C#代码关闭Windows XP

　　    using System;
  using System.Runtime.InteropServices;
  
  class shoutdown{
   [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 Main()
   {
   Console.WriteLine("正在关闭计算机……");
   // 修改 EWX_SHUTDOWN 或者 EWX_LOGOFF, EWX_REBOOT等实现不同得功能。
   // 在XP下可以看到帮助信息，以得到不同得参数
   // SHUTDOWN /?
   DoExitWin(EWX_SHUTDOWN);
   }
  }

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