MVC Helpers for generating links or sections with toggleable css classes (e.g. for highlighting). #mvc

ListItemSection.cs

public class ListItemSection : DivSection
{
    public ListItemSection(HtmlHelper self, string className = null)
        : base(self, className, "li")
    {
    }
}

MvcDivSection.cs

public class DivSection : IDisposable
{
    protected HtmlHelper helper;
    protected string element;

    public DivSection()
    {
    }

    public DivSection(HtmlHelper helper, string className = null, string element = "div")
    {
        this.helper = helper;
        this.element = element;
        helper.ViewContext.Writer.Write(GetStart(className));
    }

    public void Dispose()
    {
        helper.ViewContext.Writer.Write(GetEnd());
    }

    private string GetStart(string className)
    {
        var sb = new StringBuilder();
        sb.AppendFormat("<{0} ", element);

        if (!string.IsNullOrWhiteSpace(className))
            sb.AppendFormat("class=\"{0}\"", className);

        sb.Append(" />");
        return sb.ToString();
    }

    private string GetEnd()
    {
        return string.Format("</{0}>", element);
    }
}

MvcHelpers.cs

public static class MvcHelpers
{
    public static MvcHtmlString MenuLink(this HtmlHelper helper, string text, string action, string controller, string cssClass = "currentMenuItem")
    {
        if (IsActionMatch(helper, action, controller))
            return helper.ActionLink(text, action, controller, null, new { @class = cssClass });

        return helper.ActionLink(text, action, controller);
    }


    public static ListItemSection ActiveListItemSection(this HtmlHelper self, string action, string controller, string className)
    {
        if (IsActionMatch(self, action, controller))
            return new ListItemSection(self, className);

        return new ListItemSection(self);
    }

    private static bool IsActionMatch(HtmlHelper helper, string action, string controller)
    {
        var routeData = helper.ViewContext.RouteData.Values;
        var currentController = routeData["controller"] as string;
        var currentAction = routeData["action"] as string;

        bool actionMatch = action.Equals(currentAction, StringComparison.OrdinalIgnoreCase) &&
                           controller.Equals(currentController, StringComparison.OrdinalIgnoreCase);
        return actionMatch;
    }
}