Extend LineItems Cart Object Optimizely - Property

gistfile1.txt

[Serializable]
public class CustomLineItem : LineItem
{
    public CustomLineItem() : base() { }

    protected CustomLineItem(SerializationInfo info, StreamingContext context) : base(info, context)
    {
        NewProperty = info.GetString("NewProperty");
    }

    public string NewProperty { get; set; }

    public override void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        base.GetObjectData(info, context);
        info.AddValue("NewProperty", NewProperty);
    }
}

public class CartHelper
{
    private readonly IOrderRepository _orderRepository;

    public CartHelper(IOrderRepository orderRepository)
    {
        _orderRepository = orderRepository;
    }

    public void SaveCart(ICart cart)
    {
        if (cart == null) throw new ArgumentNullException(nameof(cart));

        using (var stream = new MemoryStream())
        {
            var formatter = new BinaryFormatter();
            formatter.Serialize(stream, cart);
            var serializedCart = stream.ToArray();

            // Save serialized cart to persistent storage
            File.WriteAllBytes("cart.dat", serializedCart); // Example using a file
        }
    }

    public ICart LoadCart()
    {
        // Retrieve the serialized cart from persistent storage
        var serializedCart = File.ReadAllBytes("cart.dat"); // Example using a file

        using (var stream = new MemoryStream(serializedCart))
        {
            var formatter = new BinaryFormatter();
            var cart = formatter.Deserialize(stream) as ICart;
            return cart;
        }
    }
}

public class CartService
{
    private readonly IOrderRepository _orderRepository;
    private readonly IOrderGroupFactory _orderGroupFactory;
    private readonly CartHelper _cartHelper;

    public CartService(IOrderRepository orderRepository, IOrderGroupFactory orderGroupFactory)
    {
        _orderRepository = orderRepository;
        _orderGroupFactory = orderGroupFactory;
        _cartHelper = new CartHelper(orderRepository);
    }

    public void AddCustomLineItemToCart()
    {
        var cart = _orderRepository.LoadCart<ICart>(CustomerContext.Current.CurrentContactId, "Default") ?? _orderGroupFactory.CreateCart<CustomerContext.Current.CurrentContactId>("Default");

        var customLineItem = new CustomLineItem
        {
            Code = "TestProduct",
            Quantity = 1,
            NewProperty = "CustomValue"
        };

        cart.GetFirstShipment().LineItems.Add(customLineItem);
        _orderRepository.Save(cart);
    }

    public void ExampleUsage()
    {
        AddCustomLineItemToCart();

        var cart = _orderRepository.LoadCart<ICart>(CustomerContext.Current.CurrentContactId, "Default");
        if (cart != null)
        {
            _cartHelper.SaveCart(cart);
        }

        var loadedCart = _cartHelper.LoadCart() as ICart;
        if (loadedCart != null)
        {
            var customLineItem = loadedCart.GetFirstShipment().LineItems[0] as CustomLineItem;
            if (customLineItem != null)
            {
                string value = customLineItem.NewProperty;
                Console.WriteLine("Custom Line Item Property Value: " + value);
            }
        }
    }
}