如何从UrlHelper获取字符串操作和控制器名称

public ActionResult Index()
{
    string controllerName = this.ControllerContext.RouteData.Values["controller"].ToString();
    return View();
}

public ActionResult Index()
{
    string actionName = this.ControllerContext.RouteData.Values["action"].ToString();
    return View();
}

public ActionResult Index()
{
    Uri requestUrl = Request.Url;
    string urlString = requestUrl.ToString();
    return View();
}

public ActionResult Index()
{
    NameValueCollection queryParams = Request.QueryString;
    string param1 = queryParams["param1"];
    string param2 = queryParams["param2"];
    return View();
}