Using session in MVC controller returns error

Question

I'm trying to use Session but the normally way i do its not working.

[HttpPost]
[Route("FiltroSiltDet")]
public HttpResponseMessage FiltroSiltDet(string DT_INCLUSAO)
{
    try
    {
        HttpSessionState Session = HttpContext.Current.Session;
        Session["DT_INCLUSAO"] = "test";
        Session["DT_INCLUSAO"] = DT_INCLUSAO;
        List<AcompanhamentoSiltDetDTO> retorno = new List<AcompanhamentoSiltDetDTO>();

        using (AcompanhamentoSiltBLL oBLL = new AcompanhamentoSiltBLL())
        {

            retorno = oBLL.AcompanhamentoSiltTransacaoDet(DT_INCLUSAO);
        }
        var resp = Request.CreateResponse<List<AcompanhamentoSiltDetDTO>>(HttpStatusCode.OK, retorno);
        return resp;

    }
    catch (Exception ex)
    {
        throw new Exception(ex.Message);
    }
}

I always used session this way and its not working now.
When it try to pass value to the session I get this error.

Object reference not set to an instance of an object

Someone know what why its not working.

I'm using a MVC application, I Always used this session method in web Forms I'm new in Asp.Net MVC.

Show the exact error message and line where it happens. Also are you sure you want to throw a new exception like that? — Sami Kuhmonen, Mar 31 '17 at 17:35
I get the error "Object reference not set to an instance of an object" when it try to pass value to the session in "Session["DT_INCLUSAO"] = "test" — Vinicius Cano, Mar 31 '17 at 17:49
Are you sure that you enable session? Calls like `AddSession` and `UseSession` in `Startup`? — Dmytro Bogatov, Mar 31 '17 at 19:51
Yes,still not working, the controllers is inside a API, i'm almost sure that's why doesn't work. — Vinicius Cano, Mar 31 '17 at 19:59
Follow this http://stackoverflow.com/a/11479021/1365663, I hope it will help you. — Jignesh Variya, Apr 03 '17 at 06:49
@ViniciusCano what does `does not work mean`? In what scenario are you calling the action? how was the service configured? Provide a [mcve] that can be used to reproduce the problem. Not much help can be provided otherwise. — Nkosi, Apr 04 '17 at 03:07

score 0 · Answer 1 · answered Jul 27 '19 at 06:02

I used Session in my MVC application controller by adding SessionState attribute to controller class, Please try this...

Add [SessionState(SessionStateBehavior.Required)] attribute to your class

now this should work

Session["DT_INCLUSAO"] = "test";

Session["DT_INCLUSAO"] = DT_INCLUSAO;

Using session in MVC controller returns error

1 Answers1