using ConfectioneryListImplement.Models; namespace ConfectioneryListImplement { public class DataListSingleton { private static DataListSingleton? _instance; public List<Component> Components { get; set; } public List<Order> Orders { get; set; } public List<Pastry> Pastry { get; set; } public List<Client> Clients { get; set; } private DataListSingleton() { Components = new List<Component>(); Orders = new List<Order>(); Pastry = new List<Pastry>(); Clients = new List<Client>(); } public static DataListSingleton GetInstance() { if (_instance == null) { _instance = new DataListSingleton(); } return _instance; } } }