DevExpress官网

您可以使用ToolTipController控件，然后通过ToolTipController.GetActiveObjectInfo事件来设置ToolTip

关键代码：

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} (Column: {1}, Node ID: {2})", hit.Node[hit.Column],

                    hit.Column.VisibleIndex, hit.Node.Id);

                    e.Info = new DevExpress.Utils.ToolTipControlInfo(cellInfo, toolTip);

                }

          }

}

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