CreateForJoin()

static Lookup< TKey, TElement > System.Linq.Lookup< TKey, TElement >.CreateForJoin ( IEnumerable< TElement > source, Func< TElement, TKey > keySelector, IEqualityComparer< TKey > comparer )

inlinestaticpackage

Definition at line 108 of file Lookup.cs.

    {
        Lookup<TKey, TElement> lookup = new Lookup<TKey, TElement>(comparer);
        foreach (TElement item in source)
        {
            TKey val = keySelector(item);
            if (val != null)
            {
                lookup.GetGrouping(val, create: true).Add(item);
            }
        }
        return lookup;
    }

References System.Add, System.comparer, System.item, System.Linq.keySelector, and System.Linq.source.