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1public sealed record CreateOrderCommand(2    Guid CustomerId,3    IReadOnlyList<OrderLineDto> Lines4);56public sealed class CreateOrderHandler(7    IOrderRepository orders,8    IUnitOfWork uow9) : IRequestHandler<CreateOrderCommand, Guid>10{11    public async Task<Guid> Handle(12        CreateOrderCommand cmd,13        CancellationToken ct)14    {15        var order = Order.Create(cmd.CustomerId, cmd.Lines16            .Select(l => new OrderLine(l.ProductId, l.Qty, l.UnitPrice)));1718        await orders.AddAsync(order, ct);19        await uow.CommitAsync(ct);20        return order.Id;21    }22}