List all active ASP.NET Sessions

Question

How can I list (and iterate through) all current ASP.NET sessions?

Answer 1

It does not seems right that there is not any class or method that provides this information. I think, it is a nice to have feature for SessionStateStoreProvider, to have a method which returns current active session, so that we don't have to actively track session life in session_start and session_end as mention by Jan Remunda.

Since I could not find any out of box method to get all session list, And I did not wanted to track session life as mentioned by Jan, I end up with this solution, which worked in my case.

public static IEnumerable GetActiveSessions()
{
    object obj = typeof(HttpRuntime).GetProperty("CacheInternal", BindingFlags.NonPublic | BindingFlags.Static).GetValue(null, null);
    object[] obj2 = (object[])obj.GetType().GetField("_caches", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(obj);

    for (int i = 0; i < obj2.Length; i++)
    {
        Hashtable c2 = (Hashtable)obj2[i].GetType().GetField("_entries", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(obj2[i]);
        foreach (DictionaryEntry entry in c2)
        {
            object o1 = entry.Value.GetType().GetProperty("Value", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(entry.Value, null);
            if (o1.GetType().ToString() == "System.Web.SessionState.InProcSessionState")
            {
                SessionStateItemCollection sess = (SessionStateItemCollection)o1.GetType().GetField("_sessionItems", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(o1);
                if (sess != null)
                {
                    yield return sess;
                }
            }
        }
    }
}