如何獲得兩項

Question

之間的所有TreeViewItems我有一個WPF的TreeView是可視化的簡單分層結構如下所示：

> item1 
    item1_1 
    > item1_2 
     item1_2_1 
    item2 
    item3 

在這裏，每個項目可以有任何數量的後代。給定一對任意項目（例如item1_1和item3），我如何獲取中間的所有項目（即item1_2,item1_2_1和item3）？

Answer 1

不優化，但工作

<Window x:Class="WpfApplication5.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:my="clr-namespace:WpfApplication5" 
     Title="MainWindow" Height="300" Width="800" FontSize="25"> 
    <Grid> 
     <Grid.ColumnDefinitions> 
      <ColumnDefinition /> 
      <ColumnDefinition /> 
     </Grid.ColumnDefinitions> 
     <TreeView SelectedItemChanged="TreeView_SelectedItemChanged"> 
      <TreeViewItem Header="A"> 
       <TreeViewItem Header="AA"> 
        <TreeViewItem Header="AAA"/> 
        <TreeViewItem Header="AAB"/> 
       </TreeViewItem> 
       <TreeViewItem Header="AB"/> 
      </TreeViewItem> 
      <TreeViewItem Header="B"> 
       <TreeViewItem Header="BA"/> 
       <TreeViewItem Header="BB"> 
        <TreeViewItem Header="BBA"/> 
        <TreeViewItem Header="BBB"/> 
       </TreeViewItem> 
      </TreeViewItem> 
     </TreeView> 
     <StackPanel Grid.Column="1"> 
      <TextBlock Name="txt1"/> 
      <TextBlock Name="txt2"/> 
      <ListBox Name="lst" ></ListBox> 
     </StackPanel> 
    </Grid> 
</Window> 

public partial class MainWindow : Window 
{ 
    public MainWindow() 
    { 
     InitializeComponent(); 
    } 

    private object itm1; 
    private object itm2; 

    private void TreeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e) 
    { 
     if (itm1 == null || (itm1 != null && itm2 != null)) 
     { 
      itm1 = e.NewValue; 
      itm2 = null; 
      txt1.Text = itm1.ToString(); 
      txt2.Text = ""; 

      return; 
     } 

     itm2 = e.NewValue; 
     txt2.Text = itm2.ToString(); 

     var tree = sender as ItemsControl; 
     firstFound = false; 
     secondFound = false; 
     between = new List<object>(); 

     checkCollection(tree); 

     lst.Items.Clear(); 
     foreach (var itm in between) 
     { 
      lst.Items.Add(itm.ToString()); 
     } 

    } 

    bool firstFound = false; 
    bool secondFound = false; 
    List<object> between = new List<object>(); 
    private void checkCollection(object ctrl) 
    { 
     if (secondFound) 
      return; 

     if (!firstFound && (ctrl == itm1 || ctrl == itm2)) 
     { 
      firstFound = true; 
     } 
     else if (firstFound && (ctrl == itm1 || ctrl == itm2)) 
     { 
      secondFound = true; 
      return; 
     } 

     if (firstFound) 
     { 
      between.Add(ctrl); 
     } 

     var itmsCtrl = ctrl as ItemsControl; 
     foreach (var itm in itmsCtrl.Items) 
     { 
      checkCollection(itm); 
     } 
    } 
}