.Net 分页功能实现

 public class PaginatedList<TEntity> : List<TEntity>
{
        public int PageIndex { get; private set; }

        public int PageSize { get; private set; }

        public int TotalCount { get; private set; }

        public int TotalPageCount { get; private set; }

        public bool HasPreviousPage => (PageIndex > 1);

        public bool HasNextPage
        {

            get
            {
                return (PageIndex < TotalPageCount);
            }
        }


        public PaginatedList()
        { }

        public PaginatedList(IEnumerable<TEntity> source, int pageIndex, int pageSize, int totalCount) : this()
        {

            if (source == null)
            {
                throw new ArgumentNullException("source");
            }

            AddRange(source);
            PageIndex = pageIndex;
            PageSize = pageSize;
            TotalCount = totalCount;
            TotalPageCount = (int)Math.Ceiling(totalCount / (double)pageSize);
        }
    }