public static UserDataService GetInstance() { if (instance == null) { instance = new UserDataService(); } return(instance); }
//用户登录状态 public void UserLogOn() { //用户登录 isUser = true; isSupplier = false; isLogOn = false; //清空购物车菜品 UserDataService.GetInstance()._current.SampleItems.Clear(); SampleOrderVisible = Visibility.Visible; ShoppingCartVisible = Visibility.Visible; LogOnVisible = Visibility.Collapsed; OrderViewVisible = Visibility.Collapsed; ManagementVisible = Visibility.Collapsed; }