Windows应用程序ComboBox向上打开 [英] Windows app ComboBox open upwards

问题描述

我试图在Windows应用程序中获取 ComoboBox 向上打开而不是向下打开。我已经阅读过有关在WPF中执行此操作的信息，但显然语法有所不同。我试过修改 ComboBox 的 ControlTemplate ，但是我不确定我应该修改哪个属性

I am trying to get a ComoboBox in a Windows App to open upwards instead of downwards. I've read about doing this in WPF but obviously the syntax is a little different. I've tried modifying the ControlTemplate of the ComboBox but I am not sure exactly what property I am supposed to be modifying.

对于 Windows应用 code，有简单的方法吗？

Is there an easy way to do this for a Windows App?

编辑：当我尝试应用Florian的修复程序时，出现以下构建错误：

When I try to apply Florian's fix, I get the following build error:

Error   1   'Windows.UI.Xaml.Controls.ControlTemplate' does not contain a definition for 'FindName' and no extension method 'FindName' 
accepting a first argument of type 'Windows.UI.Xaml.Controls.ControlTemplate' could be found (are you missing a using directive or an assembly reference?)  

推荐答案

在加载组合时调用此方法：

Call this method when the combo is loaded :

    private void myCombo_Loaded(object sender, System.Windows.RoutedEventArgs e)
    {
        ControlTemplate ct = this.myCombo.Template;
        Popup pop = ct.FindName("PART_Popup", this.myCombo) as Popup;
        pop.Placement = PlacementMode.Top;
    }

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