPages;
// Tell the caller about it.
args.SetSource(this.document.DocumentSource);
});
deferral.Complete();
}
private void OnPrintTaskSourceRequested(PrintTaskSourceRequestedArgs args)
{
args.SetSource(_documentSource);
}