EFB/Controllers/HomeController.cs

using EFB.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using System.Diagnostics;
using Microsoft.AspNetCore.Http;
using EFB.Sessions;

namespace EFB.Controllers
{
    public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;

        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
        }

        public IActionResult Index()
        {
            //Ensure that the user is not already logged in
            UserModel user = HttpContext.Session.GetObject<UserModel>("User");
            if (user != null) return RedirectToAction("Index", "App");

            return View();
        }

        public IActionResult Privacy()
        {
            return View();
        }

        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }
}