Httpselfhost Serialize daughter entities + Session nhibernate

Question

I have the following method:

    // GET: api/Pedido/5
    [ResponseType(typeof(Orcamento))]
    public IHttpActionResult Get(int id)
    {
        using (OrcamentoRepository or = new OrcamentoRepository())
        {
            var orcamento = or.PesquisarPedidoAbertoPorNumeroComanda(null, id);
            //var teste = JsonConvert.SerializeObject(orcamento, Parametros.JsonConfig.JsonSerializerSettings);

            return Ok(orcamento);
        }
    }

and the following configuration:

    public static JsonSerializerSettings JsonSerializerSettings = new JsonSerializerSettings()
    {
        Formatting = Formatting.Indented, 
        ReferenceLoopHandling = ReferenceLoopHandling.Ignore, 
        PreserveReferencesHandling = PreserveReferencesHandling.All, 
        ContractResolver = new DefaultContractResolver()
        {
            IgnoreSerializableAttribute = true 
        }
    };

The normal call for this method does not return the object, because the Session closes in the Return even before serializing the object...

But if I remove the comment in the Jsonconvert.Serializeobject() line, I simply serialize for a test variable that will not be used, the method will return normally. (at that time he carries the daughter lists that are set up as Lazyload in nhibernate)

I wonder if there are any settings that I can change to close the using’s Session only after serializing and sending, or I’ll have to do the conversion manually and send the json in string format.

I implemented the Repository standard in Apicontroller, it is functional but I do not know if it is correct to do this

public class ApiControllerRepository<R> : ApiController
{
    protected R Repositorio;

    public ApiControllerRepository()
    {
        Repositorio = Activator.CreateInstance<R>();
    }

    protected override void Dispose(bool disposing)
    {
        ((IDisposable)Repositorio).Dispose();
        base.Dispose(disposing);
    }
}