DevExpress的TreeList实现节点上添加自定义右键菜单并实现删除节点功能

场景

实现了树形结构后，我们要实现在树形节点上点击右键时弹窗，弹窗确认之后实现将当前节点删除。

 

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实现

这里在窗体加载完的事件里绑定Treelist的鼠标点击事件。

this.treeList2.MouseClick += treeList2_MouseClick;

在事件方法中

private void treeList2_MouseClick(object sender, MouseEventArgs e)
        {
            //获取当前TreeList对象
            DevExpress.XtraTreeList.TreeList treeList = sender as DevExpress.XtraTreeList.TreeList;
            if (treeList != null && treeList.Selection.Count == 1)
            {
                object idValue = null;
                string strIdValue = String.Empty;
                DataTreeNode nodeData = null;
                //通过TreeList的DataSource属性获取所有节点的List
                List<DataTreeNode> datasource = treeList.DataSource as List<DataTreeNode>;
                if (datasource != null)
                {
                    //获取选中节点的集合中第一个的Id属性
                    idValue = treeList.Selection[0].GetValue("Id");
                    strIdValue = idValue.ToString();
                    //获取当前选中节点DataTreeNode对象
                    nodeData = datasource.Where<DataTreeNode>(p => p.Id == strIdValue).FirstOrDefault<DataTreeNode>();
                    if (nodeData != null)
                    {
                        //获取或设置是否启用聚焦节点的外观设置 -启用整行选中
                            treeList.OptionsSelection.EnableAppearanceFocusedRow = true;                                //启用整行选中

                            #region 右键弹出上下文菜单 - 删除待比较的文件
                            //如果点击的是鼠标右键
                            if (e.Button == System.Windows.Forms.MouseButtons.Right)
                            {
                                //构建右键菜单
                                System.Windows.Forms.ContextMenu ctxMenu = new System.Windows.Forms.ContextMenu();
                                //构建右键删除菜单项
                                System.Windows.Forms.MenuItem mnuDelete = new System.Windows.Forms.MenuItem();
                                mnuDelete.Text = "删除当前文件";
                                //删除菜单项点击事件订阅
                                mnuDelete.Click += delegate(object s, EventArgs ea)
                                {
                                    //DevExpress的对话框
                                    DialogResult dialogResult = DevExpress.XtraEditors.XtraMessageBox.Show(String.Format("确定要删除此实验数据吗[{0}]？\r\n删除后无法恢复!", nodeData.Id), "标题",System.Windows.Forms.MessageBoxButtons.YesNo, MessageBoxIcon.Question);
                                    //如果点击了Yes
                                    if (dialogResult == DialogResult.Yes)
                                    {
                                        try
                                        {
                                            string fileName = String.Empty;

                                            #region 删除对应的树节点
                                            //通过设置主键ID找到节点node
                                            DevExpress.XtraTreeList.Nodes.TreeListNode selectedNode = treeList.FindNodeByKeyID(nodeData.Id);
                                            if (selectedNode != null)
                                            {
                                                //删除节点
                                                this.treeList2.Nodes.Remove(selectedNode);
                                            }
                                            #endregion
                                            //禁用整行选中
                                            treeList.OptionsSelection.EnableAppearanceFocusedRow = false;                              
                                        }
                                        catch (Exception ex)
                                        {
                                            ICSharpCode.Core.LoggingService<DataTreeListHelper>.Error("删除实验数据异常:" + ex.Message, ex);
                                            DevExpress.XtraEditors.XtraMessageBox.Show("删除实验数据异常:" + ex.Message, "标题", MessageBoxButtons.OK, MessageBoxIcon.Error);
                                        }
                                    }
                                };
                                ctxMenu.MenuItems.Add(mnuDelete);
                                ctxMenu.Show(treeList, new System.Drawing.Point(e.X, e.Y));
                            }
                            #endregion
                            return;
                    }
                }
                treeList.OptionsSelection.EnableAppearanceFocusedRow = false;                                //禁用整行选中
            }
        }

具体注释见代码。