asp.net - deleting cache object at session end

Question

I have a wrapper class for Caching (CachingBL) where I store users that are currently signed in (some of their session info).

In CachingBL wrapper there is actually a dictionary of users, and I am putting that dictionary in cache like this: HttpContext.Current.Cache.Insert(...):

At the session end I would need to access to the cache like this:

var cacheBL = (CacheBL)HttpContext.Current.Cache.Get("MyCache_CacheSlot");

But the problem is that HttpContext.Current is empty, so I cannot access the Cache object. The Cache itself is not empty (tested), but I can't figure out how to access it at Session_End.

Shane Courtrille · Accepted Answer · 2011-06-15 20:20:36Z

3

You can use System.Web.HttpRuntime.Cache to access the cache statically.

answered Jun 15, 2011 at 20:20

Shane Courtrille

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Chris Shaffer · Accepted Answer · 2009-12-21 16:54:56Z

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Instead of putting the whole dictionary in the cache as one cache entry, put each element in the cache as an entry. Then you can give each element a sliding time window of the session timeout time, and let the system handle expiration.

answered Dec 21, 2009 at 16:54

Chris Shaffer

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the berserker Over a year ago

But session and cache entry could expire at different times. I need exactly the same mapping - all the users that are in session need to have the cache entry. At the moment the session expires, user needs to be removed from cache.

Mark Arnott · Accepted Answer · 2009-12-21 17:06:26Z

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Inside the Session_OnEnd event there is no way to get access to the HttpContext.Current because there is no current request.

But you do have access to the session state which includes all session variables. So if you us a session variable to store your token to the key name of the sessions cache slot ("MyCache_CacheSlot" in your example), you will be able to release that cache inside the Session_OnEnd event.

answered Dec 21, 2009 at 17:06

Mark Arnott

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the berserker · Accepted Answer · 2010-01-25 21:56:57Z

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System.Web.SessionState.HttpSessionState is the one I should use instead of HttpContext.Current

answered Jan 25, 2010 at 21:56

the berserker

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Shane Courtrille Over a year ago

HttpSessionState provides access to the session. Not the Cache so you haven't actually answered your own question.

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