I have a listview whose contents are constantly being refreshed.  When a
refresh occurs, I delete all the items and add back.  I want to maintain the
scroll position before deleting all the items, and then want to restore it
once the items are added back.

I'm using P/Invoke Get/SetScrollInfo to get and restore the scroll
information.  GetScrollInfo is working fine -  it returns expected
information.  SetScrollInfo has no effect - the scroll positions are
unchanged (both horz and vert are 0).

I also tried Get/SetScrollPos - no luck there, either.

Is this the correct way to do this?  Anyone know what might be wrong?

Here's some of my code:

 private void RefreshList()
 {
  User32.SCROLLINFO hsi = User32.GetScrollInfo((uint)
MyListView.Handle.ToInt32(), Constants.SB_HORZ);
  User32.SCROLLINFO vsi = User32.GetScrollInfo((uint)
MyListView.Handle.ToInt32(), Constants.SB_VERT);

  MyListView.BeginUpdate();

  MyListView.Items.Clear();

  // Add new items here...

  User32.SetScrollInfo((uint)MyListView.Handle.ToInt32(),
Constants.SB_HORZ, false, hsi);
  User32.SetScrollInfo((uint)MyListView.Handle.ToInt32(),
Constants.SB_VERT, false, vsi);

  MyListView.EndUpdate();
 }

public class Constants
{
 public const int SB_HORZ = 0;
 public const int SB_VERT = 1;
 public const int SB_CTL = 2;
 public const int SB_BOTH = 4;

 public const int SIF_RANGE =  0x0001;
 public const int SIF_PAGE =  0x0002;
 public const int SIF_POS =  0x0004;
 public const int SIF_DISABLENOSCROLL = 0x0008;
 public const int SIF_TRACKPOS = 0x0010;
 public const int SIF_ALL = (SIF_RANGE | SIF_PAGE | SIF_POS |
SIF_TRACKPOS);
}

public class User32
{
 [StructLayout(LayoutKind.Sequential)]
 public struct SCROLLINFO
 {
  public UInt32 cbSize;
  public UInt32 fMask;
  public Int32 nMin;
  public Int32 nMax;
  public UInt32 nPage;
  public Int32 nPos;
  public Int32 nTrackPos;
 }

 [DllImport("user32.dll", EntryPoint = "GetScrollInfo", SetLastError =
true)]
 private static extern int GetScrollInfoWnd(uint hWnd, int nBar, ref
SCROLLINFO si);

 public static SCROLLINFO GetScrollInfo(uint hWnd, int nBar)
 {
  SCROLLINFO si = new SCROLLINFO();

  si.cbSize = (uint) System.Runtime.InteropServices.Marshal.SizeOf(si);
  si.fMask = Constants.SIF_ALL;

  // also tried si.fMask = Constants.SIF_PAGE | Constants.SIF_POS |
Constants.SIF_RANGE

  GetScrollInfoWnd(hWnd, nBar, ref si);       // returns correct data

  return si;
 }

 [DllImport("user32.dll", EntryPoint = "SetScrollInfo", SetLastError =
true)]
 private static extern int SetScrollInfoWnd(uint hWnd, int nBar, bool
bRedraw, ref SCROLLINFO si);

 public static int SetScrollInfo(uint hWnd, int nBar, bool bRedraw,
SCROLLINFO si)
 {
  int rc = SetScrollInfoWnd(hWnd, nBar, bRedraw, ref si);

  return rc;  // return is 0 - presumably previous scroll position
 }
}

Thanks