C#CreateOrderCommand.cs
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using MediatR;
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namespace Application.Orders.Commands;
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public record CreateOrderCommand(
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    Guid CustomerId,
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    List<OrderLineItem> Items
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) : IRequest<Guid>;
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public record OrderLineItem(Guid ProductId, int Quantity, decimal UnitPrice);
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public class CreateOrderCommandHandler : IRequestHandler<CreateOrderCommand, Guid>
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{
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    private readonly IOrderRepository _orderRepo;
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    public CreateOrderCommandHandler(IOrderRepository orderRepo)
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    {
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        _orderRepo = orderRepo;
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    }
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    public async Task<Guid> Handle(CreateOrderCommand request, CancellationToken cancellationToken)
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    {
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        var total = request.Items.Sum(i => i.Quantity * i.UnitPrice);
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        var order = Order.Create(request.CustomerId, request.Items, total);
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        await _orderRepo.AddAsync(order, cancellationToken);
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        await _orderRepo.SaveChangesAsync(cancellationToken);
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        return order.Id;
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    }
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}
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