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Asked: 2026-06-12T00:30:18+00:00

I need a thread-safe collection to hold items without duplicates. ConcurrentBag<T> allows non-unique items

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I need a thread-safe collection to hold items without duplicates. ConcurrentBag<T> allows non-unique items and HashSet<T> is not thread-safe. Is there a collection like this in .NET Framework 4.5?

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  1. Editorial Team

    I suggest you use a ConcurrentDictionary and just use a dummy value for each entry. It’s annoying in terms of efficiency (having all those dummy values) but I suspect in the majority of applications that would be insignificant.

    You may well want to wrap this in your own ConcurrentSet implementation, which just does enough for your purposes, so that you don’t need to see the abstraction leakiness in much of your code.

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