C#/WPF - Get ScrollViewer scroll position?

Question

Okay, so, everyone knows how to set the scroll position of a ScrollViewer. Entire essays and blog entries have been written about ScrollViewer.ScrollToVerticalOffset() , and there are a good few hundred questions with answers about it here.

So, I enter:

myScrollViewer.ScrollToVerticalOffset(280);

... and it so kindly scrolls to that location.

The question is, what property now contains 280 , so I can retrieve it later?

(Hint: myScrollViewer.VerticalOffset and ContentVerticalOffset are both 0; myScrollViewer.ScrollInfo just plain doesn't exist.)

EDIT: Apparently I need a more detailed demonstration.

private void btnTest_Click(object sender, RoutedEventArgs e) {
  double scrollTarget = 280;
  MessageBox.Show("Target: " + scrollTarget.ToString());
  myScrollViewer.ScrollToVerticalOffset(scrollTarget);
  MessageBox.Show("Now: " + myScrollViewer.VerticalOffset);
}

I must reiterate that this does scroll as intended. Goes right exactly where I want it to. But, myScrollViewer.VerticalOffset is set at 0.

Answer 1

The solution is to manually call myScrollViewer.UpdateLayout() after myScrollViewer.ScrollToVerticalOffset() . Then, myScrollViewer.VerticalOffset will have the expected value.

Answer 2

在触发LayoutUpdated事件后，确保您的VerticalScrollBarVisibility =“Visible”和VerticalScrollOffset将为280。

Answer 3

I think you are calling the myscrollViewer in the constructor of the window.

You can call them when you click a button or in loaded method for the window, so that the value gets updated in vertical offset values. That is, these value gets updated after you initialize your window!