How to keep using ModelState with RedirectToAction in ASP.NET MVC 6?

I have a method to remove the object. Removal does not own view, and is a "Delete" button in the "EditReport". Upon successful removal of a redirect on "Report".

[HttpPost]
[Route("{reportId:int}")]
[ValidateAntiForgeryToken]
public IActionResult DeleteReport(int reportId)
{
    var success = _reportService.DeleteReportControl(reportId);
    if (success == false)
    {
        ModelState.AddModelError("Error", "Messages");
        return RedirectToAction("EditReport");
    }
    ModelState.AddModelError("OK", "Messages");
    return RedirectToAction("Report");
}

In ASP.NET MVC 5 I use the following attributes to save ModelState between methods. I took from here: https://stackoverflow.com/a/12024227/3878213

public class SetTempDataModelStateAttribute : ActionFilterAttribute
{
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        base.OnActionExecuted(filterContext);         
        filterContext.Controller.TempData["ModelState"] = 
           filterContext.Controller.ViewData.ModelState;
    }
}

public class RestoreModelStateFromTempDataAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        base.OnActionExecuting(filterContext);
        if (filterContext.Controller.TempData.ContainsKey("ModelState"))
        {
            filterContext.Controller.ViewData.ModelState.Merge(
                (ModelStateDictionary)filterContext.Controller.TempData["ModelState"]);
        }
    }
}

But in ASP.NET MVC 6 RC 1 (ASP.NET Core 1.0), this code does not work.

Error in filterContext.Controller does not contain definitions for TempData and ViewData.