KeyDown事件未触发，KeyPreview设置为true [英] KeyDown event is not firing, KeyPreview set to true

问题描述

我正在构建一个小型Forms应用程序，我刚刚启动了它. 但是我有这个问题: 如果我将控件放到窗体上，则不会触发KeyDown事件.我知道KeyPreview 属性，并将其设置为true.但这并没有帮助... :(我也试图设置 专注于主要形式，也没有成功.

I'm building a small Forms application, i've just started it. But i have this problem: if i put a Control to the form, the KeyDown event is not firing. I'm aware of the KeyPreview property, and set it to true. But that didn't helped... :( I also tried to set the focus to the main form, no success either.

有什么想法吗?

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        KeyDown += new KeyEventHandler(Form1_KeyDown);
        this.KeyPreview = true;
    }

    void Form1_KeyDown(object sender, KeyEventArgs e)
    {
        switch (e.KeyCode)
        {
            case Keys.Left: MessageBox.Show("Left");
                break;
            case Keys.Right: MessageBox.Show("Right");
                break;
        }
    }
}

推荐答案

我已经评论了我的解决方案，但是我也将其发布为答案，以便可以轻松找到它.

I already commented my solution, but I also post it as an answer, so it can be easily found.

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    switch (keyData)
    {
        case Keys.Left:
            // left arrow key pressed
            return true;
        case Keys.Right:
            // right arrow key pressed
            return true;
        case Keys.Up:
            // up arrow key pressed
            return true;
        case Keys.Down:
            // down arrow key pressed
            return true;
    }

    return base.ProcessCmdKey(ref msg, keyData);
}

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