Contains< TSource >() [2/2]

static bool System.Linq.Enumerable.Contains< TSource > ( this IEnumerable< TSource > source, TSource value, IEqualityComparer< TSource >? comparer )

inlinestatic

Definition at line 4406 of file Enumerable.cs.

    {
        if (source == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
        }
        if (comparer == null)
        {
            foreach (TSource item in source)
            {
                if (EqualityComparer<TSource>.Default.Equals(item, value))
                {
                    return true;
                }
            }
        }
        else
        {
            foreach (TSource item2 in source)
            {
                if (comparer.Equals(item2, value))
                {
                    return true;
                }
            }
        }
        return false;
    }

References System.comparer, System.Linq.Default, System.item, System.Linq.source, System.Linq.ThrowHelper.ThrowArgumentNullException(), and System.value.