忽略块 ** 的重复定义

既然本图中已经存在此块，可以将插入块中的重复的块改个名字

//  houlinbo QQ420021327

private static void ClearReBtr( Database newdb , BlockTable bt)
        {
            try
            {
                Transaction tr = newdb.TransactionManager.StartTransaction();
                using (tr)
                {
                    BlockTable newbt = tr.GetObject(newdb.BlockTableId, OpenMode.ForWrite) as BlockTable;

                    foreach (ObjectId objId in newbt)
                    {
                        BlockTableRecord newbtr = tr.GetObject(objId, OpenMode.ForRead) as BlockTableRecord;
                        if (bt.Has(newbtr.Name) && !newbtr.Name.Equals("*Model_Space") && !newbtr.Name.Contains ("*Paper_Space"))
                        {
                            newbtr.UpgradeOpen(); //升级写打开  
                            newbtr.Name ="*U";
                        }
                    }
                }
            }
            catch
            { }
        }