Union< TSource >() [2/2]

static IEnumerable< TSource > System.Linq.Enumerable.Union< TSource > ( this IEnumerable< TSource > first, IEnumerable< TSource > second, IEqualityComparer< TSource >? comparer )

inlinestatic

Definition at line 8475 of file Enumerable.cs.

    {
        if (first == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.first);
        }
        if (second == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.second);
        }
        if (!(first is UnionIterator<TSource> unionIterator) || !Utilities.AreEqualityComparersEqual<TSource>(comparer, unionIterator._comparer))
        {
            return new UnionIterator2<TSource>(first, second, comparer);
        }
        return unionIterator.Union(second);
    }

References System.Collections.Generic.Dictionary< TKey, TValue >._comparer, System.comparer, System.Linq.first, System.Linq.second, and System.Linq.ThrowHelper.ThrowArgumentNullException().