public Controller(
     IClientsHelper clientsHelper   = null,
     IProductsHelper productsHelper = null,
     IOrdersHelper ordersHelper     = null,
     IMainsHelper mainsHelper       = null)
 {
     _clientsHelper  = clientsHelper ?? new ClientsHelper();
     _productsHelper = productsHelper ?? new ProductsHelper();
     _ordersHelper   = ordersHelper ?? new OrdersHelper();
     _mainsHelper    = mainsHelper ?? new MainsHelper();
 }
 public ProductsController(
     DataContext context,
     IImageHelper imageHelper,
     IConverterHelper converterHelper,
     IProductsHelper productsHelper,
     IUserHelper userHelper)
 {
     _context         = context;
     _imageHelper     = imageHelper;
     _converterHelper = converterHelper;
     _productsHelper  = productsHelper;
     _userHelper      = userHelper;
 }