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Enumerable.ToLookup Method (this IEnumerable<TSource>, Func<TSource, TKey>)
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Creates a Lookup{TKey,TElement} from an IEnumerable{T} according to a specified key selector function.

Syntax
C++
C#
Visual Basic
public: ILookup<TKey, TSource> ToLookup<TSource, TKey>( this IEnumerable<TSource> source, Func<TSource, TKey> keySelector );
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