Some of the dialogue from this question turned out to be ugly, and I was asked to ask a new question, but since there is an answer, I can’t remove it, despite the similarities (rather lame, Stackoverflow).
Please check out this question:
Implementing hashable HashSet content in C # (e.g. `frozenset in python`)
You need an ImmutableHashSet<> . Your time is good, it is available through NuGet in the Microsoft.Collections.Immutable package .
ImmutableHashSet<>
For background, see Immutable Collections Preview released on NuGet . A video of Inside Immutable Collections is also available.
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