C#中屏蔽ALT+F4

        /// <summary>

        /// 屏蔽Alt+F4

        /// </summary>

        /// <param name="m">要处理的 Windows </param>

        protected override void WndProc(ref Message m)

        {

            const int WM_SYSCOMMAND = 0x0112;

            const int SC_CLOSE = 0xF060;

            if (m.Msg == WM_SYSCOMMAND)

            {

                if (m.Msg == WM_SYSCOMMAND)

                {

                    if ((m.WParam.ToInt32() & 0xFFF0) == SC_CLOSE

                            && m.LParam.ToInt32() == 0)

                    {

                        return;

                    }

                }

            }



            base.WndProc(ref m);

        }