c# winform 让Form窗体上系统自带的红色关闭按钮失效，点击关闭变为隐藏

        #region   拦截Windows消息
        protected override void WndProc(ref   Message m)
        {
            const int WM_SYSCOMMAND = 0x0112;
            const int SC_CLOSE = 0xF060;
            if (m.Msg == WM_SYSCOMMAND && (int)m.WParam == SC_CLOSE)
            {
                //捕捉关闭窗体消息      
                //   User   clicked   close   button      
                this.Hide();
                return;
            }
            base.WndProc(ref   m);
        }
        #endregion