WPFでTreeviewItemを選択

Question

私はtreeviewitemを検索して選択するための検索テキストボックスを持っています。ツリービューの子アイテムは遅延ロードされています。

検索テキストボックスに渡されたツリービューの子時間を選択したいと思います。

これをどのように達成できますか？

おかげ シャラス

Answer 1

ここツリービュー内の項目を選択する方法についていくつかの良い情報があります：

http://askernest.com/archive/2008/01/23/how-to-programmatically-change-the-selecteditem-in-a-wpf-treeview.aspx

と、ここ：ここ

http://www.codeproject.com/KB/WPF/TreeView_SelectionWPF.aspx

Answer 2

は私のヘルパーです、抽出物は、必要なもの： PS。私はExpandAllメソッドをテストしたことがありません。

Imports System.Runtime.CompilerServices 
Imports System.Windows.Controls.Primitives 

<HideModuleName()> 
Module TreeViewHelper 

    <Extension()> 
    Public Sub SetSelectedItem(ByVal treeView As TreeView, ByVal item As Object) 
    SetSelectedItemInternal(treeView, item) 
    End Sub 
    <Extension()> 
    Public Sub SetSelectedItem(ByVal treeViewItem As TreeViewItem, 
          ByVal item As Object) 
    SetSelectedItemInternal(treeViewItem, item) 
    End Sub 
    Private Sub SetSelectedItemInternal(ByVal control As ItemsControl, 
             ByVal item As Object) 
    ValidateItemsControl(control) 
    If item Is Nothing Then Throw New ArgumentNullException("item") 
    If Not control.Items.Contains(item) Then _ 
     Throw New ArgumentOutOfRangeException("item", 
     "Specified item was not found in the control.") 

    If control.ItemContainerGenerator.Status = 
     GeneratorStatus.ContainersGenerated Then 

     DirectCast(control.ItemContainerGenerator.ContainerFromItem(item), 
     TreeViewItem).IsSelected = True 
    Else 
     Dim selectWhenReadyMethod As EventHandler 

     selectWhenReadyMethod = 
     Sub(sender, e) 
      If control.ItemContainerGenerator.Status = 
      GeneratorStatus.ContainersGenerated Then 
      RemoveHandler control.ItemContainerGenerator.StatusChanged, 
       selectWhenReadyMethod 

      SetSelectedItemInternal(control, item) 
      End If 
     End Sub 
     AddHandler control.ItemContainerGenerator.StatusChanged, 
     selectWhenReadyMethod 
    End If 
    End Sub 

    <Extension()> 
    Public Sub SetSelectedIndex(ByVal treeView As TreeView, ByVal index As Object) 
    SetSelectedIndexInternal(treeView, index) 
    End Sub 
    <Extension()> 
    Public Sub SetSelectedIndex(ByVal treeViewItem As TreeViewItem, 
           ByVal index As Object) 

    SetSelectedIndexInternal(treeViewItem, index) 
    End Sub 
    Private Sub SetSelectedIndexInternal(ByVal control As ItemsControl, 
             ByVal index As Object) 

    ValidateItemsControl(control) 

    If index < 0 OrElse index > control.Items.Count - 1 Then _ 
     Throw New ArgumentOutOfRangeException("index") 

    If control.ItemContainerGenerator.Status = 
     GeneratorStatus.ContainersGenerated Then 

     DirectCast(control.ItemContainerGenerator.ContainerFromIndex(index), 
     TreeViewItem).IsSelected = True 

    Else 
     Dim selectWhenReadyMethod As EventHandler 

     selectWhenReadyMethod = 
     Sub(sender, e) 
      If control.ItemContainerGenerator.Status = 
      GeneratorStatus.ContainersGenerated Then 
      RemoveHandler control.ItemContainerGenerator.StatusChanged, 
       selectWhenReadyMethod 

      SetSelectedIndexInternal(control, index) 
      End If 
     End Sub 
     AddHandler control.ItemContainerGenerator.StatusChanged, 
     selectWhenReadyMethod 
    End If 
    End Sub 

    <Extension()> 
    Public Sub ExpandAll(ByVal treeView As TreeView) 
    ExpandAllInternal(treeView) 
    End Sub 
    <Extension()> 
    Public Sub ExpandAll(ByVal treeViewItem As TreeViewItem) 
    ExpandAllInternal(treeViewItem) 
    End Sub 
    Private Sub ExpandAllInternal(ByVal control As ItemsControl) 
    ValidateItemsControl(control) 

    If control.Items.IsEmpty Then Exit Sub 

    If control.ItemContainerGenerator.Status = 
     GeneratorStatus.ContainersGenerated Then 

     For i = 0 To control.Items.Count - 1 
     Dim item = 
      DirectCast(control.ItemContainerGenerator.ContainerFromIndex(i), 
      TreeViewItem) 

     item.IsExpanded = True 
     ExpandAllInternal(control) 
     Next 
    Else 
     Dim expandWhenReadyMethod As EventHandler 

     expandWhenReadyMethod = 
     Sub(sender, e) 
      If control.ItemContainerGenerator.Status = 
      GeneratorStatus.ContainersGenerated Then 
      RemoveHandler control.ItemContainerGenerator.StatusChanged, 
       expandWhenReadyMethod 

      ExpandAllInternal(control) 
      End If 
     End Sub 
     AddHandler control.ItemContainerGenerator.StatusChanged, 
     expandWhenReadyMethod 
    End If 
    End Sub 

    Private Sub ValidateItemsControl(ByVal control As ItemsControl) 
    If control Is Nothing Then Throw New ArgumentNullException("control") 
    If Not TypeOf control Is TreeView AndAlso 
     Not TypeOf control Is TreeViewItem Then _ 
     Throw New _ 
     NotSupportedException(control.GetType.FullName & " is not supported.") 
    End Sub 

End Module