How to get parent of annotation using changed command in WPF Diagram?

In the WPF Diagram control, you can obtain the parent of annotation using the AnnotationChangedEventArgs provided by the AnnotationChangedCommand and AnnotationChangedEvent when an annotation is changed.

Code snippet:

//Using AnnotationChanged event.
//Diagram instance
SfDiagram diagram = new SfDiagram();
(diagram.Info as IGraphInfo).AnnotationChanged += diagram_AnnotationChanged;

/// <summary>
/// Method to execute AnnotationChanged event.
/// </summary>
/// <param name="sender">Sender of the event.</param>
/// <param name="args">Arguments of the event.</param>
private void diagram_AnnotationChanged(object sender, ChangeEventArgs<object, AnnotationChangedEventArgs> args)
{
   if (args.NewValue.OriginalSource != null)
   {
       //Getting parent element of the annotation when it is changed.
       var annotationParent = ((args.NewValue.OriginalSource as AnnotationEditor).Parent as AnnotationPanel).DataContext;
   }
}

//Using AnnotationChangedCommand
/// <summary>
/// Method to execute AnnotationChangedCommand.
/// </summary>
/// <param name="parameter">Event arguments.</param>
private void OnAnnotationChangedCommandExecute(object parameter)
{
   var args = parameter as ChangeEventArgs<object, AnnotationChangedEventArgs>;
   if (args.NewValue.OriginalSource != null)
   {
       //Getting parent element of the annotation when it is changed.
       var annotationParent = ((args.NewValue.OriginalSource as AnnotationEditor).Parent as AnnotationPanel).DataContext;
   }
} 

Conclusion

I hope you enjoyed learning about how to get parent of annotation using changed command in 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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