c# override

//接收屏幕最大化 恢复事件protected override void OnResize(EventArgs e){    if (this.WindowState == FormWindowState.Maximized)    {    }    if (this.WindowState == FormWindowState.Normal)    {    }}//接收系统消息 执行case protected override void DefWndProc(ref Message m){    switch (m.Msg)    {        case 0x0400 + 0x100:            break;        default:            base.DefWndProc(ref m);            break;    }//end  switch (m.Msg)}