SequenceEqual< TSource >() [2/2]

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

inlinestatic

Definition at line 7454 of file Enumerable.cs.

    {
        if (first == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.first);
        }
        if (second == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.second);
        }
        if (first is ICollection<TSource> collection && second is ICollection<TSource> collection2)
        {
            if (first is TSource[] array && second is TSource[] array2)
            {
                return ((ReadOnlySpan<TSource>)array).SequenceEqual((ReadOnlySpan<TSource>)array2, comparer);
            }
            if (collection.Count != collection2.Count)
            {
                return false;
            }
            if (collection is IList<TSource> list && collection2 is IList<TSource> list2)
            {
                if (comparer == null)
                {
                    comparer = EqualityComparer<TSource>.Default;
                }
                int count = collection.Count;
                for (int i = 0; i < count; i++)
                {
                    if (!comparer.Equals(list[i], list2[i]))
                    {
                        return false;
                    }
                }
                return true;
            }
        }
        using IEnumerator<TSource> enumerator = first.GetEnumerator();
        using IEnumerator<TSource> enumerator2 = second.GetEnumerator();
        if (comparer == null)
        {
            comparer = EqualityComparer<TSource>.Default;
        }
        while (enumerator.MoveNext())
        {
            if (!enumerator2.MoveNext() || !comparer.Equals(enumerator.Current, enumerator2.Current))
            {
                return false;
            }
        }
        return !enumerator2.MoveNext();
    }

References System.array, System.collection, System.comparer, System.Linq.count, System.Collections.Generic.Dictionary< TKey, TValue >.Count, System.Linq.first, System.Collections.Generic.Dictionary< TKey, TValue >.GetEnumerator(), System.list, System.Linq.second, and System.Linq.ThrowHelper.ThrowArgumentNullException().