[Solved] How to change loop of nested lists linq

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Avoiding the foreach will lose a small amount of performance and make the code harder to follow, but based on your (probably wrong) question, here is the equivalent LINQ:

var ans = listL1.elements.SelectMany(level1 => level1.elements.SelectMany(level2 => listL2.elements.Select(level3 => new Level() { itemFromLevel1 = level1, itemFromLevel2 = level2, itemFromLevel3 = level3}))).ToList();

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solved How to change loop of nested lists linq