protected override void WndProc(ref Message msg)
{
 const int WM_SYSCOMMAND = 0x0112;
 const int SC_CLOSE = 0xF060;
 if (msg.Msg == WM_SYSCOMMAND && ((int)msg.WParam == SC_CLOSE))
 {
  // 點擊winform右上關(guān)閉按鈕 
  // 加入想要的邏輯處理
  return;
 }
 base.WndProc(ref msg);
}