本文实例展示了DevExpress实现自定义TreeListNode的Tooltip的方法，具体方法如下所示：

主要功能代码如下：

/// <summary> /// 为节点提供Tooltip /// 说明： /// 1.设置tree.ToolTipController属性 /// 2.ToolTipController的GetActiveObjectInfo事件中使用 /// 3.举例 /// tlLHData.CustomNodeTooltip(e, node => ///{ /// string _cabId = node.GetKeyID(); /// CCabInfo _cabinfo = LHDBHelper.GetCabInfo(_cabId); /// if (_cabinfo != null) /// { /// return string.Format("核对时间:{0}rn在线情况:{1}rn最后一次活跃时间:{2}rn", /// _cabinfo.ChkDataTime, /// _cabinfo.CtuOnlineStatus == 1 "未上线", /// _cabinfo.LastAliveTime); /// } /// return string.Empty; ///}); /// </summary> /// <param name="tree">TreeList</param> /// <param name="e">ToolTipControllerGetActiveObjectInfoEventArgs</param> /// <param name="builderNodeTooltipHandler">委托</param> public static void CustomNodeTooltip(this TreeList tree, ToolTipControllerGetActiveObjectInfoEventArgs e, Func<TreeListNode, string> builderNodeTooltipHandler) { if (e.SelectedControl is DevExpress.XtraTreeList.TreeList) { TreeList _tree = (TreeList)e.SelectedControl; TreeListHitInfo _hit = _tree.CalcHitInfo(e.ControlMousePosition); if (_hit.HitInfoType == HitInfoType.Cell) { TreeListViewInfo _viewInfo = _tree.ViewInfo; RowInfo _rowInfo = _viewInfo.GetRowInfoByPoint(e.ControlMousePosition); CellInfo _cellInfo = _rowInfo.Cells[_hit.Column.VisibleIndex] as CellInfo; EditHitInfo _editHitInfo = _cellInfo.EditorViewInfo.CalcHitInfo(e.ControlMousePosition); if (_editHitInfo.HitTest == EditHitTest.MaskBox) { string _toolTip = builderNodeTooltipHandler(_hit.Node); if (!string.IsNullOrEmpty(_toolTip)) e.Info = new ToolTipControlInfo(_cellInfo, _toolTip); } } } }

代码运行效果如下：