ProjectLib/ProjectLibrary/Repositores/Implementations/OrderRepository.cs

using ProjectLibrary.Entites;
using ProjectLibrary.Entities;
using ProjectLibrary.Repositories;
using System.Collections.Generic;
using System.Linq;

namespace ProjectLibrary.Repositories.Implementations
{
    public class OrderRepository : IOrderRepository
    {
        private readonly List<Orders> _orders = new List<Orders>();

        public void CreateOrder(Orders order)
        {
            _orders.Add(order);
        }

        public void DeleteOrder(int id)
        {
            var order = _orders.FirstOrDefault(o => o.Id == id);
            if (order != null)
            {
                _orders.Remove(order);
            }
        }

        public Orders ReadOrderById(int id)
        {
            return _orders.FirstOrDefault(o => o.Id == id) ?? Orders.CreateEntity(id, 0, 0, 0);
        }

        public IEnumerable<Orders> ReadOrders()
        {
            return _orders;
        }

        public void UpdateOrder(Orders order)
        {
            var existingOrder = _orders.FirstOrDefault(o => o.Id == order.Id);
            if (existingOrder != null)
            {
                _orders.Remove(existingOrder);
                _orders.Add(order);
            }
        }
    }
}