塊參照重新命名

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#region 重新命名塊參照
        /// <summary>
        /// 重新命名塊參照
        /// </summary>
        /// <param name="db"> 當前資料庫</param>
        /// <param name="oldBlockname">塊參照舊名</param>
        /// <param name="newBlockname">塊參照新名</param>
        public static void RenameBlock(this Database db, string oldBlockname, string newBlockname)
        {
            using (Transaction trans = db.TransactionManager.StartTransaction())
            {
                //擷取當前塊表
                BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead, true);
                BlockTableRecord btr = (BlockTableRecord)trans.GetObject(bt["dHead"], OpenMode.ForWrite, true);
                btr.Name = newBlockname;
                trans.Commit();
            }
        }
        #endregion