using system;
using system.runtime.interopservices;
然后是一系列的常量聲明： protected const int se_privilege_enabled = 0x2;
protected const int token_query = 0x8;
protected const int token_adjust_privileges = 0x20;
protected const string se_shutdown_name = "seshutdownprivilege";
protected const int ewx_logoff = 0x0;
protected const int ewx_shutdown = 0x1;
protected const int ewx_reboot = 0x2;
protected const int ewx_force = 0x4;
protected const int ewx_poweroff = 0x8;
protected const int ewx_forceifhung = 0x10;
定義luid結構，注意屬性： [structlayout(layoutkind.sequential, pack=1)]
protected struct luidstruct {
    public int count;
    public long luid;
    public int attr;
}
外部非托管dll的聲明： [dllimport("kernel32.dll", exactspelling=true)]
protected static extern intptr getcurrentprocess();

[dllimport("advapi32.dll", setlasterror=true)]
protected static extern bool openprocesstoken(intptr h, int acc, ref intptr phtok);

[dllimport("advapi32.dll", setlasterror=true)]
protected static extern bool lookupprivilegevalue(string host, string name, ref long pluid);

[dllimport("advapi32.dll", setlasterror=true, exactspelling=true)]
protected static extern bool adjusttokenprivileges(intptr htok, bool disall, ref luidstruct newst, int len, intptr prev, intptr relen);

[dllimport("user32.dll", setlasterror=true, exactspelling=true)]
protected static extern bool exitwindowsex(int flg, int rea);
在nt級的操作系統上，需要先通知windows系統即將關機，并且要獲得關機的權限

以下就是關機、重啟以及注銷的實現： protected static void doexitwindows(int flg) {
    luidstruct tp;
    intptr hproc = getcurrentprocess();
    intptr htok = intptr.zero;

    openprocesstoken(hproc, token_adjust_privileges | token_query, ref htok);
    tp.count = 1;
    tp.luid = 0;
    tp.attr = se_privilege_enabled;
    lookupprivilegevalue(null, se_shutdown_name, ref tp.luid);
    adjusttokenprivileges(htok, false, ref tp, 0, intptr.zero, intptr.zero);
    exitwindowsex(flg, 0);
}

public static void shutdown() {
    doexitwindows(ewx_shutdown);
}

public static void reboot() {
    doexitwindows(ewx_reboot | ewx_force);
}

public static void logoff() {
    doexitwindows(ewx_logoff);
}