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System.Runtime.MemoryCache.GetValues(IEnumerable <string>) will cause a LockRecursionException if the cache contains expired items.
The scenario is:
* the polling interval is high, say 10s
* items are added with a short lifespan
* calling GetValues() results in a call to MemoryCacheContainer.GetEntry() which does an EnterReadLock() on the cache
* assuming the item is still in the cache then ExpireIfNeeded() is called which does an EnterWriteLock() - and we get an exception
MemoryCacheContainer.Get() does an EnterUpgradeableReadLock() - and this is the fix in this case.
Fix made in pull #938
Merged into master in: a678a101ee746e0c8f89f8e67c4a668d2af45d14