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通过TreeList.NodeCellStyle事件，可以对单元格外观进行自定义

关键代码：

private void treeList1_NodeCellStyle(object sender, DevExpress.XtraTreeList.GetCustomNodeCellStyleEventArgs e)

        {

            if (e.Column.FieldName != "BUDGET") return;

            if (Convert.ToInt32(e.Node.GetValue(e.Column.AbsoluteIndex)) > 500000)

            {

                e.Appearance.BackColor = Color.FromArgb(80, 255, 0, 255);

                e.Appearance.ForeColor = Color.White;

                e.Appearance.Font = new Font(e.Appearance.Font, FontStyle.Bold);

            }

     }

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