在Panel中创建KeyDown事件的麻烦

问题描述

我目前正在开发一个有面板的winform。我需要能够使用面板上的向上，向下，向左和向右箭头，并发现某些事情。

I am currently working on winform that has a panel on it. I need to be able to use the up, down, left and right arrows on the panel and get something to happen.

我尝试使用这一行代码添加事件：

I tried adding the event with this line of code:

            (MainPanel as Control).KeyDown += 
                                 new KeyEventHandler(panelKeyPressEventHandler);

使用此KeyDown代码：

With this KeyDown code:

        public void panelKeyPressEventHandler(object sender, System.Windows.Forms.KeyEventArgs e)
    {

        MessageBox.Show("Here I am!");

        switch (e.KeyCode)
        {
            case Keys.L:
                {

                    break;
                }
            case Keys.R:
                {

                    break;
                }
            case Keys.Up:
                {
                    break;
                }
            case Keys.Down:
                {
                    break;
                }
            case Keys.Right:
                {
                    break;
                }
            case Keys.Left:
                {
                    break;
                }

        }
    }

，即使我保证在面板上设置焦点，我无法让它进入这个KeyDown事件功能的任何东西。 （我可以整天打键，没有任何反应。

Thus far, even when I guarantee focus is set on the panel, I am unable to get it to enter this KeyDown event function for anything. :( I can hit keys all day long and nothing happens.

有没有人有任何建议，最好的方法来处理上，下，左，右箭头被按下一个面板有焦点？

Does anyone have any suggestion on the best way to handle up,down,left and right arrows being pressed when a panel has focus?

谢谢！

推荐答案

面板控件您可能需要覆盖您的表单中的 ProcessCmdKey 或 UserControl 。

Panel control cannot get focus and not selectable also. Focused controls can only get "key events". You likely need to override ProcessCmdKey in your form or UserControl.

您需要设置 KeyPreview = true

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    switch(keydata)
    {
        case Keys.Up:
             break;
        ...
    }
    return base.ProcessCmdKey(ref msg, keyData);
}

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