I'm using Umbraco.Core.CacheHelper to save a list of news. Getting and inserting the items is no problem, but clearing the items on updates is however causing some problems for me.

The code is fired in an ApplicationEventHandler on Contentservice.Published, and the code looks like this:

                    cache.RuntimeCache.InsertCacheItem("newsList", () => null); //Isn't cleared
                    cache.RuntimeCache.InsertCacheItem("newsList_date", () => null);  //Isn't cleared
                    cache.RuntimeCache.InsertCacheItem("newsListCache", () => null);  //Isn't cleared
                    cache.RuntimeCache.InsertCacheItem("newsListCacheTime", () => null); //Isn't cleared

                    cache.RuntimeCache.ClearCacheItem("newsList"); //Isn't cleared
                    cache.RuntimeCache.ClearCacheItem("newsList_date"); //Isn't cleared
                    cache.RuntimeCache.ClearCacheItem("newsListCache"); //Isn't cleared
                    cache.RuntimeCache.ClearCacheItem("newsListCacheTime"); //Isn't cleared

I've tried to use both ClearCacheItem and InsertCacheItem with a null value - none of them works. The only thing that seems to work is to wait the 6 hours I've set as expire time