为什么得不到块的属性值

kids · 发表于 2015-10-27 00:04:00

用dwgdirect写的，代码如下
using (Services services = new Services())
         {
            Database db=new Database(false,false);
            db.ReadDwgFile(path+"5T-267.dwg",FileShare.Read,false,null);
            BlockTable bt;
            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                  bt = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
                  BlockTableRecord btr = new BlockTableRecord();
                  foreach (ObjectId bto in bt)
                  {
                     btr = (BlockTableRecord) tr.GetObject(bto,OpenMode.ForRead);
                     if (btr.Name == "CAD_BOM")
                     {
                        foreach (ObjectId id in btr)
                        {
                              DBObject obj = (DBObject)tr.GetObject(id, OpenMode.ForRead);
                              AttributeDefinition ad = obj as AttributeDefinition;
                              if (ad != null)
                              {
                                 MessageBox.Show(ad.Tag.ToString());
                                 MessageBox.Show(ad.TextString.ToString());//，为什么显示为空？还有如果我这个bom中有多行如何把每个tag的多行值都显示出来？请哪位给予指点
                              }
                        }
                     }
                  }
                  tr.Commit();
            }
         }