Hi!

In my application I have a navigation history (like web-browser). Each history step has his own set of data.
In UI I have a DataGridControl with TableView. When user navigates forward or back in navigation history, ItemSource of DataGridControl changes to another object.

I want to save the selection and scrolling offset. With selection I have no problem, but setting scroll offsets doesn't works.

My code:

private void ApplyData(DataLoaderResult dataLoaderResult)
{
  //.. some code skipped ...  
	
  DataGrid.ItemsSource = FDataView.PlainView;
  //.. some code skipped ...
  
  var scroll = (ScrollViewer)DataGrid.Template.FindName("PART_ScrollViewer", DataGrid);
	
  scroll.ScrollToHorizontalOffset(horizontalScrollOffset);
  scroll.ScrollToVerticalOffset(verticalScrollOffset);
}

horizontalScrollOffset and verticalScrollOffset values are non-zero but scroll offset don't changes

P.S. I use Xceed DataGrid v.3.1 Express

What you are doing is not wrong, but I found that I had to set the scroll offsets by dispatching the function call into another thread using a priority of Loaded (I think) as I don't have the code to hand.

When I tried your approach I too found that my values were ignored - I think that they are reset when the grid reloads itself.

If you still have problems let me know and I will post my code.

Yes,I still have this problem and don't know how to solve it.

Help me please! :)

"Thanks to all" :)

I have solved this problem by using the timer:

private void ApplyData(DataLoaderResult dataLoaderResult)
{
	// ... some code skipped ...
	
	DataGrid.ItemsSource = FDataView.PlainView;

	EnqueueDelayedSettingDataGridScroll();
}

private void EnqueueDelayedSettingDataGridScroll()
{
	DispatcherTimer timer = new DispatcherTimer {
		Interval = TimeSpan.FromMilliseconds(1)
	};
	timer.Tick += delegate(object sender, EventArgs args)
	              	{
	              		timer.Stop();
	              		SetDataGridScrollAndSelection();
	              	};
	timer.Start();
}

private void SetDataGridScrollAndSelection()
{
	if (FInitialDataGridParameters != null) {
		
	// ... some code skipped ...
    
		scroll.ScrollToHorizontalOffset(horizontalScrollOffset);
		scroll.ScrollToVerticalOffset(verticalScrollOffset);
	}
}

Sorry for the delay - have been away for long weekend. The code that I would use is similar to yours (just does not involve the Timer). It does need .NET 3.5 SP1 to use the Dispatcher code.

private void ApplyData(DataLoaderResult dataLoaderResult)
{
 //Where you currently get the offsets call this...
        GetAndSetScrollViwerOffsets(DispatcherPriority.Loaded);
 
 // ... some code skipped ...
 DataGrid.ItemsSource = FDataView.PlainView;
}

    internal void GetAndSetScrollViwerOffsets(DispatcherPriority dispatcherPriority)
    {
      double dVerticalOffset = 0.0;
      double dHorizontalOffset = 0.0;
      GetScrollViewerOffsets(ref dVerticalOffset, ref dHorizontalOffset);
      Dispatcher.BeginInvoke((Action)(() => SetScrollViewerOffsets(dVerticalOffset, dHorizontalOffset)), dispatcherPriority, null);
    }
   

    private void GetScrollViewerOffsets(ref double dVerticalOffset, ref double dHorizontalOffset)
    {
      dVerticalOffset = 0.0;
      dHorizontalOffset = 0.0;
      ScrollViewer sv = Template.FindName("PART_ScrollViewer", this) as ScrollViewer;
      if (sv != null)
      {
        dVerticalOffset = sv.VerticalOffset;
        dHorizontalOffset = sv.HorizontalOffset;
      }

    }

    private void SetScrollViewerOffsets(double dVerticalOffset, double dHorizontalOffset)
    {
      if (dVerticalOffset >= 0.0 || dHorizontalOffset >= 0.0)
      {
        ScrollViewer sv = Template.FindName("PART_ScrollViewer", this) as ScrollViewer;
        if (sv != null)
        {
          if (dVerticalOffset > sv.ScrollableHeight)
          {
            sv.ScrollToVerticalOffset(sv.ScrollableHeight);
          }
          else
          {
            sv.ScrollToVerticalOffset(dVerticalOffset);
          }
          if (dHorizontalOffset > sv.ScrollableWidth)
          {
            sv.ScrollToHorizontalOffset(sv.ScrollableWidth);
          }
          else
          {
            sv.ScrollToHorizontalOffset(dHorizontalOffset);
          }
        }
      }
    }