She looked back at the Block Net. It was no longer dormant. It was live —and connected to every AutoCAD block in the city. Every door, every street sign, every manhole cover. The net treated them as nodes in a vast, editable infrastructure.
public void CreateBlockDefinition(string blockName) Document doc = Application.DocumentManager.MdiActiveDocument; Database db = doc.Database; using (Transaction tr = db.TransactionManager.StartTransaction()) BlockTable bt = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable; if (!bt.Has(blockName)) using (BlockTableRecord btr = new BlockTableRecord()) btr.Name = blockName; btr.Origin = new Point3d(0, 0, 0); bt.UpgradeOpen(); bt.Add(btr); tr.AddNewlyCreatedDBObject(btr, true); // Add geometry to the block here (e.g., a Circle) Circle circle = new Circle(new Point3d(0, 0, 0), Vector3d.ZAxis, 2.0); btr.AppendEntity(circle); tr.AddNewlyCreatedDBObject(circle, true); tr.Commit(); Use code with caution. 4. Inserting a Block Reference autocad block net
The AutoCAD database is unmanaged code wrapped in .NET. If you don't dispose of your Transactions properly, you risk memory leaks and "Object is not in database" errors. The using pattern ensures the transaction is disposed of even if an exception occurs. She looked back at the Block Net