TempData fails silently without sessions middleware

[alex-novikov-1990]

Following action results in empty response:

[HttpGet]
public async Task<IActionResult> Index()
{
    TempData["test"] = "test";

    return View(await messageBus.Query(new FindUsers()));
}

[kichalla]

What version of MVC package are you using? I am able to repro what you are seeing...if you had enabled logging(ex: console, debug or eventlog) you should be seeing a detail like below

System.InvalidOperationException: Session has not been configured for this application or request.
   at Microsoft.AspNet.Http.Internal.DefaultHttpContext.get_Session()
   at Microsoft.AspNet.Mvc.SessionStateTempDataProvider.SaveTempData(HttpContext context, IDictionary`2 values)
   at Microsoft.AspNet.Mvc.TempDataDictionary.Save()
   at Microsoft.AspNet.Mvc.SaveTempDataFilter.OnResourceExecuted(ResourceExecutedContext context)
   at Microsoft.AspNet.Mvc.Core.FilterActionInvoker.<InvokeResourceFilterAsync>d__46.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNet.Mvc.Core.FilterActionInvoker.<InvokeAsync>d__41.MoveNext()

[alex-novikov-1990]

I'm using beta6 and I didn't see this detail. Problem can be easily reproduced in VS2015 ASP.NET Web Application template by adding TempData to Index action of HomeController.

[danroth27]

This should probably result in a 500. Today you get a 200.