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:

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.