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使用treeList.CustomDrawNodeIndicator事件

关键代码：

private void treeList1_CustomDrawNodeIndicator(object sender, DevExpress.XtraTreeList.CustomDrawNodeIndicatorEventArgs e)

        {

            TreeList tree = sender as DevExpress.XtraTreeList.TreeList;

            IndicatorObjectInfoArgs args = e.ObjectArgs as IndicatorObjectInfoArgs;

            args.DisplayText = (tree.GetVisibleIndexByNode(e.Node) + 1).ToString();

        }

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