无法在 wpf 的组合框中捕获向下箭头 [英] could not capture down arrow in combobox in wpf

问题描述

我在 wpf 的窗口上有一个组合框，我试图捕捉这个组合框的向下箭头键，但我无法这样做.以下是我对组合框的唯一代码.

I have a combobox on a window in wpf and i am trying to capture the down arrow key of this combobox but i am not able to do so. The following is the only code i have for the combobox.

<ComboBox Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120"
              PreviewKeyDown="comboBox1_PreviewKeyDown" KeyDown="comboBox1_KeyDown" IsEditable="True"/>

C#

private void comboBox1_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Down)
            MessageBox.Show("hi");
    }

    private void comboBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Down)
            MessageBox.Show("hi");
    }

当我按下箭头键时，事件甚至没有被击中.

The event is not even hit when i press down arrow key.

推荐答案

尝试处理 PreviewKeyUp(或 KeyUp).如果这不起作用，那么您的窗口或代码中必须有更多内容(您是否正在处理这些事件的其他实例)?

Try handling PreviewKeyUp (or KeyUp) instead. If that does not work, then there must be more to your window or code (are you handling other instances of these events)?

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