AdventureWorks.UILogic.ViewModels.ShoppingCartPageViewModel.DecrementCount C# (CSharp) Метод

        private async Task DecrementCount()
        {
            string errorMessage = string.Empty;

            try
            {
                await _shoppingCartRepository.RemoveProductFromShoppingCartAsync(SelectedItem.ProductId);
                SelectedItem.Quantity -= 1;
                DecrementCountCommand.RaiseCanExecuteChanged();
            }
            catch (Exception ex)
            {
                errorMessage = string.Format(CultureInfo.CurrentCulture, _resourceLoader.GetString("GeneralServiceErrorMessage"), Environment.NewLine, ex.Message);
            }

            if (!string.IsNullOrWhiteSpace(errorMessage))
            {
                await _alertMessageService.ShowAsync(errorMessage, _resourceLoader.GetString("ErrorServiceUnreachable"));
            }
        }