arx 在不打开文件的情况下添加带属性的块的问题

arx 在不打开文件的情况下添加带属性的块，块的对齐方式总是左对齐， 只有在打开文件的情况下是正确的，需要加如下语句:

            HostApplicationServices.WorkingDatabase = db;

//完整的函数如下

 /// <summary>
        /// 批量处理图纸 自已选择得到文件路径列表的
        /// </summary>
        /// <param name="cationOpenDlg">打开窗口的cation</param>
        /// <param name="cationWait">等待窗口的cation</param>
        /// <param name="DwgOp">处理函数，使用委托</param>
        public static void SetDwgsData(string cationOpenDlg, string cationWait, string msgFinish, DelegateSet Op)
        {
            System.Windows.Forms.FolderBrowserDialog dlg = new System.Windows.Forms.FolderBrowserDialog();
            if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.Cancel) return;
            string dicPath = dlg.SelectedPath;
            if (dicPath == "") return;

            List<string> files = new List<string>(); //路径字符串列表
            GetFileList(dicPath, files);

            using (frmWaiting frm = new frmWaiting())
            {
                frm.Count = files.Count;
                frm.Fun = cationWait;
                Application.ShowModelessDialog(frm);
                System.Windows.Forms.Application.DoEvents(); //释放CPU控制权;

                if (Application.DocumentManager.Count == 0) Application.DocumentManager.Add("acadiso.dwt");
                Document doc = Application.DocumentManager.MdiActiveDocument;
                DocumentLock lockDoc = doc.LockDocument();
                using (lockDoc)
                {
                    //打开图形数据库db 多张图纸时使用
                    int i = 0;
                    foreach (string fileName in files)
                    {
                        frm.Index = ++i;
                        frm.FileName = fileName;
                        System.Windows.Forms.Application.DoEvents();
                        frm.Update();
                        Database db = ArxHlb.CADEntAdd.Getdb(fileName, System.IO.FileShare.ReadWrite, false);
                        HostApplicationServices.WorkingDatabase = db; //需要置为当前数据库
                        using (Transaction tr = db.TransactionManager.StartTransaction())
                        {
                            BlockTable bt = tr.GetObject(db.BlockTableId, OpenMode.ForWrite) as BlockTable;
                            BlockTableRecord btr = tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;
                            Op(db, tr, bt, btr);//委托的函数
                            tr.Commit();
                        }
                        db.SaveAs(db.Filename, DwgVersion.Current);
                    }
                }
                HostApplicationServices.WorkingDatabase = doc.Database;//需要还原，否则打开出错
            }
            SWF.MessageBox.Show(msgFinish);
        }