C# 排序后是否将滚动条重置到树状视图的顶部？

我有一个相当大的树结构，每当用户添加或删除子节点时，树都会重新排序。这一切都很好，但我的问题是：排序后，滚动条会自动重置到树的顶部。我想让滚动条保持（或返回）刚刚添加或删除节点的位置，这样用户就不必每次添加或删除内容时都向下滚动并查找父节点

一段时间以来，我一直在想办法做到这一点，但运气不好。有人有什么建议吗

以下是我用于删除子节点的方法（如果有帮助）：

private void RemoveFromCategoryEvent(object sender, EventArgs e)
{
  SuspendLayout();

  if (treeViewCategories.SelectedNode != null)
  {
    TreeNode treeNode = treeViewCategories.SelectedNode;
    TreeNode parentNode = treeNode.Parent;
    if ((settingGroup != null) && (settingGroup.GroupRootCategory != null)
        && (settingGroup.GroupRootCategory.Settings != null) && (treeNode.Tag is ISetting)
        && (parentNode.Tag is IDeviceSettingCategory))
    {
      ISetting currentSetting = treeNode.Tag as ISetting;
      (parentNode.Tag as IDeviceSettingCategory).Settings.Remove(currentSetting);
      treeNode.Remove();

      settingGroup.GroupRootCategory.Settings.Add(currentSetting);
      TreeNode settingNode = rootCategoryNode.Nodes.Add(currentSetting.ShortName);
      settingNode.Tag = currentSetting;

      settingNode.ImageIndex = Utilities.SettingCategoryChildImage;
      settingNode.SelectedImageIndex = Utilities.SettingCategoryChildImage;

      treeViewCategories.Sort(); //scrollbar reset happens here
    }
  }

  ResumeLayout();
}

---

您可以使用p/Invoke获取当前滚动位置，保存它，然后在排序后恢复它

您将需要以下API调用：

[DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
public static extern int GetScrollPos(int hWnd, int nBar);

[DllImport("user32.dll")]
static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool bRedraw);

private const int SB_HORZ = 0x0;
private const int SB_VERT = 0x1;

private Point GetTreeViewScrollPos(TreeView treeView)
{
    return new Point(
        GetScrollPos((int)treeView.Handle, SB_HORZ), 
        GetScrollPos((int)treeView.Handle, SB_VERT));
}

private void SetTreeViewScrollPos(TreeView treeView, Point scrollPosition)
{
    SetScrollPos((IntPtr)treeView.Handle, SB_HORZ, scrollPosition.X, true);
    SetScrollPos((IntPtr)treeView.Handle, SB_VERT, scrollPosition.Y, true); 
}

获取当前位置：

[DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
public static extern int GetScrollPos(int hWnd, int nBar);

[DllImport("user32.dll")]
static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool bRedraw);

private const int SB_HORZ = 0x0;
private const int SB_VERT = 0x1;

private Point GetTreeViewScrollPos(TreeView treeView)
{
    return new Point(
        GetScrollPos((int)treeView.Handle, SB_HORZ), 
        GetScrollPos((int)treeView.Handle, SB_VERT));
}

private void SetTreeViewScrollPos(TreeView treeView, Point scrollPosition)
{
    SetScrollPos((IntPtr)treeView.Handle, SB_HORZ, scrollPosition.X, true);
    SetScrollPos((IntPtr)treeView.Handle, SB_VERT, scrollPosition.Y, true); 
}

设置位置：

[DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
public static extern int GetScrollPos(int hWnd, int nBar);

[DllImport("user32.dll")]
static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool bRedraw);

private const int SB_HORZ = 0x0;
private const int SB_VERT = 0x1;

private Point GetTreeViewScrollPos(TreeView treeView)
{
    return new Point(
        GetScrollPos((int)treeView.Handle, SB_HORZ), 
        GetScrollPos((int)treeView.Handle, SB_VERT));
}

private void SetTreeViewScrollPos(TreeView treeView, Point scrollPosition)
{
    SetScrollPos((IntPtr)treeView.Handle, SB_HORZ, scrollPosition.X, true);
    SetScrollPos((IntPtr)treeView.Handle, SB_VERT, scrollPosition.Y, true); 
}

---

回答得很好。这就成功了。非常感谢你，布拉德利！：）