Accessing the ASP.NET Cache from a Separate Thread?

Question

Normally i have a static class that reads and writes to HttpContext.Current.Cache

However since adding threading to my project, the threads all get null

Answer 1

The System.Web.Cache object itself is thread safe.

The issue is how to obtain a reference to it in a way that works throughout your application. HttpContext.Current returns null unless it is called on a thread that is handling an ASP.NET request. An alternative way to get the Cache is through the static property System.Web.HttpRuntime.Cache. This will avoid the problems with the HttpContext.

Answer 2

If your project is an ASP.NET project, then it was multithreaded even before you "added threading".

Check to see if HttpContext.Current is non-null before referencing HttpContext.Current.Cache.

Also, please post the complete exception you're receiving, and show us the code that references the cache.