捕获/重写窗体的最大最小华事件

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)
  {
   this.Visible = false;
   return;
  }
 }
 base.WndProc(ref m);
}