In C #, how does one call Windows API to shut down !!!

Http://chenpeng.cnblogs.com/archive/2006/05/24/408313.html

Due to work needs, I have written a LAN multimedia software. it involves shutdown, logout, and restart operations on the computer. system APIs are required. at the beginning, I found a lot of information. there are still errors. later, relevant information is found in msdn. however, it is in English. there is a difficulty. modified multiple times. finally, I wrote it out. now I shut down the API that calls the system and deregister it. the source code of the restart operation is sent out. for your reference .... if any. please leave a message. I am convenient to correct!

using system;
using system. collections. generic;
using system. text;
using system. runtime. interopservices;
using system. threading;
namespace syslibrary
{< br> public class sysconfig
{< br> [structlayout (layoutkind. sequential, pack = 1)]
internal struct tokpriv1luid
{< br> 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 bool 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 );
Return OK;
}

Public void logoff ()
{
Doexitwin (ewx_logoff );
}

Public void reboot ()
{
Doexitwin (ewx_reboot );
}

Public void Shutdown ()
{
Doexitwin (ewx_shutdown );
}

}
}