/// <summary>
        /// 更新由反序列化后得到的“离线”实体 TMaster。
        /// 首先要先得到 子表 的哪些主键是新增的、更改的、删除的
        /// </summary>
        /// <param name="detachedMaster"></param>
        /// <param name="insertedIds"></param>
        /// <param name="updatedIds"></param>
        /// <param name="deletedIds"></param>
        /// <returns></returns>
        bool UpdateDetachedMaster(TMaster detachedMaster, int[] insertedIds, int[] updatedIds, int[] deletedIds)
        {
            using (DbDataContext db = new DbDataContext( connection )
            {
                foreach (int detailId in insertedIds)
                {
                    db.TDetail.InsertOnSubmit(detachedMaster.TDetail.First(detail => detail.detailId == detailId));
                }
                foreach (int detailId in updatedIds)
                {
                    db.TDetail.Attach(detachedMaster.TDetail.First(detail => detail.detailId == detailId), true);
                }
                foreach (int detailId in deletedIds)
                {
                    db.TDetail.DeleteOnSubmit(detachedMaster.TDetail.First(detail => detail.detailId == detailId));
                }
                db.TMaster.Attach(detachedMaster, true);

                // 可以获取 db.GetChangeSet() 进行日志操作等;
                db.SubmitChanges();
            }
            return true;
        }