Navigation menu with highlight in Asp.NET MVC?

Question

It\'s a simple question. How did stackoverflow do their menu in Asp.net MVC, with highlight on what page we are on.

Answer 1

1.First create extention

public class Extention
{
    public static Dictionary GetDictionary()
    {
        Dictionary urls = new Dictionary();
        urls.Add(new Menu { Controller = "AppHome", Action = "Index" }, new Menu { Controller = "AppHome", Action = "Index" });
        urls.Add(new Menu { Controller = "Home", Action = "Index" }, new Menu { Controller = "Home", Action = "Index" });

        return urls;
    }
}
public static class HtmlExtensions
{
    public static MvcHtmlString ActionMenu(this HtmlHelper helper,String linkText,string actionName,String controllerName)
    {
        var tag= new TagBuilder("li");
        if(helper.ViewContext.RequestContext.IsCurrentRoute(null,controllerName,actionName)||
            helper.ViewContext.RequestContext.IsParentRoute(controllerName,actionName))
        {
            tag.AddCssClass("active");
        }
        else
        {
            tag.AddCssClass("inactive");
        }
        tag.InnerHtml = helper.ActionLink(linkText, actionName, controllerName).ToString();
        return MvcHtmlString.Create(tag.ToString());
    }
}
public static class RequestExtentions
{
    public static bool IsCurrentRoute(this RequestContext context, String areaName)
    {
        return context.IsCurrentRoute(areaName, null, null);
    }
    public static bool IsCurrentRoute(this RequestContext context, String areaName, String controllerName)
    {
        return context.IsCurrentRoute(areaName, controllerName, null);
    }
    public static bool IsCurrentRoute(this RequestContext context, String areaName, String controllerName, params String[] actionNames)
    {
        var routeData = context.RouteData;
        var routeArea = routeData.DataTokens["area"] as String;
        var current = false;

        if (((String.IsNullOrEmpty(routeArea) && String.IsNullOrEmpty(areaName)) || (routeArea == areaName)) &&
             ((String.IsNullOrEmpty(controllerName)) || (routeData.GetRequiredString("controller") == controllerName)) &&
             ((actionNames == null) || actionNames.Contains(routeData.GetRequiredString("action"))))
        {
            current = true;
        }
        return current;
    }
    public static bool IsParentRoute(this RequestContext context, String controller, String action)
    {
        var routeData = context.RouteData;
        Menu returnUrl = null;
        Menu requestUrl = new Menu { Action = routeData.GetRequiredString("action"), Controller = routeData.GetRequiredString("controller") };
        Menu linkUrl = new Menu { Action = action, Controller = controller };

        var urls = Extention.GetDictionary();
        urls.TryGetValue(requestUrl, out returnUrl);

        if (returnUrl != null && returnUrl.Equals(linkUrl))
            return true;
        else
            return false; ;
    }
}