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SfPdfViewer : NullReferenceException when call Unload

Hi 

I have to come back to this problem, signaled with this ticket

https://www.syncfusion.com/feedback/19103/nullreferenceexception-when-call-unload
but actually in "Declined - Cannot Reproduce" state.

 

Now I am able to reproduce it.

Occurs only on UWP, iOS and Android works as expected.


Please run the attached solution that I made from your sample.

  1. click on the "Go to pdf page" button
  2. press the back button at the top left


The application crashes with the exception: 
System.NullReferenceException


The stack trace says:

   in Syncfusion.SfPdfViewer.XForms.UWP.SfPdfViewerControl.ScrollToPage (Int32 pageNumber)

   in Syncfusion.SfPdfViewer.XForms.UWP.PdfViewerDependencyServices.ScrolltoPage (Object nativeObject, Int32 pageNumber)

   in Syncfusion.SfPdfViewer.XForms.SfPdfViewer.OnPageNumberChanged (BindableObject bindable, Object oldValue, Object newValue)

   in Xamarin.Forms.BindableObject.SetValueActual (BindableProperty property, BindablePropertyContext context, Object value, Boolean currentlyApplying, SetValueFlags attributes, Boolean silent)

   in Xamarin.Forms.BindableObject.SetValueCore (BindableProperty property, Object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes)

   in Xamarin.Forms.BindableObject.SetValue (BindableProperty property, Object value, Boolean fromStyle, Boolean checkAccess)

   in Syncfusion.SfPdfViewer.XForms.SfPdfViewer.set_PageNumber (Int32 value)

   in Syncfusion.SfPdfViewer.XForms.SfPdfViewer.Unload ()

   in GettingStarted.PdfPage.OnDisappearing () in C: \ Users \ info \ Downloads \ GettingStarted-1029745208 \ GettingStarted \ GettingStarted \ PdfPage.xaml.cs: line 51


Thanks,
Walter