using (Transaction trans = db.TransactionManager.StartTransaction()) BlockTable bt = trans.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable; BlockTableRecord btr = trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;
Document doc = Application.DocumentManager.MdiActiveDocument; Database db = doc.Database; code for autocad
[CommandMethod("DrawRedCircle")] public void DrawRedCircle() using (Transaction trans = db
| | Primary API | Key Characteristics | | :--- | :--- | :--- | | 1980s-1990s | AutoLISP | Interpreted, easy to learn, ideal for simple automation but slow for graphics. | | 1990s-2000s | Visual LISP (VBA) | Integrated development environment (IDE), closer integration with ActiveX objects. | | 2000s-2010s | ObjectARX (C++) | Native compilation, direct access to AutoCAD database, maximum performance. | | 2010s-Present | .NET (C#/VB.NET) | Managed code, balance of performance and safety, robust API via AcDbMgd.dll . | | 2020s+ | Python (PyAutoCAD) & Web | Cloud collaboration, accoreconsole for headless operation, webhooks. | | | 2010s-Present |
btr.AppendEntity(circle); trans.AddNewlyCreatedDBObject(circle, true); trans.Commit();