/// <summary>
        /// 用户登录日志列表
        /// </summary>
        /// <param name="userName">用户名</param>
        /// <param name="nowNumber">当前数字</param>
        /// <param name="pageSize">长度</param>
        /// <param name="rowCount">总行数</param>
        /// <returns>用户登录日志列表</returns>
        public IQueryable<object> LoadLogList(string userName, int nowNumber, int pageSize, out int rowCount)
        {
            IQueryable<object> result = null;
            if (String.IsNullOrEmpty(userName))
            {
                result = from a in db.Set<AdminLoginLog>()
                         join b in db.Set<Admin>() on a.AdminId equals b.AdminId into b_join
                         from b in b_join.DefaultIfEmpty()
                         orderby
                           a.AdminLoginTime descending
                         select new
                         {
                             AdminId = (Int32?)a.AdminId,
                             AdminLoginAddress = a.AdminLoginAddress,
                             a.AdminLoginBrowser,
                             a.AdminLoginIP,
                             a.AdminLoginLogId,
                             a.AdminLoginTime,
                             AdminUserName = b.AdminUserName
                         };
            }
            else
            {
                result = from a in db.Set<AdminLoginLog>()
                         join b in db.Set<Admin>() on a.AdminId equals b.AdminId into b_join
                         from b in b_join.DefaultIfEmpty()
                         where
                            b.AdminUserName == userName
                         orderby
                           a.AdminLoginTime descending
                         select new
                         {
                             AdminId = (Int32?)a.AdminId,
                             a.AdminLoginAddress,
                             a.AdminLoginBrowser,
                             a.AdminLoginIP,
                             a.AdminLoginLogId,
                             a.AdminLoginTime,
                             AdminUserName = b.AdminUserName
                         };
            }
            rowCount = result.Count();
            result = result.Skip(nowNumber).Take(pageSize);
            return result;
        }