public static class PagedListExtensions    {        /// 
        /// PagedList        /// 
        ///         /// 1为起始页        ///         ///         public static async Task> ToPagedListAsync(            this IQueryable query,            int pageIndex,            int pageSize,            CancellationToken cancellationToken = default)        {            if (pageIndex < 1) throw new ArgumentOutOfRangeException(nameof(pageIndex));            int realIndex = pageIndex - 1;            int count = await query.CountAsync(cancellationToken).ConfigureAwait(false);            var items = await query.Skip(realIndex * pageSize)                                   .Take(pageSize)                                   .ToListAsync(cancellationToken)                                   .ConfigureAwait(false);            return new Page(items, pageIndex, pageSize, count);        }
        public static Page ToPagedList(            this IQueryable query,            int pageIndex,            int pageSize)        {            if (pageIndex < 1) throw new ArgumentOutOfRangeException(nameof(pageIndex));            int realIndex = pageIndex - 1;            int count = query.Count();            var items = query.Skip(realIndex * pageSize)                             .Take(pageSize)                             .ToList();            return new Page(items, pageIndex, pageSize, count);        }    }

/// 
    /// 分页列表    /// 
    public class Page    {        public Page()        {
         }
       public Page(List items, int pageIndex, int pageSize, int totalCount)       {            PageIndex = pageIndex;            PageSize = pageSize;            Total = totalCount;            PageTotal = (int)Math.Ceiling(totalCount / (double)pageSize);            Items = items;        }
        /// 
        /// 当前页码        /// 
        public int PageIndex { get; set; }
        /// 
        /// 每页记录数        /// 
        public int PageSize { get; set; }
        /// 
        /// 总记录数        /// 
        public int Total { get; set; }
        /// 
        /// 总页数        /// 
        public int PageTotal { get; set; }
        /// 
        /// 分页数据        /// 
        public List Items { get; set; }    }