silverlight 清空所有文本框

        public MainPage()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            Clear(this.LayoutRoot);
        }
        private void Clear(DependencyObject element)
        {
            // If this is a text box, clear the text. 
            TextBox txt = element as TextBox;
            if (txt != null) txt.Text = "";
            // Check for nested children. 
            int children = VisualTreeHelper.GetChildrenCount(element);
            for (int i = 0; i < children; i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(element, i);
                Clear(child);
            }
        }

这里面最重要的是VisualTreeHelper类，可以使用它遍历页面元素,它有一些重要方法

如GetParent()，得到父元素。GetChildrenCount()得到子元素数量