/// <summary> /// Changes the color of the edges for each ring. /// </summary> /// <param name="ring">[in] Ring object.</param> /// <returns> /// Returns true if successful. /// </returns> private bool HighLightRingEdges(Ring ring) { // Show how to get 1/2 edges in the Ring. HalfEdgeCollection edgeCollection = ring.GetEdges(); using (Transaction trans = Application.DocumentManager.MdiActiveDocument.TransactionManager.StartTransaction()) { // Loops through and highlights all the edges int edgeIndex = 0; foreach (HalfEdge halfEdge in edgeCollection) { FullEdge fullEdge = halfEdge.FullEdge; ObjectId objId = fullEdge.Entity; Entity entity = trans.GetObject(objId, Autodesk.AutoCAD.DatabaseServices.OpenMode.ForWrite, false) as Entity; if (null != entity) entity.ColorIndex = edgeIndex + 1; edgeIndex = edgeIndex + 1; } trans.Commit(); } return true; }