using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Bowin.Common
{
    public class PageList<T>
    {
        /// <summary>
        /// 构造函数,当 pageIndex 或 pageSize 为null时，获取全部数据。
        /// </summary>
        /// <param name="query"></param>
        /// <param name="pageIndex">页码，从1开始</param>
        /// <param name="pageSize">页数</param>
        public PageList(IQueryable<T> query, int? pageIndex, int? pageSize)
        {
            if (pageSize.HasValue && pageIndex.HasValue)
            {
                Total = query.Count();
                Items = query.Skip((pageIndex.Value - 1) * pageSize.Value).Take(pageSize.Value);
            }
            else
            {
                Total = query.Count();
                Items = query;
            }
        }

        public int Total { get; private set; }

        public IQueryable<T> Items { get; private set; }
    }
}