c# WinForm中如何判断关闭事件来源于用户点击右上角的“关闭”按钮

转载自：http://apps.hi.baidu.com/share/detail/31388139

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)) 
          { 
                  // 点击winform右上关闭按钮 
                  // 加入想要的逻辑处理

 

                 return;
          } 
          base.WndProc(ref msg); 
}