c# - 如何在 Silverlight 中找到父级的每个元素

Question

这里我想通过按钮点击事件中的元素查找来验证一些文本框

private void button1_Click(object sender, RoutedEventArgs e)
    {
        var button = (Button) sender;

        // button Parent
        var stackPanel = button.Parent as StackPanel;

        // button Parent > parent
        var parentStackPanel = stackPanel.Parent as StackPanel;

        // button Parent > parent > Children
        var childStackPanel = parentStackPanel.Children.Where(a => a is StackPanel).FirstOrDefault() as StackPanel;

        // button Parent > parent > Children >Elements
        var textBox = childStackPanel.Children.Where(a => a is TextBox).FirstOrDefault() as TextBox;
        var image = childStackPanel.Children.Where(a => a is Image).FirstOrDefault() as Image;

        if (textBox.Text == "") image.Source = new BitmapImage(new Uri("/Images/Others/TickWrong.png", UriKind.RelativeOrAbsolute));

    }

问题是由于 FirstOrDefault() 我只能找到第一个元素

var childStackPanel = parentStackPanel.Children.Where(a => a is StackPanel).FirstOrDefault() as StackPanel;

有没有可能找到所有元素的方法。通过数组之类的？？

Answer 1

删除 FirstOrDefault。

var childStackPanels = parentStackPanel.Children.Where(a => a is StackPanel);

这将返回 IEnumerable<T>您可以对其进行迭代。

要获取列表，您可以使用 ToList() IEnumerable<T>的扩展方法