private void ExecLoadCatalogFromServiceCmd(object parameter) { ClearSectionsContent(); ThreadPool.QueueUserWorkItem(_ => { SetLoadingState(true); var source = new WcfClient(ConnectionSettings.Address, ConnectionSettings.Port); try { var books = source.GetBooks(); if (books == null) { MessageBox.Show(loc.CouldNotConnectToService, loc.Error, MessageBoxButton.OK); SetLoadingState(false); return; } if (books.Any()) { DistributeBooksToSections(books); } } catch { //toDo: сделать вывод сообщения об ошибке } finally { SetLoadingState(false); } }); }