Try our conversational search powered by Generative AI!

Thomas Krantz
Apr 6, 2012
(0 votes)

Using a bit of System.Runtime.Caching with EPiServer

I have been poking around in System.Runtime.Caching that was introduced with .NET 4, and more specifically the MemoryCache.

The MemoryCache is virtually the same as the good old ASP.NET Cache, except it’s not dependent on System.Web which means you can use it without an HttpContext.

ChangeMonitors monitors changes in the state of data which a cache item depends on, and I’ve written a simple custom ChangeMonitor called PageChangeMonitor to monitor published EPiServer pages.

public class PageChangeMonitor : ChangeMonitor
        private PageReference _pageLink;
        public PageChangeMonitor(PageReference pageLink)
                throw new ArgumentNullException("pageLink");
            bool init = false;
                _pageLink = pageLink;
                DataFactory.Instance.PublishedPage += PublishedPage;
                init = true;
        void PublishedPage(object sender, PageEventArgs e)
            if(e.PageLink.ID  == _pageLink.ID)
        protected override void Dispose(bool disposing)
            DataFactory.Instance.PublishedPage -= PublishedPage;
        public override string UniqueId
            get { return Guid.NewGuid().ToString(); }

The PageChangeMonitor can be used to expire the cache item when a certain page is published. An example:

public string GetSomeDataForPage(PageData page)
           var cacheKey = string.Format("some-data-{0}", page.PageLink.ID);
           var cache = MemoryCache.Default;
           var someData = (string) cache.Get(cacheKey);
           if(someData != null)
               // data was cached
               return someData;
           // data was not in cache. Either it has never been cached,
           // or the PageChangeMonitor expired the cache when the page 
           // was published.
           someData = DoSomeHeavyLiftingAndReturnData(page);
           var policy = new CacheItemPolicy();
           // create the PageChangeMonitor that should monitor the page
           var monitor = new PageChangeMonitor(page.PageLink);
           cache.Add(cacheKey, someData, policy);
           return someData;

Enjoy! And remember – cache is king.

Apr 06, 2012


valdis Apr 11, 2012 04:47 PM

Cool! Is first code snippet complete?

Thomas Krantz
Thomas Krantz Apr 12, 2012 11:44 PM

Not entirely.. missing some using-statements and a finishing } bracket it seems like. But it should work.

Please login to comment.
Latest blogs
Introducing Image Transformer - AI Assistant for Optimizely

We've got something super cool to share with you, and it's all about giving your images a fresh spin. Image Transformer, the latest feature from ou...

Luc Gosso (MVP) | Feb 26, 2024 | Syndicated blog

Welcome 2024 Winter OMVPs

Hello, Optimizely community! We are thrilled to announce and welcome the newest members to the Optimizely Most Valuable Professionals (OMVP) progra...

Patrick Lam | Feb 26, 2024

Optimizely Opal... what it does actually do?

At Opticon 2023, Optimizely announced its first AI product Opal. AI is definitely the new tech buzzword in 2024 and with promises that AI will be...

Jon Jones | Feb 25, 2024 | Syndicated blog

How to add more Content Area Context Menu Item in Optimizely CMS 12

Hey folks, today I will share something related to Context Menu customization in the Content Area of Optimizely CMS. As you know, the content area ...

Binh Nguyen | Feb 25, 2024