Iterating over generic concurrent collections

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Is safe to iterate over a generic concurrent collections on worker threads without locking on them (ConcurrentQueue, ConcurrentDictionary, ConcurrentStack, etc)?

Posted 1-May-14 7:27am

d.allen101

Updated 1-May-14 7:28am

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Sergey Alexandrovich Kryukov 1-May-14 13:35pm

What's wrong about reading standard MDSN documentation on these types?
—SA

d.allen101 2-May-14 11:10am

I did read it. I understand that ConcurrentCollections lock on Adding and Removing Items but I don't understand why I throw an exception when I try to iterate over a ConcurrentCollection. If it's thread safe shouldn't it be locked while I'm performing an iteration, therefore throwing no Exception. I'm not understanding how it works. I know how to use it but I was trying to understand why and how it works. And I'm getting it wrong. Will you explain it to me SA? Thanks!

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-05-01T07:35:00

Yes of course. Isn't that apparent from the documentation of these classes, even from their names? This is what they have been designed for. Moreover, such collections can server as a certain kind of thread synchronization utility for threads, because, say, they serialize data added to the same collection by different threads.

—SA