Code

        private void DesignDiagram_LinkCreated(object sender, LinkEventArgs e)
        {
            if (e.Link != null)
            {
                if (e.Link.GetType().Name.Equals("EvLinkWithParam"))
                {
                   // if (e.Link as EvLinkWithParam != null)
                    {
                        (e.Link as EvLinkWithParam).EvDataProvider = SwitchModule.Instance.DataSourceName;
                        e.Link.HeadShape = ArrowHeads.None;
                        e.Link.AllowMoveEnd = true;
                        e.Link.AllowMoveStart = true;
                        e.Link.AutoRoute = false;
                        e.Link.Dynamic = false;
                        e.Link.SegmentCount = 3;
                        e.Link.IgnoreLayout = true;
                        e.Link.HeadShapeSize = 8;
                        e.Link.StrokeThickness = 1;
                        ConnectToNearbyNode(e.Link);
                    }
                }
            }
        }

        private void ConnectToNearbyNode(DiagramLink link)
        {
            var origin = DesignDiagram.Nodes.OrderBy(n =>
                Utilities.Distance(n.GetCenter(), link.StartPoint)).FirstOrDefault();

            if (origin != null)
            {
                var distance = Utilities.Distance(origin.GetCenter(), link.StartPoint);
                if (distance < 1)
                {
                    link.Origin = origin;
                    link.Route();
                }
            }
            var destination = DesignDiagram.Nodes.Where(n => !n.Equals(origin)).OrderBy(n =>
                Utilities.Distance(n.GetCenter(), link.EndPoint)).FirstOrDefault();

            if (destination != null)
            {
                var distance = Utilities.Distance(destination.GetCenter(), link.EndPoint);
                if (distance < 1)
                {
                    link.Destination = destination;
                    link.Route();
                }
            }
        }