c calls api to control windows shutdown example of can restart and logout

Method 1: call windows's own shutdown.exe (disadvantage: a countdown window appears)

System.Diagnostics.Process.Start("shutdown.exe", "-r -f -t 15");

shutdown parameter meaning: -r shut down and restart this computer; -f forces running applications to shut down without warning; -t 15 delayed 15shutdown.
shutdown [-i | -l | -s | -r | -a] [-f] [-m //computername] [-t xx] [-c "comment"] [-d up:xx:yy]
No argument displays this message (with? The same)
-i displays the GUI interface, must be the first option
-l logout (cannot be used with option -m 1)
-s shut down this computer
-r shut down and restart this computer
- a abandon system shutdown
-m //computername remote computer shutdown/restart/abandon
-t xx sets the timeout off to xx seconds
-c "comment" close comment (Max. 127 characters)
-f forces running applications to shut down without warning
-d [u][p]:xx:yy close reason code
u is user code
p is the shutdown code for a plan
xx is one of the main reason codes (positive integers less than 256)
yy is a secondary cause code (a positive integer less than 65536)

Method 2: call API

private const int SE_PRIVILEGE_ENABLED = 0x00000002;
private const int TOKEN_QUERY = 0x00000008;
private const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;
private const string SE_SHUTDOWN_NAME = "SeShutdownPrivilege";
[Flags]
public enum ExitWindows : uint
{
LogOff = 0x00, // The cancellation 
ShutDown = 0x01, // To turn it off 
Reboot = 0x02, // restart 
Force = 0x04,
PowerOff = 0x08,
ForceIfHung = 0x10
}
[Flags]
private enum ShutdownReason : uint
{
MajorApplication = 0x00040000,
MajorHardware = 0x00010000,
MajorLegacyApi = 0x00070000,
MajorOperatingSystem = 0x00020000,
MajorOther = 0x00000000,
MajorPower = 0x00060000,
MajorSoftware = 0x00030000,
MajorSystem = 0x00050000,
MinorBlueScreen = 0x0000000F,
MinorCordUnplugged = 0x0000000b,
MinorDisk = 0x00000007,
MinorEnvironment = 0x0000000c,
MinorHardwareDriver = 0x0000000d,
MinorHotfix = 0x00000011,
MinorHung = 0x00000005,
MinorInstallation = 0x00000002,
MinorMaintenance = 0x00000001,
MinorMMC = 0x00000019,
MinorNetworkConnectivity = 0x00000014,
MinorNetworkCard = 0x00000009,
MinorOther = 0x00000000,
MinorOtherDriver = 0x0000000e,
MinorPowerSupply = 0x0000000a,
MinorProcessor = 0x00000008,
MinorReconfig = 0x00000004,
MinorSecurity = 0x00000013,
MinorSecurityFix = 0x00000012,
MinorSecurityFixUninstall = 0x00000018,
MinorServicePack = 0x00000010,
MinorServicePackUninstall = 0x00000016,
MinorTermSrv = 0x00000020,
MinorUnstable = 0x00000006,
MinorUpgrade = 0x00000003,
MinorWMI = 0x00000015,
FlagUserDefined = 0x40000000,
FlagPlanned = 0x80000000
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
private struct TokPriv1Luid 
{ 
public int Count;
public long Luid;
public int Attr;
}
[DllImport("kernel32.dll", ExactSpelling = true)]
private static extern IntPtr GetCurrentProcess();
[DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
private static extern bool OpenProcessToken(IntPtr h, int acc, ref IntPtr phtok);
[DllImport("advapi32.dll", SetLastError = true)]
private static extern bool LookupPrivilegeValue(string host, string name, ref long pluid);
[DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
private static extern bool AdjustTokenPrivileges(IntPtr htok, bool disall, ref TokPriv1Luid newst, int len, IntPtr prev, IntPtr relen);
[DllImport("user32.dll")]
private static extern bool ExitWindowsEx(ExitWindows uFlags, ShutdownReason dwReason);
/// <summary>
///  Shut down, restart, log off windows
/// </summary>
/// <param name="flag"></param>
public static void DoExitWindows(ExitWindows flag)
{
TokPriv1Luid 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(flag, ShutdownReason.MajorOther);
}