What is the best way to lock cache in asp.net?

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Here’s the basic pattern:

  • Check the cache for the value, return if its available
  • If the value is not in the cache, then implement a lock
  • Inside the lock, check the cache again, you might have been blocked
  • Perform the value look up and cache it
  • Release the lock

In code, it looks like this:

private static object ThisLock = new object();

public string GetFoo()
{

  // try to pull from cache here

  lock (ThisLock)
  {
    // cache was empty before we got the lock, check again inside the lock

    // cache is still empty, so retreive the value here

    // store the value in the cache here
  }

  // return the cached value here

}

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