如何按名称或类型查找WPF控件？

我结合了John Myczek和上面的Tri Q算法所使用的模板格式，以创建可在任何父级上使用的findChild算法。请记住，向下递归搜索树可能是一个漫长的过程。我只是在WPF应用程序上进行了抽查，请对您可能发现的任何错误发表评论，我将更正我的代码。

WPF Snoop是查看视觉树的有用工具-我强烈建议您在测试时使用它，或使用此算法来检查您的工作。

Tri Q算法中有一个小错误。找到孩子后，如果childrenCount> 1，然后再次进行迭代，我们可以覆盖正确找到的孩子。因此，我if (foundChild != null) break;在代码中添加了a来处理这种情况。

/// <summary>
/// Finds a Child of a given item in the visual tree. 
/// </summary>
/// <param name="parent">A direct parent of the queried item.</param>
/// <typeparam name="T">The type of the queried item.</typeparam>
/// <param name="childName">x:Name or Name of child. </param>
/// <returns>The first parent item that matches the submitted type parameter. 
/// If not matching item can be found, 
/// a null parent is being returned.</returns>
public static T FindChild<T>(DependencyObject parent, string childName)
   where T : DependencyObject
{    
  // Confirm parent and childName are valid. 
  if (parent == null) return null;

  T foundChild = null;

  int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
  for (int i = 0; i < childrenCount; i++)
  {
    var child = VisualTreeHelper.GetChild(parent, i);
    // If the child is not of the request child type child
    T childType = child as T;
    if (childType == null)
    {
      // recursively drill down the tree
      foundChild = FindChild<T>(child, childName);

      // If the child is found, break so we do not overwrite the found child. 
      if (foundChild != null) break;
    }
    else if (!string.IsNullOrEmpty(childName))
    {
      var frameworkElement = child as FrameworkElement;
      // If the child's name is set for search
      if (frameworkElement != null && frameworkElement.Name == childName)
      {
        // if the child's name is of the request name
        foundChild = (T)child;
        break;
      }
    }
    else
    {
      // child element found.
      foundChild = (T)child;
      break;
    }
  }

  return foundChild;
}

这样称呼它：

TextBox foundTextBox = 
   UIHelper.FindChild<TextBox>(Application.Current.MainWindow, "myTextBoxName");

注意Application.Current.MainWindow可以是任何父窗口。