Clean way to return array indices matching a condition using LINQ?

Personally, I'd go with this: myarray . Select((p, i) => new { Item = p, Index = I }) . Where(p => SomeCondition(p.

Item)) . Select(p => p. Index).

I would probably write an extension method, but if I chose not to, I would do this: array . Select((item, index) => SomeCondition(item)? Index : -1) .

Where(index => index! = -1); It's exactly what you are doing already, but less verbose since it uses the ternary if operator instead of the if/else block.

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