[DevExpress]TreeList 显示行号

    private void treeList_CustomDrawNodeIndicator(object sender, DevExpress.XtraTreeList.CustomDrawNodeIndicatorEventArgs e)        {            DevExpress.XtraTreeList.TreeList tmpTree = sender as DevExpress.XtraTreeList.TreeList;            DevExpress.Utils.Drawing.IndicatorObjectInfoArgs args = e.ObjectArgs as DevExpress.Utils.Drawing.IndicatorObjectInfoArgs;            if (args != null)            {                int rowNum = tmpTree.GetVisibleIndexByNode(e.Node) + 1;        this.treeList.IndicatorWidth = rowNum.ToString().Length * 10 + 10;                args.DisplayText = rowNum.ToString();            }        }