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

缺乏、安全感 2023-10-11 13:46 42阅读 0赞

## 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][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][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_102548490]

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。

![20191014162421376.gif][]

注：

博客主页：  
[https://blog.csdn.net/badao\_liumang\_qizhi][https_blog.csdn.net_badao_liumang_qizhi]  
关注公众号  
霸道的程序猿  
获取编程相关电子书、教程推送与免费下载。

## 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。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_100061243]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/100061243
[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_102548490]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/102548490
[20191014162421376.gif]: https://img-blog.csdnimg.cn/20191014162421376.gif
[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191014162633461.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70