Dev TreeList序号显示

具体忘了从哪里参考来的。

 private void treeDep_CustomDrawNodeIndicator(object sender, DevExpress.XtraTreeList.CustomDrawNodeIndicatorEventArgs e)
        {
            TreeList tr = sender as DevExpress.XtraTreeList.TreeList;
            IndicatorObjectInfoArgs args = e.ObjectArgs as IndicatorObjectInfoArgs;
            args.DisplayText = (tr.GetVisibleIndexByNode(e.Node) + 1).ToString();
        }