从TabItem获取并迭代控件？

如何获取嵌套在Tabitem中的所有控件/ UIElements（来自TabControl）？

我尝试了一切，但无法得到它们。

（设置SelectedTab）：

private TabItem SelectedTab = null; private void tabControl1_SelectionChanged(object sender, SelectionChangedEventArgs e) { SelectedTab = (TabItem)tabControl1.SelectedItem; } 

现在我需要这样的东西：

  private StackPanel theStackPanelInWhichLabelsShouldBeLoaded = null; foreach (Control control in tabControl.Children /*doesnt exist*/, or tabControl.Items /*only TabItems*/, or /*SelectedTab.Items ??*/ ) //I Have no plan { if(control is StackPanel) { theStackPanelInWhichLabelsShouldBeLoaded = control; //Load Labels in the Stackpanel, thats works without problems } } 

在Silvermind之后：执行此操作，Count始终为1：

  UpdateLayout(); int nChildCount = VisualTreeHelper.GetChildrenCount(SelectedTab); 

Answer 1

TabControl具有Items属性（派生自ItemsControl），它返回所有TabItems – http://msdn.microsoft.com/en-us/library/system.windows.controls.itemscontrol.items.aspx 。 或者你可以遍历可视树：

 var firstStackPanelInTabControl = FindVisualChildren(tabControl).First(); 

使用：

 public static IEnumerable FindVisualChildren(DependencyObject rootObject) where T : DependencyObject { if (rootObject != null) { for (int i = 0; i < VisualTreeHelper.GetChildrenCount(rootObject); i++) { DependencyObject child = VisualTreeHelper.GetChild(rootObject, i); if (child != null && child is T) yield return (T)child; foreach (T childOfChild in FindVisualChildren(child)) yield return childOfChild; } } } 

Answer 2

可能是这种方法会帮助你：

 public static IEnumerable FindChildren(this DependencyObject source) where T : DependencyObject { if (source != null) { var childs = GetChildObjects(source); foreach (DependencyObject child in childs) { //analyze if children match the requested type if (child != null && child is T) { yield return (T) child; } //recurse tree foreach (T descendant in FindChildren(child)) { yield return descendant; } } } } 

请在此处查看完整文章（在WPF树中查找元素）。

Answer 3

对我来说，VisualTreeHelper.GetChildrenCount总是为标签控件返回0，我不得不使用这个方法代替

  public static List ObtenerControles(DependencyObject parent) where T : DependencyObject { List result = new List(); if (parent != null) { foreach (var child in LogicalTreeHelper.GetChildren(parent)) { var childType = child as T; if (childType != null) { result.Add((T)child); } foreach (var other in ObtenerControles(child as DependencyObject)) { result.Add(other); } } } return result; }