Dynamic sitemap in ASP.NET MVC

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
public class MVCUrlAttribute : ActionFilterAttribute
{
    public string Url { get; private set; }

    public MVCUrlAttribute(string url)
    {
        this.Url = url;
    }

    public override void OnResultExecuting(ResultExecutingContext filterContext)
    {
        // Put this 'canonical url' into the model (which feeds the view)
        // to help search engines with issues of duplicate content
        filterContext.Controller.ViewData["CanonicalUrl"] = url;
        base.OnResultExecuting(filterContext);
    }
}


   // Find all the MVC Routes
    Log.Debug("*** FINDING ALL MVC ROUTES MARKED FOR INCLUSION IN SITEMAP");
    var allControllers = Assembly.GetExecutingAssembly().GetTypes().Where(t => t.IsSubclassOf(typeof(Controller)));
    Log.DebugFormat("Found {0} controllers", allControllers.Count());

    foreach (var controllerType in allControllers)
    {
        var allPublicMethodsOnController = controllerType.GetMethods(BindingFlags.Public | BindingFlags.Instance);
        Log.DebugFormat("Found {0} public methods on {1}", allPublicMethodsOnController.Count(), controllerType.Name);

        foreach (var publicMethod in allPublicMethodsOnController)
        {
            var mvcurlattr = publicMethod.GetCustomAttributes(true).OfType<MVCUrlAttribute>().FirstOrDefault();
            if (mvcurlattr != null)
            {
                string url = mvcurlattr.Url;
                Log.Debug("Found " + controllerType.Name + "." + publicMethod.Name + " <-- " + url);
                Global.SiteMapUrls.Add(url);  //<-- your code here using url
            }
        }
    }

 

 

 

    protected string GetUrl(object routeValues)
    {
        RouteValueDictionary values = new RouteValueDictionary(routeValues);
        RequestContext context = new RequestContext(HttpContext, RouteData);

        string url = RouteTable.Routes.GetVirtualPath(context, values).VirtualPath;

        return new Uri(Request.Url, url).AbsoluteUri;
    }

        List<string> urlList = new List<string>();
    urlList.Add(GetUrl(new { controller = "Help", action = "Edit" }));
    urlList.Add(GetUrl(new { controller = "Help", action = "Create" }));
    urlList.Add(GetUrl(new { controller = "About", action = "Company" }));
    urlList.Add(GetUrl(new { controller = "About", action = "Management" }));