DevExpress Treelist自定义单元格，加注释和行序号。以上一节的列表为例，实现以下效果：预算大于110万的单元格突出显示，加上行序号以及注释，如下图：

添加行序号要用到CustomDrawNodeIndicator方法，要注意的是，取得的节点索引是从0开始的，所以要+1以便第一行从一开始算起。

private void treeList1_CustomDrawNodeIndicator(object sender, CustomDrawNodeIndicatorEventArgs e)
        {
            TreeList tree = sender as DevExpress.XtraTreeList.TreeList;
            tree.IndicatorWidth = 30;
            IndicatorObjectInfoArgs args = e.ObjectArgs as IndicatorObjectInfoArgs;
            args.DisplayText = (tree.GetVisibleIndexByNode(e.Node) + 1).ToString();
        }

若要添加单元格注释，则要用到toolTipController控件。将其拉入界面中，并将Treelist的 tooltipcontroller属性设置为刚才的控件名称，然后定义控件的GetActiveObjectInfo事件，本例显示了单元格的内容、列 和节点的索引：

private void toolTipController1_GetActiveObjectInfo(object sender, DevExpress.Utils.ToolTipControllerGetActiveObjectInfoEventArgs e)
        {
            if (e.SelectedControl is DevExpress.XtraTreeList.TreeList)
            {
                TreeList tree = (TreeList)e.SelectedControl;
                TreeListHitInfo hit = tree.CalcHitInfo(e.ControlMousePosition);

                if (hit.HitInfoType == HitInfoType.Cell)
                {
                    object cellInfo = new TreeListCellToolTipInfo(hit.Node,hit.Column,null);
                    string toolTip = string.Format("{0} (Colomn: {1}, Node ID: {2})", hit.Node[hit.Column],
                        hit.Column.VisibleIndex, hit.Node.Id);
                    e.Info = new DevExpress.Utils.ToolTipControlInfo(cellInfo,toolTip);
                }
            }
        }

最后，说一下自定义单元格，就是把符合条件的单元格按照定义的方式进行显示，例如本例是将预算大于110万的单元格背景变成粉色并且字体白色加粗显示。

private void treeList1_NodeCellStyle(object sender, GetCustomNodeCellStyleEventArgs e)
        {
            if (e.Column.FieldName != "Budget") return;
            if (Convert.ToInt32(e.Node.GetValue(e.Column.AbsoluteIndex)) > 1100000)
            {
                e.Appearance.BackColor = Color.FromArgb(80,255,0,255);
                e.Appearance.ForeColor = Color.White;
                e.Appearance.Font = new Font(e.Appearance.Font, FontStyle.Bold);
            }
        }