c# WPF中的TreeView使用详解

<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>();
  }