Books.Service/BookService.cs

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using Books.Service.Entity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;

namespace Books.Service
{
    public class BookService
    {
        /// <summary>
        /// 分页
        /// </summary>
        /// <param name="pageSize">一页多少条</param>
        /// <param name="pageIndex">第几页</param>
        /// <param name="total">共多少条</param>
        /// <param name="where">筛选条件可多条</param>
        /// <returns></returns>
        public List<BookEntity> GetPageDate(int pageSize, int pageIndex, out int total,Expression<Func<BookEntity,bool>> where)
        {
            BaseService<BookEntity> bs = new BaseService<BookEntity>();
            var list = bs.GetAll();
            IQueryable<BookEntity> li = null ;
           
             li=list.Where(where);
            total = li.Count();
            return li.OrderBy(e=>e.CreateDateTime).Skip(pageSize * (pageIndex - 1)).Take(pageSize).ToList(); 
        }
        public BookEntity GetBook(int id)
        {
            BaseService<BookEntity> bs = new BaseService<BookEntity>();
            return bs.GetId(id);
        }
    }
}