C# 调用系统关机、重启、注销的类

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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); //重启         }           public static void PowerOff()         {             DoExitWin(EWX_FORCE | EWX_POWEROFF);    //关机         }           public static void LogoOff()         {             DoExitWin(EWX_FORCE | EWX_LOGOFF);      //注销         }       } }