How to select a connector when the mouse hovers over a node port that is connected by the connector in the WPF Diagram (SfDiagram)?

In the WPF Diagram, you can select a connector when the mouse hovers over a node port that is connected by the connector using the NodePort_MouseEnter and NodePort_MouseLeave events. In the NodePort_MouseEnter event, set the Tool to SingleSelect and enable the Connector selection by setting the IsSelected property to true. In the NodePort_MouseLeave event, reset the Tool to MultiSelect to restore the default selection behavior. We have provided the code example for how to achieve this.

Code Snippet:

private void NodePort_MouseEnter(object sender, MouseEventArgs e)
{
   if (e.Source is NodePort)
   {
       if ((e.Source as NodePort).DataContext is NodePortViewModel)
       {
           //View the model of the node port
           var nodePortVM = (e.Source as NodePort).DataContext as NodePortViewModel;

           //Checking if there are any connectors in the port
           if ((nodePortVM.Info as INodePortInfo).Connectors !=null && (nodePortVM.Info as INodePortInfo).Connectors.Any())
           {

               //Setting tool as single select to avoid new connector creation from node port.
               diagram.Tool = Tool.SingleSelect;

               //node of the port
               var parentNode = nodePortVM.Node as NodeViewModel;

               if (!parentNode.IsSelected)
               {
                   //Clearing selections of other elements.
                   ((diagram.SelectedItems as SelectorViewModel).Nodes as ObservableCollection<object>).Clear();

                   ((diagram.SelectedItems as SelectorViewModel).Connectors as ObservableCollection<object>).Clear();

                   //connector list of port
                   IEnumerable<object> connectorsList = (nodePortVM.Info as INodePortInfo).Connectors.ToList();
                   var connector = connectorsList.FirstOrDefault() as ConnectorViewModel;

                   //select the connector of the port.
                   if (connector != null)
                       connector.IsSelected = true;
               }
           }
       }
   }
}


//Resetting the tool as multiselect on mouse leave.
private void NodePort_MouseLeave(object sender, MouseEventArgs e)
{
   diagram.Tool = Tool.MultipleSelect;
} 

Conclusion
I hope you enjoyed learning about how to select a connector when the mouse hovers over a node port that is connected by the connector in the WPF Diagram
You can refer to our WPF Diagram feature tour page to learn about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications.

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