场景

Winform控件-DevExpress18下载安装注册以及在VS中使用：

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

DevExpress的TreeList怎样设置数据源，从实例入手：

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

在上面实现简单的TreeList并设置数据源，显示效果仍然不是想要的树形结构的效果。

如果想实现如下这样效果，还需要进行进一步的属性设置。

注：

博客主页：
https://blog.csdn.net/badao_liumang_qizhi
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实现

   /// 为树控件设置数据源
        /// </summary>
        /// <param name="treeList">树控件</param>
        /// <param name="data">数据对象</param>
        /// <param name="fieldName">显示的字段</param>
        /// <param name="keyFieldName">键字段</param>
        /// <param name="parentFieldName">父级键字段</param>
        public static void SetTreeListDataSource(DevExpress.XtraTreeList.TreeList treeList, List<DataTreeNode> data, string fieldName, string keyFieldName, string parentFieldName)
        {
            #region 设置节点图标

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

            treeList.SelectImageList = imgList;

            //目录展开
            treeList.AfterExpand -= treeList_AfterExpand;
            treeList.AfterExpand += treeList_AfterExpand;

            //目录折叠
            treeList.AfterCollapse -= treeList_AfterCollapse;
            treeList.AfterCollapse += treeList_AfterCollapse;

            //数据节点单击，开启整行选中
            treeList.MouseClick -= treeList_MouseClick;
            treeList.MouseClick += treeList_MouseClick;

            //数据节点双击选中
            treeList.MouseDoubleClick -= treeList_MouseDoubleClick;
            treeList.MouseDoubleClick += treeList_MouseDoubleClick;

            //焦点离开事件
            treeList.LostFocus -= treeList_LostFocus;
            treeList.LostFocus += treeList_LostFocus;


            #endregion

            #region 设置列头、节点指示器面板、表格线样式

            treeList.OptionsView.ShowColumns = false;             //隐藏列标头
            treeList.OptionsView.ShowIndicator = false;           //隐藏节点指示器面板

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

            #endregion

            #region 初始禁用单元格选中，禁用整行选中

            treeList.OptionsView.ShowFocusedFrame = true;                               //设置显示焦点框
            treeList.OptionsSelection.EnableAppearanceFocusedCell = false;              //禁用单元格选中
            treeList.OptionsSelection.EnableAppearanceFocusedRow = false;               //禁用正行选中
            //treeList.Appearance.FocusedRow.BackColor = System.Drawing.Color.Red;      //设置焦点行背景色

            #endregion

            #region 设置TreeList的展开折叠按钮样式和树线样式

            treeList.OptionsView.ShowButtons = true;                  //显示展开折叠按钮
            treeList.LookAndFeel.UseDefaultLookAndFeel = false;       //禁用默认外观与感觉
            treeList.LookAndFeel.UseWindowsXPTheme = true;            //使用WindowsXP主题
            treeList.TreeLineStyle = DevExpress.XtraTreeList.LineStyle.Percent50;     //设置树线的样式

            #endregion

            #region 添加单列

            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;                        //是否允许编辑
            colNode.OptionsColumn.AllowMove = false;                        //是否允许移动
            colNode.OptionsColumn.AllowMoveToCustomizationForm = false;     //是否允许移动至自定义窗体
            colNode.OptionsColumn.AllowSort = false;                        //是否允许排序
            colNode.OptionsColumn.FixedWidth = false;                       //是否固定列宽
            colNode.OptionsColumn.ReadOnly = true;                          //是否只读
            colNode.OptionsColumn.ShowInCustomizationForm = true;           //移除列后是否允许在自定义窗体中显示

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

            #endregion

            #region 绑定数据源

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

            #endregion

            #region 初始化图标

            SetNodeImageIndex(treeList.Nodes.FirstOrDefault());

            #endregion
        }