/// <summary>
        /// 模糊查询姓名和电话号码，并按姓名排序返回
        /// </summary>
        /// <param name="search">要搜索的字符</param>
        /// <returns></returns>
        public IQueryable<UserInfo> Search(string search)
        {
            return pwDb.Set<UserInfo>().Where(n => n.Name.Contains(search)||n.PhoneNum.Any(t=>t.Tel.Contains(search))).OrderBy(n=>n.Name);
        }