.NET 4 ObjectCache - Can We Hook Into a “Cache Expired” Event?

Question

I\'ve got a simple object being cached like this:

_myCache.Add(someKey, someObj, policy);

Where _myCache is declared as Obje

Answer 1

This is my way to use CacheRemovedCallback event when cache expired.

I share for whom concern.

public static void SetObjectToCache(string cacheItemName, T obj, long expireTime)
        {
            ObjectCache cache = MemoryCache.Default;

            var cachedObject = (T)cache[cacheItemName];

            if (cachedObject != null)
            {
                // remove it
                cache.Remove(cacheItemName);
            }

            CacheItemPolicy policy = new CacheItemPolicy()
            {
                AbsoluteExpiration = DateTimeOffset.Now.AddMilliseconds(expireTime),
                RemovedCallback = new CacheEntryRemovedCallback(CacheRemovedCallback)
            };

            cachedObject = obj;
            cache.Set(cacheItemName, cachedObject, policy);
        }

public static void CacheRemovedCallback(CacheEntryRemovedArguments arguments)
            {
                var configServerIpAddress = Thread.CurrentPrincipal.ConfigurationServerIpAddress();
                long configId = Thread.CurrentPrincipal.ConfigurationId();
                int userId = Thread.CurrentPrincipal.UserId();
                var tagInfoService = new TagInfoService();
                string returnCode = string.Empty;

                if (arguments.CacheItem.Key.Contains("DatatableTags_"))
                {
                    // do what's needed
                    Task.Run(() =>
                    {
                    });
                }

            }