.NET Core Web Application - Combining attribute routes

SampleController.cs

[Route("[controller]/[action]")]
public class SampleController : Controller
{
    [Route("~/")]                // "/" 
    [Route("/Sample")]           // "/Sample"
    [Route("~/Sample/Index")]    // "/Sample/Index"
    [Route("Demo")]              // "/Sample/Index/Demo"
    public ActionResult Index()
    {
        return View();
    }

    // "/Sample/Abount"
    public ActionResult About()
    {
        return View();
    }
}