How to persist the vertical scroll position?

Sometimes you want to save the current vertical scroll position and then set that position back again, after a refresh of the bound source, for example.

You can do so (partly) as follows:

object topMostVisibleRowContext = null;

private void SaveScrollState_Click(object sender, RoutedEventArgs e)

{

// This is a very expensive method, with the search peformance in O(n(pow)2)

this.topMostVisibleRowContext = Extensions.GetFirstVisibleDataGridRow(this.ganttControl.GanttTable).DataContext;

}

private void LoadScrollState_Click(object sender, RoutedEventArgs e)

{

if (this.topMostVisibleRowContext != null)

{

this.ganttControl.GanttTable.SelectedItem = topMostVisibleRowContext;

this.ganttControl.GanttTable.ScrollIntoView(this.topMostVisibleRowContext, this.ganttControl.GanttTable.Columns[0]);

}

This will ensure that the prev top-most visible row is currently visible - but it doesn't make it the top row.

So, this doesn't fully implement the original requirement - only partly.