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Intersect by


New Linq Extention


public static IEnumerable IntersectBy<TSource, TKey>(
this IEnumerable first,
IEnumerable second,
Func<TSource, TKey> keySelector,
IEqualityComparer keyComparer)
HashSet keys = new HashSet(first.Select(keySelector),
foreach (var element in second)
TKey key = keySelector(element);
// Remove the key so we only yield once
if (keys.Remove(key))
yield return element;




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