Steven Giesel • 6/26/2024

ReadOnlySet<T> in .NET 9

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This article details the introduction of the ReadOnlySet<T> type in .NET 9 Preview 6. It explains the limitations of the IReadOnlySet<T> interface and why common workarounds like ImmutableHashSet or FrozenSet are inefficient or conceptually wrong. The piece covers the technical rationale, provides code examples, and links to the official API proposal.

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#c #Collections #Immutability
ReadOnlySet<T> in .NET 9

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