2021-08-23 WPF控件专题 TreeView控件详解

布满荆棘的人生 2022-09-07 09:53 188阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW94aTIwMjA_size_16_color_FFFFFF_t_70]

## 一：静态使用 ##

## 1.TreeView控件介绍 ##

TreeView简介 ：父类：ItemsControl —条目控件 MenuItem:HeaderedItemsControl

按层次结构组织数据 TreeViewItem —HeaderedItemsControl

属性介绍  
SelectedItem 选择的项 SelectedValue 选择项的值  
SelectedValuePath (string) 菜单名称 编号（列名或属性名）  
ItemsSource 数据源

TreeViewItem介绍

TreeViewItem —HeaderedItemsControl  
ItemsSource IsExpanded true 展开 false（默认） 折叠  
IsSelected 是否选择

## 2.具体案例 ##

/// <summary>
    /// 节点选择响应事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void TvLsit_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
    { 
            var val = e.NewValue as TreeViewItem;
            MessageBox.Show(val.Header.ToString());
    }

## 二：动态使用 ##

## 1.TreeView控件介绍 ##

代码创建节点：可后台代码添加节点，并不比xaml代码简洁

多层次数据，构造出来：数据库表、Xml文档、Excel数据  
编号 名称 父节点编号

1 进销存系统 0  
2 系统管理 1  
3 用户管理 2

动态生成节点树—分层数据模板

DataType 数据模型  
ItemsSource 下一级别的数据列表

## 2.具体案例 ##

namespace WpfAppTest
    { 
            /// <summary>
            /// TreeViewWindow2.xaml 的交互逻辑
            /// </summary>
            public partial class TreeViewWindow2 : Window
            { 
                    public TreeViewWindow2()
                    { 
                            InitializeComponent();
                    }
    
                    private void Window_Loaded(object sender, RoutedEventArgs e)
                    { 
                            //代码添加节点---并不比xaml代码简洁
                            { 
                                    //TreeViewItem ti = new TreeViewItem();
                                    //ti.Header = "进销存管理系统";
                                    //tvList.Items.Add(ti);
    
                                    根节点下添加三个子节点
                                    //TreeViewItem ti1 = new TreeViewItem();
                                    //ti1.Header = "系统管理";
                                    //ti.Items.Add(ti1);
                                    //TreeViewItem ti2 = new TreeViewItem();
                                    //ti2.Header = "业务管理";
                                    //ti.Items.Add(ti2);
                                    //TreeViewItem ti3 = new TreeViewItem();
                                    //ti3.Header = "查询中心";
                                    //ti.Items.Add(ti3);
    
                                    系统管理节点下添加4个子节点
                                    //TreeViewItem ti11 = new TreeViewItem();
                                    //ti11.Header = "用户管理";
                                    //ti1.Items.Add(ti11);
                                    //TreeViewItem ti12 = new TreeViewItem();
                                    //ti12.Header = "角色管理";
                                    //ti1.Items.Add(ti12);
                                    //TreeViewItem ti13 = new TreeViewItem();
                                    //ti13.Header = "菜单管理";
                                    //ti1.Items.Add(ti13);
                                    //TreeViewItem ti14 = new TreeViewItem();
                                    //ti14.Header = "权限管理";
                                    //ti1.Items.Add(ti14);
                            }
    
                            { 
                                    List<MenuInfo> allMenus = GetMenuList();//基础菜单数据
                                    List<MenuItemModel> menuList = new List<MenuItemModel>();//目标菜单数据
                                    AddAllMenus(allMenus, menuList, null, 0);
                                    VMenuModel vmodel = new VMenuModel();
                                    vmodel.MenuList = menuList;
                                    this.DataContext = vmodel;//当前Window的数据上下文
                            }
               
                    }
    
    
                    /// <summary>
                    /// 递归加载菜单项数据
                    /// </summary>
                    /// <param name="allMenus"></param>
                    /// <param name="menusList"></param>
                    /// <param name="pMenu"></param>
                    /// <param name="parentId"></param>
                    private void AddAllMenus(List<MenuInfo> allMenus, List<MenuItemModel> menusList, MenuItemModel pMenu, int parentId)
                    { 
                            var subList = allMenus.Where(m => m.ParentId == parentId);
                            foreach (var mi in subList)
                            { 
                                    MenuItemModel miInfo = new MenuItemModel();
                                    miInfo.MenuId = mi.MenuId;
                                    miInfo.MenuName = mi.MenuName;
                                    if (pMenu != null)
                                            pMenu.SubItems.Add(miInfo);
                                    else
                                            menusList.Add(miInfo);
                                    AddAllMenus(allMenus, menusList, miInfo, mi.MenuId);
                            }
                    }
    
                    /// <summary>
                    /// 获取菜单数据
                    /// </summary>
                    /// <returns></returns>
                    private List<MenuInfo> GetMenuList()
                    { 
                            string sql = "select MenuId,MenuName,ParentId from MenuInfos";
                            SqlDataReader dr = SqlHelper.ExecuteReader(sql, 1);
                            List<MenuInfo> list = new List<MenuInfo>();
                            while (dr.Read())
                            { 
                                    MenuInfo menu = new MenuInfo();
                                    menu.MenuId = (int)dr["MenuId"];
                                    menu.MenuName = dr["MenuName"].ToString();
                                    menu.ParentId = (int)dr["ParentId"];
                                    list.Add(menu);
                            }
                            dr.Close();
                            return list;
                    }
    
                    private void TvList_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
                    { 
                            //响应操作
                            var val = e.NewValue as MenuItemModel;//
                            MessageBox.Show(val.MenuName);
                    }
            }
    }
    public class VMenuModel
    { 
            /// <summary>
            /// Menu控件的数据源属性
            /// </summary>
            public List<MenuItemModel> MenuList {  get; set; }
    }
    
    public class MenuInfo
    { 
        public int MenuId {  get; set; }
        public string MenuName {  get; set; }
        public int ParentId {  get; set; }
        public string MKey {  get; set; }
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW94aTIwMjA_size_16_color_FFFFFF_t_70]: /images/20220829/3a0d08022d7c471ab22fb941179b563a.png