public interface IPagedList<T> : IList<T>
{
    PagingInformation Paging { get; set; }
}

public class PagedList<T> : List<T>, IPagedList<T> //, IList<T>
{
    public PagingInformation Paging { get; set; }

    public PagedList()
    {
    }

    public PagedList(IEnumerable<T> collection) : base(collection)
    {
    }

    public PagedList(IEnumerable<T> collection, PagingInformation paging) : base(collection)
    {
        Paging = paging;
    }

    public PagedList(int capacity) : base(capacity)
    {
    }

    PagingInformation IPagedList<T>.Paging
    {
        get => Paging;
        set => Paging = value;
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }


}

public async Task<DomainResult<IPagedList<PositionDto>>> GetPagedListAsync(int pageIndex = 0, int pageSize = 20)
{
    return DomainResult<IPagedList<PositionDto>>.Success(_mapper.Map<IPagedList<PositionDto>>(await _positionRepository.GetPagedListAsync(pageIndex, pageSize)));
}