Is the List.AddRange() thread safe?

Question

Can I, without locking, safely call List.AddRange(r) from multiple threads? If not, what sort of trouble would I run into?

Answer 1

Depending on your usage, SynchronizedCollection could work.

You'd have no single-shot AddRange though. If you are only using this to seed the collection, you can do this as there is an IEnumerable constructor overload.