Invalidating a cache object in ASP.NET

Question

I am maintaining an application in which the developer has used data caching in the following manner:

HttpContext.Current.Cache["key"] = myDataSet;

He hasn't specified when this cache gets invalidated. The myDataSet is a result of a SELECT from the database. The database was updated, but the cache is not invalidated. I do not want to change the source code. I simply want to invalidate it. I tried iisreset with no luck.

Chris Ballance · Accepted Answer · 2009-09-01 15:16:37Z

3

If you re-save the web.config, the app pool will recycle more gracefully than an iisreset, with the same result for the cache.

edited Sep 1, 2009 at 15:16

answered Sep 1, 2009 at 14:02

Chris Ballance

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2 Comments

LukeH Over a year ago

@Chris: The question title is a bit misleading. The code in the question is just using the ASP.NET cache, not output caching.

Chris Ballance Over a year ago

Thanks for the clarification Luke, I have updated my answer accordingly

Olaf · Accepted Answer · 2009-09-01 14:06:04Z

1

The solution is going to be somewhat dirty anyway if you can't change the code (the clean way would be to use SqlCacheDependency).

Can you change the Global.asax.cs (although it's source code as well)? You can access the HttpContext from here and empty the cache in your code.

answered Sep 1, 2009 at 14:06

Olaf

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1 Comment

Nick Over a year ago

Well, not really. I don't have access to deploying source on that server. I do have remote access and can do what needs to be done in the IIS (if that would help)

Keplerf1 · Accepted Answer · 2009-09-01 14:40:13Z

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iisreset should work. Whenever the ASP.Net application is unloaded from memory it will clear out any server managed Session data. Even just touching the web.config should unload the app.

answered Sep 1, 2009 at 14:40

Keplerf1

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Comments

Nick · Accepted Answer · 2009-09-01 14:24:08Z

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iisreset did work! I did'nt notice the changes as the IE was caching the datasets. So, the original question is not fully accurate.

Thanks

answered Sep 1, 2009 at 14:24

Nick

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1 Comment

RichardOD Over a year ago

Yeap- it will always work, though touching the web.config as Keplerf1 mentions is a better technique.

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