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Add System.Collections.Concurrent.ConcurrentHashSet<T> #133985
Description
Background and motivation
Basically reopening issue #39919.
I'm pretty sure that even a simple wrapper around ConcurrentDictionary<T, byte> would be useful. There must be many codebases out there that either implement their own ConcurrentHashSet<T> or use ConcurrentDictionary<T, byte> as a workaround.
API Proposal
API Usage
Alternative Designs
No response
Risks
No response
Activity
dotnet-policy-service commentedon Sep 15, 2026
Tagging subscribers to this area: @dotnet/area-system-collections
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eiriktsarpalis commentedon Sep 16, 2026
I don't believe much has changed since the original decision closing #39919 (comment) was made. Adding a new collection type isn't free -- both from a design and a maintenance perspective -- and frankly this doesn't seem to meet the bar given such an obvious workaround is already available.