NULL reference exception while reading user sessions (Reflection)

Question

I have implemented the code for reading the active sessions using the reference Reading All Users Session and Get a list of all active sessions in ASP.NET.

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Answer 1

I know this is an old thread, but this may save someone some time. Another thing to check is that obj is of type System.Web.Caching.CacheMultiple. I had this same problem and it was a platform-specific issue as Marc Gravell suggested. It turned out that on the Windows 2003 server, obj was type System.Web.Caching.CacheSingle and there was a null reference exception when trying to get the value for "_caches".

If that is the case, you can still get a list of active sessions with (Hashtable)obj.GetType().GetField("_entries", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(obj);