C:/Private/OSS/n2cms/github/n2cms/src/Framework/Extensions/Web/Mvc/RouteExtensions.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Routing;
using N2.Persistence;
using System.Web;
using System.Web.Mvc;
using System.Linq.Expressions;

namespace N2.Web.Mvc
{
        public static class RouteExtensions
        {
                public static RouteData ApplyCurrentItem(this RouteData data, string controllerName, string actionName, ContentItem page, ContentItem part)
                {
                        data.Values[ContentRoute.ControllerKey] = controllerName;
                        data.Values[ContentRoute.ActionKey] = actionName;

                        return data.ApplyContentItem(ContentRoute.ContentPageKey, page)
                                .ApplyContentItem(ContentRoute.ContentPartKey, part);
                }

                internal static RouteData ApplyContentItem(this RouteData data, string key, ContentItem item)
                {
                        if (data == null) throw new ArgumentNullException("data");
                        if (key == null) throw new ArgumentNullException("key");

                        if (item != null)
                        {
                                data.DataTokens[key] = item;
                                data.Values[key] = item.ID;
                        }

                        return data;
                }

                public static ContentItem CurrentItem(this RouteData routeData)
                {
                        return routeData.DataTokens.CurrentItem(ContentRoute.ContentPartKey)
                                ?? routeData.DataTokens.CurrentItem(ContentRoute.ContentPageKey);
                }

                public static ContentItem CurrentPage(this RouteData routeData)
                {
                        return routeData.DataTokens.CurrentItem(ContentRoute.ContentPageKey);
                }

                internal static ContentItem CurrentItem(this RouteValueDictionary data, string key)
                {
                        if (data.ContainsKey(key))
                                return data[key] as ContentItem;
                        return null;
                }

                public static T CurrentItem<T>(this RouteValueDictionary data, string key, IPersister persister)
                        where T: ContentItem
                {
                        if (data.ContainsKey(key))
                        {
                                object value = data[key];
                                if (value == null)
                                        return null;
                                
                                var item = value as T;
                                if (item != null)
                                        return item as T;

                                if(value is int)
                                        return persister.Get((int)value) as T;

                                int itemId;
                                if (value is string && int.TryParse(value as string, out itemId))
                                        return persister.Get((int)value) as T;
                        }

                        return null;
                }
        }
}