場景

Winform控制項-DevExpress18下載安裝註冊以及在VS中使用：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/100061243

DevExpress的TreeList怎樣設置數據源，從實例入手：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/102548490

在上面實現簡單的TreeList並設置數據源，顯示效果仍然不是想要的樹形結構的效果。

如果想實現如下這樣效果，還需要進行進一步的屬性設置。

註：

博客主頁：
https://blog.csdn.net/badao_liumang_qizhi
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實現

   /// 為樹控制項設置數據源
        /// </summary>
        /// <param name="treeList">樹控制項</param>
        /// <param name="data">數據對象</param>
        /// <param name="fieldName">顯示的欄位</param>
        /// <param name="keyFieldName">鍵欄位</param>
        /// <param name="parentFieldName">父級鍵欄位</param>
        public static void SetTreeListDataSource(DevExpress.XtraTreeList.TreeList treeList, List<DataTreeNode> data, string fieldName, string keyFieldName, string parentFieldName)
        {
            #region 設置節點圖標

            System.Windows.Forms.ImageList imgList = new System.Windows.Forms.ImageList();
            imgList.Images.AddRange(imgs);

            treeList.SelectImageList = imgList;

            //目錄展開
            treeList.AfterExpand -= treeList_AfterExpand;
            treeList.AfterExpand += treeList_AfterExpand;

            //目錄摺疊
            treeList.AfterCollapse -= treeList_AfterCollapse;
            treeList.AfterCollapse += treeList_AfterCollapse;

            //數據節點單擊，開啟整行選中
            treeList.MouseClick -= treeList_MouseClick;
            treeList.MouseClick += treeList_MouseClick;

            //數據節點雙擊選中
            treeList.MouseDoubleClick -= treeList_MouseDoubleClick;
            treeList.MouseDoubleClick += treeList_MouseDoubleClick;

            //焦點離開事件
            treeList.LostFocus -= treeList_LostFocus;
            treeList.LostFocus += treeList_LostFocus;


            #endregion

            #region 設置列頭、節點指示器面板、表格線樣式

            treeList.OptionsView.ShowColumns = false;             //隱藏列標頭
            treeList.OptionsView.ShowIndicator = false;           //隱藏節點指示器面板

            treeList.OptionsView.ShowHorzLines = false;           //隱藏水平表格線
            treeList.OptionsView.ShowVertLines = false;           //隱藏垂直表格線
            treeList.OptionsView.ShowIndentAsRowStyle = false;

            #endregion

            #region 初始禁用單元格選中，禁用整行選中

            treeList.OptionsView.ShowFocusedFrame = true;                               //設置顯示焦點框
            treeList.OptionsSelection.EnableAppearanceFocusedCell = false;              //禁用單元格選中
            treeList.OptionsSelection.EnableAppearanceFocusedRow = false;               //禁用正行選中
            //treeList.Appearance.FocusedRow.BackColor = System.Drawing.Color.Red;      //設置焦點行背景色

            #endregion

            #region 設置TreeList的展開摺疊按鈕樣式和樹線樣式

            treeList.OptionsView.ShowButtons = true;                  //顯示展開摺疊按鈕
            treeList.LookAndFeel.UseDefaultLookAndFeel = false;       //禁用預設外觀與感覺
            treeList.LookAndFeel.UseWindowsXPTheme = true;            //使用WindowsXP主題
            treeList.TreeLineStyle = DevExpress.XtraTreeList.LineStyle.Percent50;     //設置樹線的樣式

            #endregion

            #region 添加單列

            DevExpress.XtraTreeList.Columns.TreeListColumn colNode = new DevExpress.XtraTreeList.Columns.TreeListColumn();
            colNode.Name = String.Format("col{0}", fieldName);
            colNode.Caption = fieldName;
            colNode.FieldName = fieldName;
            colNode.VisibleIndex = 0;
            colNode.Visible = true;

            colNode.OptionsColumn.AllowEdit = false;                        //是否允許編輯
            colNode.OptionsColumn.AllowMove = false;                        //是否允許移動
            colNode.OptionsColumn.AllowMoveToCustomizationForm = false;     //是否允許移動至自定義窗體
            colNode.OptionsColumn.AllowSort = false;                        //是否允許排序
            colNode.OptionsColumn.FixedWidth = false;                       //是否固定列寬
            colNode.OptionsColumn.ReadOnly = true;                          //是否只讀
            colNode.OptionsColumn.ShowInCustomizationForm = true;           //移除列後是否允許在自定義窗體中顯示

            treeList.Columns.Clear();
            treeList.Columns.AddRange(new DevExpress.XtraTreeList.Columns.TreeListColumn[] { colNode });

            #endregion

            #region 綁定數據源

            treeList.KeyFieldName = keyFieldName;
            treeList.ParentFieldName = parentFieldName;
            treeList.DataSource = data;
            treeList.RefreshDataSource();

            #endregion

            #region 初始化圖標

            SetNodeImageIndex(treeList.Nodes.FirstOrDefault());

            #endregion
        }