George

Oh, I see. Too bad multi-targeting is not possible for VS, as otherwise you could have used newer APIs for this feature, while simply not making it visible to the...

> Are you saying that the key in the ConcurrentDictionary cache's Type key will be null? Yes, exactly!

Unfortunately I do not now remember exactly. But it had something to do with the other IEnumerable issue and Json Serialization. I think under some circumstances the type could not...

I was able to dig up a screenshot from that debugging session:  So it happens not when adding a new item, but when checking the item exists.

Yes, that makes sense. I still unfortunately do not remember now the exact circumstances now why it happened, but I think it had to do with json and serialization, and...