如何以编程方式在wp7中动态创建按钮中添加堆栈面板

Question

我想知道如何在包含Stackpanel作为容器的代码后面创建一个按钮和textblock内stackpanel作为子，当我试图创建按钮时，它抛出空异常在stackpanel。请帮助我解决这个问题。

我试过的是:

foreach (var pd in Query)
{
    Button b = new Button();
    b.HorizontalContentAlignment = HorizontalAlignment.Stretch;
    b.HorizontalAlignment = HorizontalAlignment.Left;
    b.VerticalAlignment = VerticalAlignment.Top;
    b.Height = 196;
    b.Width = 172;
    b.Margin = new Thickness(d, 0, 0, 0);
    b.Style = this.Resources["ButtonStyle1"] as Style;
    Grid st = new Grid();
    st.HorizontalAlignment = HorizontalAlignment.Stretch;
    st.Width = 160;
    st.Height = 188;
    TextBlock tb = new TextBlock();
    tb.TextWrapping = TextWrapping.Wrap;
    tb.VerticalAlignment = VerticalAlignment.Top;
    tb.HorizontalAlignment = HorizontalAlignment.Stretch;
    tb.FontSize = 14;
    tb.Margin = new Thickness(10, 0, 0, 0);
    tb.RenderTransformOrigin = new Point(0.5, 0.5);
    tb.FontSize = 14;
    tb.FontWeight = FontWeights.Bold;
    tb.Height = 35;
    TextBlock tb1 = new TextBlock();
    tb1.Height = 109;
    tb1.VerticalAlignment = VerticalAlignment.Bottom;
    tb1.HorizontalAlignment = HorizontalAlignment.Stretch;
    tb1.FontSize = 12;
    tb1.TextWrapping = TextWrapping.Wrap;
    b.Content = pd.ProductName;
    b.FontSize = 14;
    b.Background = new SolidColorBrush(Colors.Red);
    ContentPanel.Children.Add(b);
    b.Click += new RoutedEventHandler(b_Click);
    st.Children.Add(tb);
    st.Children.Add(tb1);
    st = b.Content as Grid;
    d += 140;
}

Answer 1

在你的代码中你实际上并没有使用st的值，我相信你最后想做的是b.Content = st;而不是st = b.Content as Grid