C#实现代码关闭计算机

方法一、

using System.Runtime.InteropServices;
 
[DllImport("msvcrt.dll")]
static extern int system(string cmd);
 
调用
system("shutdown -s 搜索-t 0");

方法二、

Process myProcess = new Process();            
myProcess.StartInfo.FileName = "cmd.exe";            
myProcess.StartInfo.UseShellExecute = false;            
myProcess.StartInfo.RedirectStandardInput = true;            
myProcess.StartInfo.RedirectStandardOutput = true;      
myProcess.StartInfo.RedirectStandardError = true;          
myProcess.StartInfo.CreateNoWindow = true;            
myProcess.Start();            
myProcess.StandardInput.WriteLine("shutdown -s -t 0");

方法三、

#region 关机用到的API代码

        [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;//注销

        internal const int EWX_SHUTDOWN = 0x00000001;//关机

        internal const int EWX_REBOOT = 0x00000002;//重新启动

        internal const int EWX_FORCE = 0x00000004;//强制注销

        internal const int EWX_POWEROFF = 0x00000008;//强制关机

        internal const int EWX_FORCEIFHUNG = 0x00000010;

        private 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);
        }

        #endregion
    }
}