WPFで暗黙的なスクロールバーを操作する方法は？

Question

このListBoxによって自動的に作成されるScrollViewerには、どうすればアクセスできますか？私はScrollToBottomする必要があります。

<ListBox Name="messageListBox" Height="300" > 
     <ListBox.ItemTemplate > 
      <DataTemplate> 
       <StackPanel Orientation="Horizontal"> 
        <TextBlock Text="{Binding Path=LastUpdateDT, StringFormat=HH:mm}" Margin="0,0,5,0"/> 
        <TextBlock Text="{Binding Path=Message}"/> 
       </StackPanel> 
      </DataTemplate> 
     </ListBox.ItemTemplate> 
    </ListBox> 

Answer 1

あなたはビジュアルツリーを下に再帰的要素をつかむことができます。一番下までスクロールし

var scroller = GetLogicalChildrenBreadthFirst(messageListBox) 
        .OfType<ScrollViewer>().First(); 

/// <summary> 
/// Helper function that returns a list of the visual children. 
/// </summary> 
/// <param name="parent">Element whose visual children will be returned.</param> 
/// <returns>A collection of visualchildren.</returns> 
private IEnumerable<FrameworkElement> GetLogicalChildrenBreadthFirst(FrameworkElement parent) 
{ 
    if (parent == null) throw new ArgumentNullException("parent"); 

    Queue<FrameworkElement> queue = new Queue<FrameworkElement>(GetVisualChildren(parent).OfType<FrameworkElement>()); 

    while (queue.Count > 0) 
    { 
     FrameworkElement element = queue.Dequeue(); 
     yield return element; 

     foreach (FrameworkElement visualChild in GetVisualChildren(element).OfType<FrameworkElement>()) 
      queue.Enqueue(visualChild); 
    } 
} 

/// <summary> 
/// Helper function that returns the direct visual children of an element. 
/// </summary> 
/// <param name="parent">The element whose visual children will be returned.</param> 
/// <returns>A collection of visualchildren.</returns> 
private IEnumerable<DependencyObject> GetVisualChildren(DependencyObject parent) 
{ 
    if (parent == null) throw new ArgumentNullException("parent"); 

    int childCount = VisualTreeHelper.GetChildrenCount(parent); 
    for (int counter = 0; counter < childCount; counter++) 
    { 
     yield return VisualTreeHelper.GetChild(parent, counter); 
    } 
} 

Answer 2

簡単な方法を：

listBox1.ScrollIntoView(listBox1.Items[listBox1.Items.Count - 1]);