1:  using System;
   2:  using System.Linq;
   3:  using System.Text;
   4:  using System.Web.Mvc;
   5:  using System.Web.Mvc.Html;
   6:  using System.Web.Routing;
   7:   
   8:  namespace MvcSamples.Html
   9:  {
  10:      public static class UrlExtensions
  11:      {
  12:          public static bool IsCurrent(this UrlHelper urlHelper, String areaName)
  13:          {
  14:              return urlHelper.IsCurrent(areaName, null, null);
  15:          }
  16:   
  17:          public static bool IsCurrent(this UrlHelper urlHelper, String areaName, String controllerName)
  18:          {
  19:              return urlHelper.IsCurrent(areaName, controllerName, null);
  20:          }
  21:   
  22:          public static bool IsCurrent(this UrlHelper urlHelper, String areaName, String controllerName, params String[] actionNames)
  23:          {
  24:              return urlHelper.RequestContext.IsCurrentRoute(areaName, controllerName, actionNames);
  25:          }
  26:   
  27:          public static string Selected(this UrlHelper urlHelper, String areaName)
  28:          {
  29:              return urlHelper.Selected(areaName, null, null);
  30:          }
  31:   
  32:          public static string Selected(this UrlHelper urlHelper, String areaName, String controllerName)
  33:          {
  34:              return urlHelper.Selected(areaName, controllerName, null);
  35:          }
  36:   
  37:          public static string Selected(this UrlHelper urlHelper, String areaName, String controllerName, params String[] actionNames)
  38:          {
  39:              return urlHelper.IsCurrent(areaName, controllerName, actionNames) ? "selected" : String.Empty;
  40:          }
  41:      }
  42:   
  43:      public static class HtmlExtensions
  44:      {
  45:          public static MvcHtmlString ActionMenuItem(this HtmlHelper htmlHelper, String linkText, String actionName, String controllerName)
  46:          {
  47:              var tag = new TagBuilder("li");
  48:   
  49:              if ( htmlHelper.ViewContext.RequestContext.IsCurrentRoute(null, controllerName, actionName) )
  50:              {
  51:                  tag.AddCssClass("selected");
  52:              }
  53:   
  54:              tag.InnerHtml = htmlHelper.ActionLink(linkText, actionName, controllerName).ToString();
  55:   
  56:              return MvcHtmlString.Create(tag.ToString());
  57:          }
  58:      }
  59:   
  60:      public static class RequestExtensions
  61:      {
  62:          public static bool IsCurrentRoute(this RequestContext context, String areaName)
  63:          {
  64:              return context.IsCurrentRoute(areaName, null, null);
  65:          }
  66:   
  67:          public static bool IsCurrentRoute(this RequestContext context, String areaName, String controllerName)
  68:          {
  69:              return context.IsCurrentRoute(areaName, controllerName, null);
  70:          }
  71:   
  72:          public static bool IsCurrentRoute(this RequestContext context, String areaName, String controllerName, params String[] actionNames)
  73:          {
  74:              var routeData = context.RouteData;
  75:              var routeArea = routeData.DataTokens["area"] as String;
  76:              var current = false;
  77:   
  78:              if ( ((String.IsNullOrEmpty(routeArea) && String.IsNullOrEmpty(areaName)) || (routeArea == areaName)) &&
  79:                   ((String.IsNullOrEmpty(controllerName)) || (routeData.GetRequiredString("controller") == controllerName)) &&
  80:                   ((actionNames == null) || actionNames.Contains(routeData.GetRequiredString("action"))) )
  81:              {
  82:                  current = true;
  83:              }
  84:   
  85:              return current;
  86:          }
  87:      }
  88:  }