C# 調用系統關機、重啟、登出的類

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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Runtime.InteropServices;namespace WorkHelper{    class ShutDown    {        [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);        }        public static void Reboot()        {            DoExitWin(EWX_FORCE | EWX_REBOOT); //重啟        }        public static void PowerOff()        {            DoExitWin(EWX_FORCE | EWX_POWEROFF);    //關機        }        public static void LogoOff()        {            DoExitWin(EWX_FORCE | EWX_LOGOFF);      //登出        }    }}