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

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

            try
            {
                _shoppingCart = await _shoppingCartRepository.GetShoppingCartAsync();

                if (_shoppingCart != null && _shoppingCart.ShoppingCartItems != null)
                {
                    ShoppingCartItemViewModels = new ObservableCollection<ShoppingCartItemViewModel>();
                    foreach (var item in _shoppingCart.ShoppingCartItems)
                    {
                        var shoppingCartItemViewModel = new ShoppingCartItemViewModel(item, _resourceLoader);
                        shoppingCartItemViewModel.PropertyChanged += ShoppingCartItemViewModel_PropertyChanged;
                        ShoppingCartItemViewModels.Add(shoppingCartItemViewModel);
                    }

                    CheckoutCommand.RaiseCanExecuteChanged();
                    OnPropertyChanged("FullPrice");
                    OnPropertyChanged("TotalDiscount");
                    OnPropertyChanged("TotalPrice");
                }
            }
            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"));
            }
        }