ConnectedWith.cs

public static List<Element> GetElementConnectedWith(this Element e)
        {
            List<Element> elements = new List<Element>();
            List<Connector> connectors = e.GetConnectors();
            if (connectors == null) return elements;
            if (connectors.Count == 0) return elements;
            elements = GetElementConnectedWith(connectors);
            return elements;
        }
 public static List<Element> GetElementConnectedWith(this List<Connector> connectors)
        {
            List<Element> elements = new List<Element>();
            foreach (Connector connector in connectors)
            {
                if (connector.IsConnected)
                {
                    List<Element> nextElement = connector.GetElementsConnected();
                    nextElement.ForEach(delegate (Element ele) { elements.Add(ele); });
                }
            }
            return elements;
        }
 public static List<Element> GetElementsConnected(this Connector conn)
        {
            List<Element> elements = new List<Element>();
            ConnectorSetIterator connectorSetIterator = conn.AllRefs.ForwardIterator();
            while (connectorSetIterator.MoveNext())
            {
                Connector connref = connectorSetIterator.Current as Connector;
                Element elem = connref.Owner;
                if (elem != null)
                {
                    elements.Add(elem);
                }
            }

            return elements;
        }