ISEbd-21_Zinovev_V.V._FurnitureAssembly/FurnitureAssembly/FurnitureAssemblyListImplement/DataListSingleton.cs

using FurnitureAssemblyListImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FurnitureAssemblyListImplement
{
    public class DataListSingleton
    {
        private static DataListSingleton? _instance;
        public List<Workpiece>  Workpieces { get; set; }
        public List<Order> Orders { get; set; }
        public List<Furniture> Furnitures { get; set; }
        public List<Client> Clients { get; set; }

        private DataListSingleton()
        {
            Workpieces = new List<Workpiece>();
            Orders = new List<Order>();
            Furnitures = new List<Furniture>();
            Clients = new List<Client>();
        }

        public static DataListSingleton GetInstance()
        {
            if (_instance == null)
            {
                _instance = new DataListSingleton();
            }
            return _instance;
        }
    }
}