How to make ObservableCollection thread-safe?

Question

System.InvalidOperationException: Collection was modified; enumeration operation may not execute.

I am adding/removing from an ObservableCollection

Answer 1

The solution Franck posted here will work in the case where one thread is adding things, but ObservableCollection itself (and List, which it's based on) are not thread-safe. If multiple threads are writing to the collection, hard-to-track-down bugs could be introduced. I wrote a version of ObservableCollection that uses a ReaderWriteLockSlim to be truly thread-safe.

Unfortunately, it hit the StackOverflow character limit, so here it is on PasteBin. This should work 100% with multiple readers/writers. Just like regular ObservableCollection, it's invalid to modify the collection in a callback from it (on the thread that received the callback).