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

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Mvc;
using System.Web.UI;
using System.Web;
using N2.Web.UI;
using System.Security.Principal;
using System.Web.Routing;

namespace N2.Web.Mvc
{
        [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true, AllowMultiple = false)]
        public class ContentOutputCacheAttribute : ActionFilterAttribute
        {
                public override void OnResultExecuting(ResultExecutingContext filterContext)
                {
                        if (filterContext == null)
                                throw new ArgumentNullException("filterContext");

                        if (filterContext.IsChildAction)
                                return;

                        ProcessOutputCache(filterContext.RequestContext);
                }

                private static void ProcessOutputCache(RequestContext requestContext)
                {
                        if (HttpContext.Current == null)
                                return;

                        var user = requestContext.HttpContext.User;
                        if (user == null || user.Identity.IsAuthenticated)
                                return;

                        ICacheManager cacheManager = requestContext.RouteData.ResolveService<ICacheManager>();
                        if (!cacheManager.Enabled)
                                return;

                        var page = new OutputCachedPage(cacheManager.GetOutputCacheParameters());
                        page.ProcessRequest(HttpContext.Current);
                        cacheManager.AddCacheInvalidation(HttpContext.Current.Response);
                }

                private sealed class OutputCachedPage : Page
                {
                        private OutputCacheParameters _cacheSettings;

                        public OutputCachedPage(OutputCacheParameters cacheSettings)
                        {
                                this.ID = Guid.NewGuid().ToString();
                                this._cacheSettings = cacheSettings;
                        }

                        protected override void FrameworkInitialize()
                        {
                                base.FrameworkInitialize();
                                this.InitOutputCache(this._cacheSettings);
                        }
                }
        }
}