Every drawing database contains a set of symbol tables. The most critical table for geometric content is the .
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The following C# example demonstrates how to create a simple rectangular block named "Equipment_Box":
[CommandMethod("InsertMyBlock")] public void InsertBlockInstance() 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; string blockName = "Equipment_Box"; if (!bt.Has(blockName)) doc.Editor.WriteMessage($"\nError: Block 'blockName' not found. Run 'CreateMyBlock' first."); return; // Open Model Space for writing BlockTableRecord modelSpace = tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord; // Get the Object ID of the block definition ObjectId blockId = bt[blockName]; // Define insertion properties Point3d position = new Point3d(20, 20, 0); Scale3d scale = new Scale3d(1.5, 1.5, 1.5); double rotation = Math.PI / 4; // 45 degrees in radians // Create the BlockReference using (BlockReference br = new BlockReference(position, blockId)) br.ScaleFactors = scale; br.Rotation = rotation; // Append the reference to Model Space modelSpace.AppendEntity(br); tr.AddNewlyCreatedDBObject(br, true); tr.Commit(); doc.Editor.WriteMessage("\nBlock reference inserted successfully."); Use code with caution. 5. Working with Dynamic Blocks autocad block net
The AutoCAD .NET API offers absolute control over blocks, definitions, and geometric attributes. By leveraging transactions, separating definitions from instances, and utilizing explicit selection filters, developers can build fast, dependable plugins tailored for automated drafting pipelines.
When new designers join a team, they do not need to spend days copying files or configuring local paths. They simply connect to the AutoCAD Block Net path and instantly gain access to years of accumulated company assets. Step-by-Step Implementation of an AutoCAD Block Net
foreach (var br in db.ModelSpace.OfType<BlockReference>().UpgradeOpen()) Every drawing database contains a set of symbol tables
You must reference the core AutoCAD DLLs via NuGet or from your AutoCAD installation directory: Accoremgd.dll (Core engine management) Acdbmgd.dll (Database management) Acmgd.dll (Application and UI management)
public void ChangeDynamicProperty(BlockReference br, string propName, object newValue) if (br.IsDynamicBlock) DynamicBlockReferencePropertyCollection propCollection = br.DynamicBlockReferencePropertyCollection; foreach (DynamicBlockReferenceProperty prop in propCollection) if (prop.PropertyName.Equals(propName, System.StringComparison.OrdinalIgnoreCase) && !prop.ReadOnly) prop.Value = newValue; break; Use code with caution. Best Practices and Performance Optimization
An unmanaged network library quickly devolves into chaos. Implement these governance strategies to keep your system clean: Share public link The following C# example demonstrates
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In the AutoCAD database, Model Space and Paper Space are treated as special BlockTableRecord objects. Model Space is internally named *Model_Space .
This is the "handle" you use to place the block. Choose a logical corner or center point.