从TabItem获取并遍历控件

本文关键字：遍历 控件 获取 TabItem | 更新日期: 2023-09-27 18:28:17

如何（从TabControl）获取嵌套在Tabitem中的所有Controls/UIElement？

我什么都试过了，但没能买到。

（设置所选选项卡）：

    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
        }
  }

Silvermind之后：这样做，计数总是1:

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

从TabItem获取并遍历控件

TabControl具有Items属性（派生自ItemsControl），该属性返回所有TabItems-http://msdn.microsoft.com/en-us/library/system.windows.controls.itemscontrol.items.aspx.或者你可以遍历视觉树：

var firstStackPanelInTabControl = FindVisualChildren<StackPanel>(tabControl).First();

使用：

public static IEnumerable<T> FindVisualChildren<T>(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<T>(child))
        yield return childOfChild;
    }
  }
}

这类方法可能会对您有所帮助：

public static IEnumerable<T> FindChildren<T>(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<T>(child))
      {
        yield return descendant;
      }
    }
  }
}

请参阅本文全文（在WPF树中查找元素）。

对我来说VisualTreeHelper.GetChildrenCount总是为选项卡控件返回0，我不得不使用此方法代替

 public static List<T> ObtenerControles<T>(DependencyObject parent)
    where T : DependencyObject
    {
        List<T> result = new List<T>();           
        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<T>(child as DependencyObject))
                {
                    result.Add(other);
                }
            }
        }
        return result;
    }
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