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

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

namespace N2.Web.Mvc.Html
{
    public static class ContentItemExtensions
        {
                public static T ResolveService<T>(this HtmlHelper helper) where T : class
                {
                        return helper.ViewContext.RouteData.ResolveService<T>();
                }

                public static T[] ResolveServices<T>(this HtmlHelper helper) where T : class
                {
                        return helper.ViewContext.RouteData.ResolveServices<T>();
                }

        public static ContentItem CurrentPage(this HtmlHelper helper)
        {
            return helper.CurrentPage<ContentItem>();
        }
        public static T CurrentPage<T>(this HtmlHelper helper) where T : ContentItem
        {
            if (helper == null) throw new ArgumentNullException("helper");

            return helper.ViewContext.CurrentPage<T>();
        }

        public static ContentItem CurrentItem(this HtmlHelper helper)
        {
            return helper.CurrentItem<ContentItem>();
        }
        public static T CurrentItem<T>(this HtmlHelper helper) where T : ContentItem
        {
            if (helper == null) throw new ArgumentNullException("helper");

            return helper.ViewContext.CurrentItem<T>();
        }



        public static ContentItem CurrentItem(this ViewContext context)
        {
            return context.CurrentItem<ContentItem>();
        }
        public static T CurrentItem<T>(this ViewContext context) where T : ContentItem
        {
            if (context == null) throw new ArgumentNullException("context");
            
            return context.ViewData.CurrentItem<T>()
                ?? context.RequestContext.CurrentItem<T>();
        }

                public static T CurrentPage<T>(this ViewContext context) where T : ContentItem
                {
                        if (context == null) throw new ArgumentNullException("context");

                        return context.ViewData.CurrentPage<T>()
                                ?? context.RequestContext.CurrentPage<T>();
                }


                private static T CurrentItem<T>(this ViewDataDictionary viewData) where T : ContentItem
                {
                        if (viewData == null) throw new ArgumentNullException("viewData");

                        return viewData.Model as T
                                ?? viewData[ContentRoute.ContentItemKey] as T;
                }
                private static T CurrentPage<T>(this ViewDataDictionary viewData) where T : ContentItem
                {
                        if (viewData == null) throw new ArgumentNullException("viewData");

                        return viewData[ContentRoute.ContentPageKey] as T;
                }
    }
}