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Possible Duplicate:
Are IEnumerable Linq methods thread-safe?
quick question. Will using Where,Single,SingleorDefault on a list while other threads access it (read but also write) cause collection changes while enumerating exception?
why doesn’t the c# 4.0 have concurrent List?
List<T>is safe to read from multiple threads, but doesn’t support writing at all. So you can execute multiple LINQ queries against the list so long as they don’t make any changes. You could useReaderWriterLockSlimto obtain a write lock only for times where you need to write.I believe it’s hard to create an implementation which keeps the same guarantees as
List<T>in terms of ordering, but is also thread-safe and efficient. The concurrent collections in .NET 4 are efficient, at the cost of some guarantees (such as ordering in the case ofConcurrentBag<T>).