HtmlHelpers in MVC 6

Question

I'm trying to port this code over to mvc 6, any help is appreciated, the code compiles but the method is not available in my views on @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" : "";
        }

    }
}

In the View I have the namespace referenced:

@using Blah.Web.Helpers;

Answer 1

In the method signature, HtmlHelper should be IHtmlHelper

See Example below

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" : "";
        }
    }
}