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POMemoryCache does not work after several minutes
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copied!<p>Here is my code:</p> <pre><code>public class ConfigCache { private static volatile ObjectCache _cache = MemoryCache.Default; private const string KeyModule = "MODULE_XDOC_KEY"; private static string _settingFile; public ConfigCache(string file) { _settingFile = file; } public XDocument Get() { var doc = _cache[KeyModule] as XDocument; if (doc == null) { doc = XDocument.Load(_settingFile); var policy = new CacheItemPolicy(); var filePaths = new List<string> {_settingFile}; policy.ChangeMonitors.Add(new HostFileChangeMonitor(filePaths)); var callback = new CacheEntryRemovedCallback(this.MyCachedItemRemovedCallback); policy.RemovedCallback = callback; _cache.Set(KeyModule, doc, policy); } return _cache[KeyModule] as XDocument; } private void MyCachedItemRemovedCallback(CacheEntryRemovedArguments arguments) { // Log these values from arguments list } } </code></pre> <p>When run into _cache.Set() first time, it works fine:</p> <ul> <li>_cache.Set() works well, it add the xdoc into cache.</li> </ul> <p>But after several minutes(1 or 2 minutes), cache will not work anymore:</p> <ul> <li>_cache.Set() does not insert anything into cache</li> <li>_cache.Set() does not report any error.</li> <li>the callback MyCachedItemRemovedCallback never triggered.</li> </ul> <p>Someone met same issue: <a href="https://stackoverflow.com/questions/10254708/memorycache-always-returns-null-after-first-expiration">MemoryCache always returns "null" after first expiration</a></p> <p>But it seems not resolved yet. Anyone have any idea on this?</p>

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