/// <summary>
/// 设置图片节点的背景色
/// 说明：在CustomDrawNodeImages事件中使用
/// </summary>
/// <param name="tree">TreeList</param>
/// <param name="e">CustomDrawNodeImagesEventArgs</param>
/// <param name="builderBackColorHandler">委托</param>
public static void CustomImageNodeBackColor(this TreeList tree, CustomDrawNodeImagesEventArgs e, Func<TreeListNode, Color> builderBackColorHandler)
{
  TreeListNode _node = e.Node;
  Color _backColor = builderBackColorHandler(_node);
  e.Graphics.FillRectangle(new SolidBrush(_backColor), e.Bounds);
}

private void tlLHData_CustomDrawNodeImages(object sender, CustomDrawNodeImagesEventArgs e)
{
  try
  {
 tlLHData.CustomImageNodeBackColor(e, node =>
 {
   string _cabId = node.GetKeyID();
   CCabInfo _cabInfo = LHDBHelper.GetCabInfo(_cabId);
   if (_cabInfo != null)
   {
 return _cabInfo.CtuOnlineStatus == 1 ? Color.White : Color.LightGray;
   }
   return Color.White;
 });
  }
  catch (Exception)
  {

  }
}