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C#调用windows api关机代码
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 keleyi.com
  // SHUTDOWN /?
  DoExitWin(EWX_SHUTDOWN);
  }
}
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