vb.net - 如何获取wpf按钮的父级

Question

我想获取按钮的父级的父级。我可以让 parent 使用

Dim tempB As Button = CType(sender, Button)
Dim g1 As Grid = CType(tempB.Parent, Grid)  

(在我的点击处理程序中)。但如果我这样做了

Dim g2 As New Object
g2 = g1.Parent

tempB.Content = g2.GetType 

我得到一个NullReference Exception

Answer 1

这是一个简单的 C# 片段，它将为您提供单击按钮的所有父级:

   private void Button_Click(object sender, RoutedEventArgs e)
    {
        MessageBox.Show(GetParents(sender, 0));
    }

    private string GetParents(Object element, int parentLevel)
    {
        string returnValue = String.Format("[{0}] {1}", parentLevel, element.GetType());
        if (element is FrameworkElement)
        {
            if (((FrameworkElement) element).Parent != null)
                returnValue += String.Format("{0}{1}",
                    Environment.NewLine, GetParents(((FrameworkElement)element).Parent, parentLevel + 1));
        }
        return returnValue;
    }