有时候需要拦截键盘的事件使程序按照设计者的要求执行。

        protected override void WndProc(ref Message m)
        {
            const int WM_HOTKEY = 0x0312; // 热键消息
            if (m.Msg == WM_HOTKEY)
            {
                //最大最小化热键

            }

            // 鼠标左键右键中间滑轮事件时，屏保计时器清零 [9/15/2010 huzhonghua]
            const int WM_LBUTTONDOWN = 0x0201;
            const int WM_RBUTTONDOWN = 0x0204;
            const int WM_MOUSEDOWN = 0x0210;
            const int WM_MOUSEWHEEL = 0x020A;
            if (m.Msg == WM_MOUSEDOWN || m.Msg == WM_LBUTTONDOWN || m.Msg == WM_RBUTTONDOWN || m.Msg == WM_MOUSEWHEEL)
            {
               //所有键盘事件

            }
            base.WndProc(ref  m);
        }