接著再介紹一下DevExpress Treelist自定義單元格，加注釋和行序號(hào)。以上一節(jié)的列表為例，實(shí)現(xiàn)以下效果：預(yù)算大于110萬的單元格突出顯示，加上行序號(hào)以及注釋，如下圖：

添加行序號(hào)要用到CustomDrawNodeIndicator方法，要注意的是，取得的節(jié)點(diǎn)索引是從0開始的，所以要+1以便第一行從一開始算起。

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();
        }

若要添加單元格注釋，則要用到toolTipController控件。將其拉入界面中，并將Treelist的tooltipcontroller屬性設(shè)置為剛才的控件名稱，然后定義控件的GetActiveObjectInfo事件，本例顯示了單元格的內(nèi)容、列和節(jié)點(diǎn)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，說一下自定義單元格，就是把符合條件的單元格按照定義的方式進(jìn)行顯示，例如本例是將預(yù)算大于110萬的單元格背景變成粉色并且字體白色加粗顯示。

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);
            }
        }

慧都學(xué)院2017全新DevExpress線下研修班火熱報(bào)名中！