topic Re: Get the Associated Leader from BlockReference in .NET Forum

Get the Associated Leader from BlockReference

Gepaha — Tue, 03 Mar 2020 19:21:53 GMT

This may seem like a stupid question but I found no solution in the research I did.
I can associate a Block with a leader like:

var doc = Application.DocumentManager.MdiActiveDocument; var db = doc.Database; using (Transaction tr = db.TransactionManager.StartTransaction()) { var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead); var blkId = bt["Circle"]; var blkref = new BlockReference(new Point3d(0.5, 4, 0), blkId); var ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite); ms.AppendEntity(blkref); tr.AddNewlyCreatedDBObject(blkref, true); var ldr = new Leader(); ldr.AppendVertex(new Point3d(0, 0, 0)); ldr.AppendVertex(new Point3d(0, 4, 0)); ms.AppendEntity(ldr); tr.AddNewlyCreatedDBObject(ldr, true); // associate the block to the leader ldr.Annotation = blkref.ObjectId; tr.Commit() }

As I get the opposite? I have the block reference and want the leader associated with it.

Thanks in advance.

Re: Get the Associated Leader from BlockReference

ActivistInvestor — Wed, 04 Mar 2020 08:31:43 GMT

Since block references do not store information about objects that reference them the only way you can do that is by searching all leaders in the same space for the one whose Annotation property contains the ObjectId of the block reference.

Re: Get the Associated Leader from BlockReference

Gepaha — Wed, 04 Mar 2020 11:00:59 GMT

Thank you very much for that answer.
I thought there might be a hidden method or property that I didn't know about.

Re: Get the Associated Leader from BlockReference

Gepaha — Fri, 16 Apr 2021 14:22:15 GMT

Since using the .NET API it is not possible to get Leader associated with BlockReference, I am looking for alternatives.

It looks like the Leader is stored with a soft pointer in some dictionary.

How is it possible to obtain the Leader ObjectId associated with the BlockReference directly, without having to go through the entire database?

BlockRefrence with Leader Associated

If anyone can help I am grateful.

Re: Get the Associated Leader from BlockReference

Gepaha — Mon, 19 Apr 2021 11:09:40 GMT

Someone to help?

Re: Get the Associated Leader from BlockReference

Gepaha — Tue, 13 Jul 2021 17:30:09 GMT

I have tried several ways to get the Leader associated with the BlockReference and I have not been successful.

I'm trying to avoid runs through the entire database.

Somewhere the block stores the associated Leader information.

Can anyone help?