如何删除被锁定的MDB工作空间？无法先解锁工作空间

        一个写在cad中的插件，将cad数据写入access个人地理数据库，在写入完毕后释放了所有用到的com，

            ComReleaser.ReleaseCOMObject(ipWsFactory);

            ComReleaser.ReleaseCOMObject(pWorkSpace);

            ComReleaser.ReleaseCOMObject(ipWsFactoryLock);



            ComReleaser.ReleaseCOMObject(featureClass);

            ComReleaser.ReleaseCOMObject(geometry);

            listUsedCassEntity = null;

            GC.Collect();

 
并且用IWorkspaceFactoryLockControl解了锁，但ldb文件还是存在，无法删除mdb工作空间。

            IWorkspaceFactory ipWsFactory = new AccessWorkspaceFactoryClass();

            IWorkspace pWorkSpace = ipWsFactory.OpenFromFile(saveMDBPath, 0);

            IWorkspaceFactoryLockControl ipWsFactoryLock = null;

            try

            {

                //关闭资源锁定  

                ipWsFactoryLock = (IWorkspaceFactoryLockControl)ipWsFactory;

                if (ipWsFactoryLock.SchemaLockingEnabled)

                {

                    ipWsFactoryLock.DisableSchemaLocking();

                }

            }

            catch (System.Exception ex)

            {

                fmeLogFile_.LogMessageString("  解除数据库锁失败！" + ex.ToString(), FMEOMessageLevel.Inform);

                return;

            }

        用File.delete删除时报cad占用；用IDataset删除时报com错误。