winform 中键盘弹起事件不能响应 WM_KEYUP


    protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData) //激活回车键
        {            const int WM_KEYDOWN = 0x100;
            const int WM_KEYUP = 0x101;
            const int WM_SYSKEYDOWN = 0x104;
            const int WM_SYSKEYUP = 0x105;                if (msg.Msg == WM_KEYDOWN | msg.Msg == WM_SYSKEYDOWN)
                {
                    switch (keyData)
                    {
                        case Keys.Up: ControlActionMessage("持续向上移动", SecondView.MoveUpPress(zoomSpeed.Value)); return true; ;
                        case Keys.Down: ControlActionMessage("持续向下移动", SecondView.MoveDownPress(zoomSpeed.Value)); return true; ;
                        case Keys.Right: ControlActionMessage("持续向右移动", SecondView.MoveRightPress(zoomSpeed.Value)); return true; ; //这里是写什么方法 ？
                        case Keys.Left: ControlActionMessage("持续向左移动", SecondView.MoveLeftPress(zoomSpeed.Value)); return true; ;//这里是写什么方法 ？
                    }
                }                if (msg.Msg == WM_KEYUP | msg.Msg == WM_SYSKEYUP)
                {
                    switch (keyData)
                    {
                        case Keys.Up:
                        case Keys.Down:
                        case Keys.Right:
                        case Keys.Left:
                            ControlActionMessage("停止移动", SecondView.StopCam());
                            return true;
                    }
                }
            return base.ProcessCmdKey(ref msg, keyData);
        }WM_KEYUP 就是没响应。