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Asked: 2026-05-11T18:36:40+00:00

I would like to ask is there any way to achieve this functionality: I

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I would like to ask is there any way to achieve this functionality:

I have an Ajax enabled user web site (tree view on the left side, and content on the right side). When users selects a node on the left side, I need to store the last selected node in database. However the user can change the node quite often (even 5 or 10 times a minute).

So I would like to add it to the application cache, like:

cache["userName"]=selectedNodeID;

Is there any caching framework that would: perform certain action on a cache item if it wasn’t changed for let’s say 5 minutes? It would allow me to store last selected node id after 5 minutes from last change. If the user changes the node before this time passes – I would just update cache value and reset timer.

Any hints?

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1 Answer

  1. Editorial Team

    You could use the callback mechanism for when the cache item is removed from the cache. If you set the cache duration to 5 minutes, then you could check in your callback method whether the item has already been saved – if it hasn’t then you can push it to the database. In either case, you can put the item straight back in the cache for another 5 minutes.

    e.g. you would have something like this as the last parameter of your Cache.Insert method:

    new CacheItemRemovedCallback (SaveItemToDatabaseAndReturnItToTheCache)

    and then you would implement the callback method accordingly.

    more info here: http://weblogs.asp.net/kwarren/archive/2004/05/20/136129.aspx

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