result.cs

public async Task<Option<OrderViewModel>> Handle(GetOrderDetails request, CancellationToken cancellationToken)
{
    var order = await _orderRepository.GetByIdAsync(request.OrderId, cancellationToken);

    if (order == null)
    {
        return Option.None<OrderViewModel>();
    }

    var result = new OrderViewModel
    {
        OrderDate = order.OrderDate,
        OrderItems = order.OrderItems.Select(oi => new OrderItemViewModel
        {
            PictureUrl = oi.ItemOrdered.PictureUri,
            ProductId = oi.ItemOrdered.CatalogItemId,
            ProductName = oi.ItemOrdered.ProductName,
            UnitPrice = oi.UnitPrice,
            Units = oi.Units
        }).ToList(),
        OrderNumber = order.Id,
        ShippingAddress = order.ShipToAddress,
        Total = order.Total()
    };

    return result.Some();
}