Check if an annotation has changed in UWP
There are several events you can subscribe to in order to be informed of changes to annotations:
AnnotationsCreated
AnnotationsDeleted
AnnotationsUpdated
OnAnnotationPresetUpdate
OnAnnotationSelectionChanged
OnAnnotationPressed
IsEditableAnnotation
OnAnnotationsWillChange
Here’s how you can add a handler to be informed of deleted annotations:
{ // After the PDF has been loaded. pdfView.Document.AnnotationsDeleted += OnAnnotationsDeleted;}
private void OnAnnotationsDeleted(object sender, IList<IAnnotation> annotations){ foreach (var annotation in annotations) { Debug.WriteLine($"OnAnnotationsDeleted: {annotation.Id}"); }}
You can find other examples and read more about events in our events guide.