Revit MEP API找到連接器連接的連接器

通過conn.AllRefs;可以找到與之連接的連接器。
[TransactionAttribute(Autodesk.Revit.Attributes.TransactionMode.Manual)]
  cmdConnected : IExternalCommand
{
     Result Execute(ExternalCommandData commandData,   messages, ElementSet elements)
    {
        UIApplication app = commandData.Application;
        Document doc = app.ActiveUIDocument.Document;
        Selection sel = app.ActiveUIDocument.Selection;

        Transaction ts =  Transaction(doc, );
        ts.Start();

        Reference refDuct = sel.PickObject(ObjectType.Element, );
        Duct duct = doc.GetElement(refDuct)  Duct;
        ConnectorSetIterator csi = duct.ConnectorManager.Connectors.ForwardIterator();
         (csi.MoveNext())
        {
            Connector conn = csi.Current  Connector;
             (conn.IsConnected == )            {
                ConnectorSet connectorSet = conn.AllRefs;                ConnectorSetIterator csiChild = connectorSet.ForwardIterator();
                 (csiChild.MoveNext())
                {
                    Connector connected = csiChild.Current  Connector;
                     ( != connected && connected.Owner.UniqueId != conn.Owner.UniqueId)
                    {
                                                 (connected.ConnectorType == ConnectorType.End ||
                            connected.ConnectorType == ConnectorType.Curve ||
                            connected.ConnectorType == ConnectorType.Physical)
                        {
                                                         (connected.Owner  FamilyInstance)
                            {
                                TaskDialog.Show(, connected.Owner.Name);
                            }
                        }
                    }
                }
            }
        }

        ts.Commit();

         Result.Succeeded;
    }
}url:http://greatverve.cnblogs.com/p/revit-mep-api-AllRefs.html