topic Create Associative Dimensions with .NET in .NET Forum

Create Associative Dimensions with .NET

danielmollerX5W2N — Tue, 03 Jun 2025 19:30:15 GMT

10 years have passed since the last question asked about this.

Is there any news about it?
I can create dimensions via .NET, in short, like this

AlignedDimension dimension = new AlignedDimension(); //set properties ... //... //... end set properties blockTableRecord.AppendEntity(dimension) transaction.AddNewlyCreatedDBObject(dimension, true)

How can I make this dimmension associative? Say associate it to the segment of a Polyline.
Either via setting properties, creating association objects or just calling commands from the editor...

Re: Create Associative Dimensions with .NET

daniel_cadext — Wed, 04 Jun 2025 00:02:03 GMT

You have to create a AcDbDimAssoc object. Here’s a sample in Python

def PyRxCmd_pydimassoc(): try: pt1 = Ge.Point3d(0, 0, 0) pt2 = Ge.Point3d(15, 0, 0) pt3 = Ge.Point3d(5, 5, 0) db = Db.curDb() model = Db.BlockTableRecord(db.modelSpaceId(), Db.OpenMode.kForWrite) line = Db.Line(pt1, pt2) line.setDatabaseDefaults() lineid = model.appendAcDbEntity(line) line.close() dim = Db.AlignedDimension(pt1, pt2, pt3) dim.setDatabaseDefaults() dimId = model.appendAcDbEntity(dim) dim.close() ref1 = Db.OsnapPointRef(pt1) ref1.setOsnapType(Db.OsnapType.kOsnapStart) ref1.setIdPath(lineid, Db.SubentType.kEdgeSubentType, 0) ref2 = Db.OsnapPointRef(pt2) ref2.setOsnapType(Db.OsnapType.kOsnapEnd) ref2.setIdPath(lineid, Db.SubentType.kEdgeSubentType, 0) dimAssoc = Db.DimAssoc() dimAssoc.setDimObjId(dimId) dimAssoc.setPointRef(Db.DimAssocPointType.kXline1Point, ref1) dimAssoc.setPointRef(Db.DimAssocPointType.kXline2Point, ref2) dimAssoc.updateDimension() dimAssoc.post(dimId) # or # Db.Core.postDimAssoc(dimId,dimAssoc) except Exception as err: traceback.print_exception(err) def PyRxCmd_pydimassocread(): try: res = Ed.Editor.entSel("\nPick a dim", Db.Dimension.desc()) if res[0] != Ed.PromptStatus.eOk: return # acdbGetDimAssocId assocId = Db.Core.getDimAssocId(res[1]) dimAssoc = Db.DimAssoc(assocId) # added dimAssoc.osnapPointRef so we don't need to cast in Python ref1 = dimAssoc.osnapPointRef(Db.DimAssocPointType.kXline1Point) ref2 = dimAssoc.osnapPointRef(Db.DimAssocPointType.kXline2Point) print(ref1.point(), ref2.point()) except Exception as err: traceback.print_exception(err) def PyRxCmd_pyremdimassoc(): try: res = Ed.Editor.entSel("\nPick a dim", Db.Dimension.desc()) if res[0] != Ed.PromptStatus.eOk: return # acdbGetDimAssocId assocId = Db.Core.getDimAssocId(res[1]) dimAssoc = Db.DimAssoc(assocId, Db.OpenMode.ForWrite) dimAssoc.removeAssociativity() except Exception as err: traceback.print_exception(err)

Re: Create Associative Dimensions with .NET

danielmollerX5W2N — Wed, 04 Jun 2025 17:06:22 GMT

This is not .NET, though. This class is not available.

Re: Create Associative Dimensions with .NET

daniel_cadext — Wed, 04 Jun 2025 22:24:05 GMT

Holycow! Very sorry about that, I just assumed AcDbDimAssoc was wrapped in .NET.

I see AssocDependency classes, not sure if that’s related

Re: Create Associative Dimensions with .NET

khodulieucuong — Mon, 09 Jun 2025 10:01:40 GMT

var dim = tr.GetObject(id, OpenMode.ForWrite) as Dimension; var dic = dim.ExtensionDictionary; if (!dic.IsNull) { var extDict = tr.GetObject(dim.ExtensionDictionary, OpenMode.ForWrite) as DBDictionary; var dimAssocId = extDict.GetAt("ACAD_DIMASSOC"); if(extDict.Contains(dimAssocId)) { extDict.Remove(dimAssocId); // remove association } }

Re: Create Associative Dimensions with .NET

khodulieucuong — Mon, 09 Jun 2025 10:06:45 GMT

AcadApp.SetSystemVariable("DIMASSOC", 1); // associate dimension