Dynamic block intersection with Line

[Frederick]

Hello guys,
I'm trying to do a intersection  dynamic block (name = "handrail") with user selected Line.

This dynamic block is made up of polylines only.

In the intersections points a need make a circles.

This is my code, but is not working with dynamic block, only with static block.
 

  public static void FindIntersection(List<ObjectId> polylineIds)
  {
      Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;

      PromptEntityOptions peo2 = new PromptEntityOptions("\nSelect a Line: ");
      peo2.SetRejectMessage("\nError, please select a Line");
      peo2.AddAllowedClass(typeof(Line), true);

      PromptEntityResult res2 = ed.GetEntity(peo2);
      if (res2.Status != PromptStatus.OK)
      {
          return;
      }

      ObjectId lineId = polylineIds[0];
      ObjectId line2Id = res2.ObjectId;

      Database db = Application.DocumentManager.MdiActiveDocument.Database;

      using (Transaction trans = db.TransactionManager.StartTransaction())
      {
          Polyline poly = trans.GetObject(lineId, OpenMode.ForRead) as Polyline;
          Line line = trans.GetObject(line2Id, OpenMode.ForRead) as Line;

          BlockTable bt = trans.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
          BlockTableRecord btr = trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;

          Line line2 = new Line();
          line2.StartPoint = poly.StartPoint;
          line2.EndPoint = poly.EndPoint;
          line2.ColorIndex = 1;

          btr.AppendEntity(line2);
          trans.AddNewlyCreatedDBObject(line2, true);

          Point3dCollection intersectionPoints = new Point3dCollection();
          line.IntersectWith(poly, Intersect.OnBothOperands, intersectionPoints, 0, 0);

          Point3d intersectionPoint = intersectionPoints[0];

          double radius = 25.0; // Průměr 50
          Circle circle = new Circle(intersectionPoint, Vector3d.ZAxis, radius);

          btr.AppendEntity(circle);
          trans.AddNewlyCreatedDBObject(circle, true);

          trans.Commit();

   
      }

  }


  [CommandMethod("Intersections")]
  public static void CountPolylinesInBlock()
  {
      var doc = Application.DocumentManager.MdiActiveDocument;
      var db = doc.Database;
      var ed = doc.Editor;


      string blockName = "Handrail";

     
      var polylineIds = new List<ObjectId>();

      using (Transaction tr = db.TransactionManager.StartTransaction())
      {
        
          var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);

          if (!bt.Has(blockName))
          {
              ed.WriteMessage($"\nBlok '{blockName}' not found.");
              return;
          }
         

       
          var blkRecId = bt[blockName];
          var blkRec = (BlockTableRecord)tr.GetObject(blkRecId, OpenMode.ForRead);


       
          foreach (ObjectId id in blkRec)
          {
              Entity ent = tr.GetObject(id, OpenMode.ForRead) as Entity;
              if (ent != null && ent is Polyline)
              {

                  polylineIds.Add(id);
              }
          }

    
          tr.Commit();
      }

      FindIntersection(polylineIds);
  }

[hosneyalaa]

Can you attached example drawing

[Frederick]

Here is dwg.

test.dwg

[SLW210]

This doesn't look like AutoCAD LISP, more like VB.Net or similar.

[Tharwat]

55 minutes ago, SLW210 said:

This doesn't look like AutoCAD LISP, more like VB.Net or similar.

It's C#