TreeList 的 增加、删除节点-----DevExpress

  private void FrmDictionaryManaged_Load(object sender, EventArgs e)
        {
            // treeList1.DataSource= CreateDataTable();

            treeList2.DataSource = CreateTreeList();
            // 绑定TreeList控件到数据源
            treeList1.DataSource = GetData();
            treeList1.KeyFieldName = "ID";
            treeList1.ParentFieldName = "ParentID";
           
            this.treeList1.Columns[1].Caption = @"字典测试";//树的名称

            // 设置列为只读
            treeList1.Columns.Cast().ToList().ForEach(column =>
            {
                column.OptionsColumn.ReadOnly = true;
                column.OptionsColumn.AllowEdit = false;
            });
            treeList1.Columns["Id"].Visible = false;
        }
 private BindingList GetData()
        {
            // 此属性设为true 每个节点前会自动增加一个check框
            // treeList1.OptionsView.ShowCheckBoxes = true;

            // 此属性设为true 点击复选框时，可设置为半选状态 ??效果还未呈现出来
            // treeList1.OptionsBehavior.AllowIndeterminateCheckState = true;


            // 这里返回一个包含节点数据的BindingList
            // 你可以根据实际情况替换为你自己的数据源
            BindingList data = new BindingList
            {
                new TreeNode { Id = 1, Name = "性别" },
                
                // 其他节点...
            };

            return data;
        }
  public class TreeNode
        {
            public int Id { get; set; }
            public string Name { get; set; }
        }

        public DataTable CreateDataTable()
        {
            DataTable dt = new DataTable();

            //此属性设为true 每个节点前会自动增加一个check框
            treeList1.OptionsView.ShowCheckBoxes = true;

            //此属性设为true 点击复选框时，可设置为半选状态 ??效果还未呈现出来
            treeList1.OptionsBehavior.AllowIndeterminateCheckState = true;

            dt.Columns.Add("ID");
            dt.Columns.Add("PARENTID");
            dt.Columns.Add("NAME");


            //为此表增加数据
            DataRow dr1 = dt.NewRow();
            dr1["ID"] = 1;
            dr1["PARENTID"] = 1;
            dr1["NAME"] = "类目1";
            dt.Rows.Add(dr1);

            DataRow dr2 = dt.NewRow();
            dr2["ID"] = 2;
            dr2["PARENTID"] = 1;
            dr2["NAME"] = "商品1";
            dt.Rows.Add(dr2);

            DataRow dr3 = dt.NewRow();
            dr3["ID"] = 3;
            dr3["PARENTID"] = 1;
            dr3["NAME"] = "商品2";
            dt.Rows.Add(dr3);
            DataRow dr31 = dt.NewRow();
            dr31["ID"] = 7;
            dr31["PARENTID"] = 1;
            dr31["NAME"] = "类目3";
            dt.Rows.Add(dr31);

            DataRow dr4 = dt.NewRow();
            dr4["ID"] = 4;
            dr4["PARENTID"] = 4;
            dr4["NAME"] = "类目2";
            dt.Rows.Add(dr4);

            DataRow dr5 = dt.NewRow();
            dr5["ID"] = 5;
            dr5["PARENTID"] = 4;
            dr5["NAME"] = "商品1";
            dt.Rows.Add(dr5);


            DataRow dr6 = dt.NewRow();
            dr6["ID"] = 6;
            dr6["PARENTID"] = 4;
            dr6["NAME"] = "商品2";
            dt.Rows.Add(dr6);



            this.treeList1.DataSource = dt;
            this.treeList1.KeyFieldName = "ID";
            this.treeList1.ParentFieldName = "PARENTID";
            this.treeList1.Columns[0].Caption = "测试";//树的名称

            return dt;
        }

        public DataTable CreateTreeList()
        {
            DataTable dt = new DataTable();

            #region TreeList属性设置

            //节点前显示复选框
            this.treeList2.OptionsView.ShowCheckBoxes = true;

            //此属性设为true 点击复选框时，可设置为半选状态
            treeList1.OptionsBehavior.AllowIndeterminateCheckState = true;


            #endregion

            #region 在TreeList中增加列
            //用于标识当前节点和当前节点的父节点
            dt.Columns.Add("ID");
            dt.Columns.Add("PARENTID");

            //第一列数据的名称
            dt.Columns.Add("NAME");

            //第二列（节点编码的名称）
            dt.Columns.Add("CODE");

