WPF中的TreeView

                   <TreeView x:Name="chapterTree"  Grid.Column="0"  SelectedItemChanged="chapterTree_SelectedItemChanged" PreviewMouseRightButtonDown="chapterTree_PreviewMouseRightButtonDown" FontSize="14"  ItemsSource="{Binding Path=Nodes}" >                                                 <TreeView.ContextMenu>                             <ContextMenu>                                 <MenuItem Header="保存" Name="btnAlterData" Click="btnAlterData_Click" />                                 <MenuItem Header="新增兄弟节点" Name="btnSaveData" Click="btnSaveData_Click"/>                                 <MenuItem Header="新增子节点" Name="btnSaveSonData" Click="btnSaveSonData_Click"/>                                 <MenuItem Header="删除" Name="btnDdeleteData" Click="btnDdeleteData_Click"/>                                 <MenuItem Header="上移一位" Name="btnUp" Click="btnUp_Click"/>                                 <MenuItem Header="下移一位" Name="btnDown" Click="btnDown_Click"/>                             </ContextMenu>                         </TreeView.ContextMenu>                         <TreeView.ItemTemplate>                             <HierarchicalDataTemplate DataType="{x:Type c:OrderModel}" ItemsSource="{Binding Path=ChildNodes}">                                 <Label Content="{Binding Path=OrderName}"/>                             </HierarchicalDataTemplate>                         </TreeView.ItemTemplate>                     </TreeView>

        CommandModel cm;          public Command()         {             InitializeComponent();             cm = new CommandModel();             chapterTree.ItemsSource = cm.Nodes;          }

        public event PropertyChangedEventHandler PropertyChanged;         private ObservableCollection<OrderModel> nodes = new ObservableCollection<OrderModel>();         public ObservableCollection<OrderModel> Nodes         {             get { return nodes; }             set             {                 nodes = value;                 if (PropertyChanged != null)                     PropertyChanged(this, new PropertyChangedEventArgs("Nodes"));             }         }                  public CommandModel()         {             Initiate();         }         private void Initiate()         {             using (SQLiteConnection con = new SQLiteConnection(MainWindow.sb.ToString()))             {                 DataTable table = new DataTable("MyTable");                 var reader = con.ExecuteReader("SELECT * FROM OrderData Order by OrderID");                 table.Load(reader);                 ObservableCollection<OrderModel> _nodes = new ObservableCollection<OrderModel>();                 _nodes = ConvertToList(table);                  //ShowTreeView();                 Nodes = getChildNodes(0, _nodes);              }         }          private ObservableCollection<OrderModel> getChildNodes(long parentID, ObservableCollection<OrderModel> nodes)         {             List<OrderModel> a = new List<OrderModel>(nodes.Where(x => x.ParentID == parentID).ToList());             ObservableCollection<OrderModel> mainNodes =new ObservableCollection<OrderModel>(a);             List<OrderModel> b = new List<OrderModel>(nodes.Where(x => x.ParentID != parentID).ToList());             ObservableCollection<OrderModel> otherNodes =new ObservableCollection<OrderModel>(b);             foreach (OrderModel node in mainNodes)                 node.ChildNodes = getChildNodes(node.ID, otherNodes);             return mainNodes;         }             #region    datatable转list          /// <summary>         /// datatable转list         /// </summary>         /// <param name="dt"></param>         /// <returns></returns>         public static ObservableCollection<OrderModel> ConvertToList(DataTable dt)         {              // 定义集合             ObservableCollection<OrderModel> ts = new ObservableCollection<OrderModel>();              // 获得此模型的类型             Type type = typeof(OrderModel);             //定义一个临时变量             string tempName = string.Empty;             //遍历DataTable中所有的数据行             foreach (DataRow dr in dt.Rows)             {                 OrderModel t = new OrderModel();                 // 获得此模型的公共属性                 PropertyInfo[] propertys = t.GetType().GetProperties();                 //遍历该对象的所有属性                 foreach (PropertyInfo pi in propertys)                 {                     tempName = pi.Name;//将属性名称赋值给临时变量                     //检查DataTable是否包含此列（列名==对象的属性名）                       if (dt.Columns.Contains(tempName))                     {                         // 判断此属性是否有Setter                         if (!pi.CanWrite) continue;//该属性不可写，直接跳出                         //取值                         object value = dr[tempName];                         //如果非空，则赋给对象的属性                         if (value != DBNull.Value)                             pi.SetValue(t, value, null);                     }                 }                 //对象添加到泛型集合中                 ts.Add(t);             }              return ts;         }          #endregion

        public ObservableCollection<OrderModel> ChildNodes { get; set; }         public OrderModel()         {             ChildNodes = new ObservableCollection<OrderModel>();         }