When you want to bring a WBLOCK into a new drawing, you can use the INSERT command and browse for your file.
Once a definition exists, you can "insert" it into the Model Space by creating a BlockReference . Locate the BlockTableRecord ID.
using Autodesk.AutoCAD.Runtime; using Autodesk.AutoCAD.ApplicationServices; using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.Geometry; public class BlockManager [CommandMethod("CreateMyBlock")] public void CreateBlockDefinition() Document doc = Application.DocumentManager.MdiActiveDocument; Database db = doc.Database; using (Transaction trans = db.TransactionManager.StartTransaction()) // Open the Block Table for read/write BlockTable blockTable = trans.GetObject(db.BlockTableId, OpenMode.ForWrite) as BlockTable; string blockName = "CustomCircleBlock"; // Check if the block definition already exists if (!blockTable.Has(blockName)) using (BlockTableRecord newBlockDef = new BlockTableRecord()) newBlockDef.Name = blockName; // Set the insertion base point (Origin) newBlockDef.Origin = new Point3d(0, 0, 0); // Create geometry to add to the block definition using (Circle circle = new Circle(new Point3d(0, 0, 0), Vector3d.ZAxis, 5.0)) circle.ColorIndex = 1; // Red // Append geometry to the block definition record newBlockDef.AppendEntity(circle); trans.AddNewlyCreatedDBObject(circle, true); // Add the new block definition to the Block Table blockTable.Add(newBlockDef); trans.AddNewlyCreatedDBObject(newBlockDef, true); doc.Editor.WriteMessage($"\nBlock 'blockName' created successfully."); else doc.Editor.WriteMessage($"\nBlock 'blockName' already exists."); trans.Commit(); Use code with caution. 4. Inserting a Block Reference autocad block net
| Term | Description | |------|-------------| | BlockTable | Container for all block definitions in a drawing (including model space, paper space). | | BlockTableRecord | A specific block definition (e.g., "MyChair", "*Model_Space"). | | BlockReference | An instance (insertion) of a block definition placed in a space. | | ObjectId | Handle to an object in the drawing database. |
tr.Commit();
What is the most complex block automation challenge you've faced in .NET? Let's discuss in the comments.
[CommandMethod("InsertMyBlock")] public void InsertBlockInstance() Document doc = Application.DocumentManager.MdiActiveDocument; Database db = doc.Database; using (Transaction trans = db.TransactionManager.StartTransaction()) BlockTable blockTable = trans.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable; string blockName = "CustomCircleBlock"; if (!blockTable.Has(blockName)) doc.Editor.WriteMessage($"\nError: Block 'blockName' definition not found."); return; // Open Model Space for write BlockTableRecord modelSpace = trans.GetObject(blockTable[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord; // Get the Object ID of the block definition ObjectId blockDefId = blockTable[blockName]; // Define positioning properties Point3d insertPoint = new Point3d(10, 10, 0); Scale3d scale = new Scale3d(1.0, 1.0, 1.0); double rotationAngle = 0.0; // In radians // Create the Block Reference using (BlockReference blockRef = new BlockReference(insertPoint, blockDefId)) blockRef.ScaleFactors = scale; blockRef.Rotation = rotationAngle; // Add the Block Reference to Model Space modelSpace.AppendEntity(blockRef); trans.AddNewlyCreatedDBObject(blockRef, true); trans.Commit(); doc.Editor.WriteMessage($"\nInserted instance of 'blockName' at insertPoint."); Use code with caution. 5. Working with Attributes in Blocks When you want to bring a WBLOCK into
The .NET API enables batch extraction of block data from hundreds of DWG files. This is useful for generating bills of materials, asset inventories, or compliance reports.
using (Database libDb = new Database(false, true)) using Autodesk
A block reference is an "instance" of a block definition placed in model space or paper space. Multiple references can share the same definition. Each reference can have its own position, scale, and rotation. You cannot iterate a block reference to find the original objects that compose it, but you can iterate the original block definition or explode the block reference into its original components.