Issue in .NET MVC core 2.0

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ASP.NET-Core

Hi

Please ask your help in the following:
I have a ActionFilterAttribute basically to check if session is timed out. I have the following issues:
(1) Unable to get the current context to save the session variables to a table
(2) Unable to inject signmanager so that I can force a Signout of the current user.
(3) Unable to get if the session is still active or not. Currently I am doing a workaround by means of checking for a session variable is Null or not to check for session timeout.

I have been trying a lot using the filtercontext to derive but am unsuccessful. Any pointers in the correct direction will be very helpful.

I am copying the code for your reference

Regards
Santosh

What I have tried:

public override void OnActionExecuting(ActionExecutingContext filterContext)
{

    var sessionVar = filterContext.HttpContext.Session.GetString("sessionVar");
    if (sessionVar == null)
    {

        string s = filterContext.HttpContext.Request.Scheme;

        string redirectTo = "/";
        filterContext.HttpContext.Response.Redirect(redirectTo);
    }
    base.OnActionExecuting(filterContext);
}