public DiscountViewModel()
        {
            Dishes.Clear();
            Dishes.AddItems(_unitOfWork.Dishes.GetAll());

            ApplyAction = new Command(OnApplyActionExecute, OnApplyActionCanExecute);
        }
 private void RefreshDishesCollection()
 {
     Dishes.Clear();
     Dishes.AddItems(_unitOfWork.Dishes.GetAll());
     new ActionsHelper().CalculateDiscountsExisting(Dishes);
 }