C#实现关机、重启。注销的代码

[StructLayout(LayoutKind.Sequential, Pack = 1)]
 
        internal struct TokPriv1Luid
 
        {
 
            public int Count;
 
            public long Luid;
 
            public int Attr;
 
        }
 
        [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);
 
        }
 
        private void button2_Click(object sender, EventArgs e)
 
        {
 
            //此代码实现重启功能
 
            DoExitWin(EWX_REBOOT);
 
        }
 
        private void button3_Click(object sender, EventArgs e)
 
        {
 
             //此代码实现注销功能
 
            DoExitWin(EWX_LOGOFF);
 
        }
 
        private void button1_Click_1(object sender, EventArgs e)
 
        {
 
             //此代码实现关机功能
 
            DoExitWin(EWX_SHUTDOWN);
 
        }