EF 7 - Context returns null although values are there - entity-framework

Question

I have a CQRS setup and I am trying to use domain events.
After I receive a command for a new order, I am adding the newly created Order object to the dbcontext.
public async Task<Guid> Handle(CreateOrderCommand message, CancellationToken cancellationToken)
{
...
var order = new Order(...);
...
order.SubmitOrder();
_orderRepository.Add(order);
await _orderRepository.UnitOfWork
.SaveEntitiesAsync(cancellationToken);
return order.Id;
}
The order.SubmitOrder() method is as follows
public void SubmitOrder()
{
AddDomainEvent(new OrderPlacedDomainEvent(Guid.NewGuid(), Id));
}
and orderRepository.UnitOfWork.SaveEntitiesAsync(cancellationToken); is on overload to the UnitOfWork.SaveEntitiesAsync() as follows:
public async Task<bool> SaveEntitiesAsync(CancellationToken cancellationToken = default)
{
// Dispatch Domain Events collection.
// Choices:
// A) Right BEFORE committing data (EF SaveChanges) into the DB will make a single transaction including
// side effects from the domain event handlers which are using the same DbContext with "InstancePerLifetimeScope" or "scoped" lifetime
// B) Right AFTER committing data (EF SaveChanges) into the DB will make multiple transactions.
// You will need to handle eventual consistency and compensatory actions in case of failures in any of the Handlers.
if (_mediator != null)
{
await _mediator.DispatchDomainEventsAsync(this);
}
// After executing this line all the changes (from the Command Handler and Domain Event Handlers)
// performed through the DbContext will be committed
await base.SaveChangesAsync(cancellationToken);
return true;
}
Note that the changes are not saved before the events are dispatched and the handler is called.
Now in the event handler when I am trying to get the order object from the context:
await _context.Orders.Include(o => o.OrderItems).SingleOrDefaultAsync(o => o.Id == id, cancellationToken: cancellationToken);
it returns null although the data is available in the context under _context.ChangeTracker.DebugView.LongView
Is there any way to get the order data here?

Answer 1

Well, solution found:
If Find/FindAsyncis used instead of SingleOrDefaultAsync it will return the values available in the change tracker.
public async Task<Order?> FindAsync(Guid id, CancellationToken cancellationToken = default)
=> await _context.Orders.FindAsync(new object[] { id }, cancellationToken: cancellationToken);