拦截窗体关闭、最大、最小事件 - Winform

RT，不赘述，代码以下：

 const int WM_SYSCOMMAND = 0x112;
 const int SC_CLOSE = 0xF060;
 const int SC_MINIMIZE = 0xF020;
 const int SC_MAXIMIZE = 0xF030;
 protected override void WndProc(ref Message m)
 {
     if (m.Msg == WM_SYSCOMMAND)
     {
         if (m.WParam.ToInt32() == SC_MINIMIZE)
         {

             //......
         }

         if (m.WParam.ToInt32() == SC_MAXIMIZE ) 

         { 

              //.....................

         }

         if (m.WParam.ToInt32() == SC_CLOSE ) 

         {
             //.....................
         }

     }
     base.WndProc(ref m);
 }