获取控制器和操作的完全限定URL？

public class HomeController : Controller
{
    public IActionResult Index()
    {
        var urlHelper = new UrlHelper(this.ControllerContext);
        var url = urlHelper.Action("About", "Home", new { id = 1 }, this.Request.Scheme, this.Request.Host.Value);
        return Content(url);
    }

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

public class HomeController : Controller
{
    private readonly IUrlHelper _urlHelper;

    public HomeController(IUrlHelper urlHelper)
    {
        _urlHelper = urlHelper;
    }

    public IActionResult Index()
    {
        var url = _urlHelper.Action("About", "Home", new { id = 1 }, this.Request.Scheme, this.Request.Host.Value);
        return Content(url);
    }

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