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Asked: 2026-06-15T15:31:18+00:00

I have a class in my code that is already deriving from IEnumerable. I

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I have a class in my code that is already deriving from IEnumerable.
I was wondering if there is a way that I can use a “Contains” method on its instnaces to look for a something in that list?

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  1. Editorial Team

    Do you really implement the non-generic IEnumerable, or the generic IEnumerable<T>? If you can possibly implement the generic one, your life will become a lot simpler – as then you can use LINQ to Objects, which does indeed have a Contains extension method.

    Otherwise, you could potentially convert from the non-generic to generic using Cast or OfType, e.g.

    bool found = nonGeneric.Cast<TargetType>().Contains(targetItem);

    It would be nicer if you just implemented the generic interface to start with though 🙂

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