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Editorial Team
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Editorial Team
Asked: June 16, 20262026-06-16T19:47:31+00:00 2026-06-16T19:47:31+00:00

Will the Enumerable.Distinct method remove all duplicates from a collection implementing IEnumerable even if

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Will the Enumerable.Distinct method remove all duplicates from a collection implementing IEnumerable even if it is not sorted?

I’m coming from a C++ background and wonder if Distinct behaves similiar to C++ unique algorithm where the sequence has to be sorted.

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  1. Editorial Team
    Editorial Team
    2026-06-16T19:47:31+00:00Added an answer on June 16, 2026 at 7:47 pm

    Will the Enumerable.Distinct method remove all duplicates from a
    collection implementing IEnumerable even if it is not sorted?

    Yes.

    Note that you need to implement the IEqualityComparer<T> interface and it’s Equals and GetHashCode methods for custom types.

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