MVC 6 中的 HtmlHelpers

我正在尝试将此代码移植到 mvc 6，感谢任何帮助，代码可以编译，但该方法在我的观点中不可用@Html.IsActive.

using Microsoft.AspNet.Mvc.Rendering;

namespace Blah.Web.Helpers
{
    public static class HtmlHelpers
    {

        public static string IsActive(this HtmlHelper htmlHelper, string controller, string action)
        {
            var routeData = htmlHelper.ViewContext.RouteData;

            var routeAction = routeData.Values["action"].ToString();
            var routeController = routeData.Values["controller"].ToString();

            var returnActive = (controller == routeController && action == routeAction);

            return returnActive ? "active" : "";
        }

    }
}

在视图中，我引用了名称空间：

@using Blah.Web.Helpers;

在方法签名中，HtmlHelper应该IHtmlHelper

请参阅下面的示例

namespace Blah.Web.Helpers
{
    public static class HtmlHelpers
    {
        public static string IsActive(this IHtmlHelper htmlHelper, string controller, string action)
        {
            var routeData = htmlHelper.ViewContext.RouteData;

            var routeAction = routeData.Values["action"].ToString();
            var routeController = routeData.Values["controller"].ToString();

            return (controller == routeController && action == routeAction) ? "active" : "";
        }
    }
}