            //第三列（其他）
            dt.Columns.Add("OTHERS");
            #endregion

            #region 添加数据

            //第一行数据
            DataRow dr1 = dt.NewRow();
            dr1["ID"] = 1;
            dr1["PARENTID"] = DBNull.Value;
            dr1["NAME"] = "根节点1";
            dr1["CODE"] = "根节点1编码";
            dr1["OTHERS"] = "根节点1的其他信息";
            dt.Rows.Add(dr1);

            //第二行数据
            DataRow dr2 = dt.NewRow();
            dr2["ID"] = 2;
            dr2["PARENTID"] = 1;
            dr2["NAME"] = "当前节点2";
            dr2["CODE"] = "当前节点2编码";
            dr2["OTHERS"] = "当前节点2的其他信息";
            dt.Rows.Add(dr2);

            //第三行数据
            DataRow dr3 = dt.NewRow();
            dr3["ID"] = 3;
            dr3["PARENTID"] = 1;
            dr3["NAME"] = "当前节点3";
            dr3["CODE"] = "当前节点3编码";
            dr3["OTHERS"] = "当前节点3的其他信息";
            dt.Rows.Add(dr3);

            //第四行数据
            DataRow dr4 = dt.NewRow();
            dr4["ID"] = 4;
            dr4["PARENTID"] = DBNull.Value;
            dr4["NAME"] = "根节点2";
            dr4["CODE"] = "根节点2编码";
            dr4["OTHERS"] = "根节点2的其他信息";
            dt.Rows.Add(dr4);

            //第五行数据
            DataRow dr5 = dt.NewRow();
            dr5["ID"] = 5;
            dr5["PARENTID"] = 4;
            dr5["NAME"] = "当前节点5";
            dr5["CODE"] = "当前节点5编码";
            dr5["OTHERS"] = "当前节点5的其他信息";
            dt.Rows.Add(dr5);

            //第六行数据
            DataRow dr6 = dt.NewRow();
            dr6["ID"] = 6;
            dr6["PARENTID"] = 4;
            dr6["NAME"] = "当前节点6";
            dr6["CODE"] = "当前节点6编码";
            dr6["OTHERS"] = "当前节点6的其他信息";
            dt.Rows.Add(dr6);
            #endregion

            #region 绑定数据源并设置列名
            this.treeList2.DataSource = dt;
            this.treeList2.KeyFieldName = "ID";
            this.treeList2.ParentFieldName = "PARENTID";

            //这句一定要写在上面两句的下面
            this.treeList2.Columns[0].Caption = "节点名称";
            this.treeList2.Columns[1].Caption = "节点编码";
            this.treeList2.Columns[2].Caption = "节点其他信息";
            #endregion

            return dt;
        }

        private void 添加ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FrmDictionaryTreeEdit frm = new FrmDictionaryTreeEdit();
            frm.ShowDialog();

            if (frm.DialogResult != DialogResult.OK)
                return;

            // 创建新节点
            var newNode = new TreeNode { Id = GetNewNodeId(), Name = frm.TypeName };

            // 获取选中的节点
            TreeListNode selectedNode = treeList1.FocusedNode;

            //if (selectedNode == null)
            //{
            // 如果没有选中节点，添加到根节点
            treeList1.AppendNode(new object[] { newNode.Id, newNode.Name }, null);
            //}
            //else
            //{
            //    // 如果有选中节点，添加为选中节点的子节点
            //    treeList1.AppendNode(new object[] { newNode.Id, newNode.Name }, selectedNode);
            //    selectedNode.Expanded = true; // 展开选中节点以显示子节点
            //}
        }

        private void 修改ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            TreeListNode selectedNode = treeList1.FocusedNode;

            if (selectedNode != null)
            {
                FrmDictionaryTreeEdit frm = new FrmDictionaryTreeEdit();

                // 获取选中节点的数据
                int nodeId = Convert.ToInt32(selectedNode.GetValue("ID"));
                frm.TypeName = selectedNode.GetValue("Name").ToString();

                frm.ShowDialog();

                if (frm.DialogResult != DialogResult.OK)
                    return;

                string editedName = frm.TypeName;

                // 更新TreeList中的节点数据
                selectedNode.SetValue("Name", editedName);
            }
        }

        private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            TreeListNode selectedNode = treeList1.FocusedNode;

            if (selectedNode != null)
            {
                // 删除选中的节点
                treeList1.DeleteNode(selectedNode);
            }
        }
        private int GetNewNodeId()
        {
            // 这里可以根据需要生成新节点的ID，确保其唯一性
            // 例如，你可以查询已存在的节点ID的最大值，然后加1
            int maxId = (from TreeListNode node in treeList1.Nodes select Convert.ToInt32(node.GetValue("ID"))).Concat(new[] { -1 }).Max();

            return maxId + 1;
        }

控件：TreeList ，GirdControl,ContextMenuStrip