Button 单击按钮时添加下拉菜单-windows 8

我想在用户单击

按钮时显示
下拉菜单
。类似于组合框

，但它不是组合框，而是一个按钮。我该怎么做呢？

米兰

您需要创建一个自定义控件或一个用户控件，该控件结合了按钮和弹出窗口。您也可以通过一个按钮和弹出窗口就地实现这一点。我建议您看看Callisto的菜单控件，然后从那里开始实现您的下拉菜单：

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我用弹出菜单解决了这个问题。这是代码，供他人参考

    public static Rect GetElementRect(FrameworkElement element)
    {
        GeneralTransform buttonTransform = element.TransformToVisual(null);
        Point point = buttonTransform.TransformPoint(new Point());
        return new Rect(point, new Size(element.ActualWidth, element.ActualHeight));
    }

    private async void Button_Click(object sender, RoutedEventArgs e)
    {
        var menu = new PopupMenu();
        menu.Commands.Add(new UICommand("Label", (command) =>
        {
            //do work
        }));

        // We don't want to obscure content, so pass in a rectangle representing the sender of the context menu event.
        // We registered command callbacks; no need to handle the menu completion event
        var chosenCommand = await menu.ShowForSelectionAsync(GetElementRect((FrameworkElement)sender));
        if (chosenCommand == null) // The command is null if no command was invoked.
        {

        }
    }