实现关机、重启、注销

       
        //实现关机,重启,注销
        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        internal struct TokPriv1Luid
        {
            public int Count;
            public long Luid;
            public int Attr;
        }

        //[DllImport]允许.NET调用任意非托管的C/C++基类库,包括操作系统中的API.但与基于COM的软件通信时，[DLLImport]不能使用.
        [DllImport("kernel32.dll", ExactSpelling = true)]
        internal static extern IntPtr GetCurrentProcess();

        [DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
        internal static extern bool OpenProcessToken(IntPtr h, int acc, ref   IntPtr phtok);

        [DllImport("advapi32.dll", SetLastError = true)]
        internal static extern bool LookupPrivilegeValue(string host, string name, ref   long pluid);

        [DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
        internal static extern bool AdjustTokenPrivileges(IntPtr htok, bool disall,
        ref   TokPriv1Luid newst, int len, IntPtr prev, IntPtr relen);

        [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
        internal static extern bool ExitWindowsEx(int flg, int rea);

        internal const int SE_PRIVILEGE_ENABLED = 0x00000002;
        internal const int TOKEN_QUERY = 0x00000008;
        internal const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;
        internal const string SE_SHUTDOWN_NAME = "SeShutdownPrivilege";
        internal const int EWX_LOGOFF = 0x00000000;
        internal const int EWX_SHUTDOWN = 0x00000001;
        internal const int EWX_REBOOT = 0x00000002;
        internal const int EWX_FORCE = 0x00000004;
        internal const int EWX_POWEROFF = 0x00000008;
        internal const int EWX_FORCEIFHUNG = 0x00000010;

        private static void DoExitWin(int flg)
        {
            bool ok;
            TokPriv1Luid tp;
            IntPtr hproc = GetCurrentProcess();
            IntPtr htok = IntPtr.Zero;
            ok = OpenProcessToken(hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, ref   htok);
            tp.Count = 1;
            tp.Luid = 0;
            tp.Attr = SE_PRIVILEGE_ENABLED;
            ok = LookupPrivilegeValue(null, SE_SHUTDOWN_NAME, ref   tp.Luid);
            ok = AdjustTokenPrivileges(htok, false, ref   tp, 0, IntPtr.Zero, IntPtr.Zero);
            ok = ExitWindowsEx(flg, 0);
        }

        //重启
        public void Reboot()
        {
            DoExitWin(EWX_FORCE | EWX_REBOOT);
        }

        //关机
        public void PowerOff()
        {
            DoExitWin(EWX_FORCE | EWX_POWEROFF);
        }

        //注销
        public static void LogoOff()
        {
            DoExitWin(EWX_FORCE | EWX_LOGOFF);
        }



        }