WinForms-在控制之前捕获键

Question

I've got a form and am subscribing to the KeyUp event and handling the ALT key, this is working great but only when my form has the focus, if a control on the form has focus then this no longer works; what can I use to capture the keys when controls have focus? I'd rather not have to subscribe to every KeyUp event on every on the form controls...

Thanks.

Answer 1

将表单的KeyPreview属性设置为true是否对您有用 ？

Answer 2

Try overriding ProcessCmdKey from your form. This will be raised regardless of which controls have focus, so long as the form is active. You will have to do a little more work checking the keydata. Ex:

    protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
        if ((keyData & Keys.Alt) == Keys.Alt)
        {
            Debug.WriteLine("ALT");
        }

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