使用c#对windows进行关机、重启或注销

方法一：调用windows自带的shutdown.exe (缺点：会出现倒计时窗口)

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

shutdown参数含义：-r关闭并重启动此计算机；-f 强制运行的应用程序关闭而没有警告；-t 15 延时15秒
shutdown.exe的详细用法:
shutdown [-i | -l | -s | -r | -a] [-f] [-m //computername] [-t xx] [-c "comment"] [-d up:xx:yy]
没有参数 显示此消息(与 ? 相同)
-i 显示 GUI 界面，必须是第一个选项
-l 注销(不能与选项 -m 一起使用)
-s 关闭此计算机
-r 关闭并重启动此计算机
-a 放弃系统关机
-m //computername 远程计算机关机/重启动/放弃
-t xx 设置关闭的超时为 xx 秒
-c "comment" 关闭注释(最大 127 个字符)
-f 强制运行的应用程序关闭而没有警告
-d [u][p]:xx:yy 关闭原因代码
u 是用户代码
p 是一个计划的关闭代码
xx 是一个主要原因代码(小于 256 的正整数)
yy 是一个次要原因代码(小于 65536 的正整数)

方法二：调用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, //注销
 ShutDown = 0x01, //关机
 Reboot = 0x02, //重启
 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 = )]
 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>
 /// 关机、重启、注销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 = ;
 tp.Luid = ;
 tp.Attr = SE_PRIVILEGE_ENABLED;
 LookupPrivilegeValue(null, SE_SHUTDOWN_NAME, ref tp.Luid);
 AdjustTokenPrivileges(htok, false, ref tp, , IntPtr.Zero, IntPtr.Zero);
 ExitWindowsEx(flag, ShutdownReason.MajorOther);
 }

http://www.cnblogs.com/sosoft/p/3459826.html