public async Task <AsyncVoidMethodBuilder> LoadLocalDataAsync() { if (App.first) { AllGroups = new ObservableCollection <QuoteGroup>(); _quoteList = new HashSet <QuoteItem>(); return(AsyncVoidMethodBuilder.Create()); } QuoteItem[] list = null; try { list = await ObjectPersister.Load <QuoteItem[]>("data_quotes", ObjectPersisterLocation.Local); } catch (Exception e) { Log("LoadLocalDataAsync", e.Message); ThinkDataSource.statusLoad = ThinkDataSource.XMLCorruptedError; list = null; } finally { // lock (_lockerQuoteList) { if (list == null) { _quoteList = new HashSet <QuoteItem>(); } else { _quoteList = new HashSet <QuoteItem>(list); } AllGroups = new ObservableCollection <QuoteGroup>(); MountGroups(); } } return(AsyncVoidMethodBuilder.Create()); }