ScrollViewer.ChangeView何时会失败？

Question

ScrollViewer.ChangeView doesn't always work. When it doesn't - it returns false ( MSDN ).

What are the conditions for that happening?

EDIT

Most methods either work or throw an exception. This one has a return value. This means there are conditions where it fails (and returns false ). What are those conditions?

EDIT 2 (after awarding the bounty)

I awarded the bounty so as not to waste the reputation points. I'm still looking for THE answer. (Also, the answer was written before my edit to the question.)

Answer 1

The return value of ScrollViewer.ChangeView signals whether the view changes ( true ) or not ( false ) .

The most obvious reason why the view may not change after a ChangeView call is because it was already displaying the requested horizontal and/or vertical offsets and/or zoom factor before the call.