API实现的 重启、关机、注销 .net类

namespace System {

/*

参考：//https://www.cnblogs.com/banhua/archive/2012/07/13/2590920.html

*/
    using System.Collections.Generic;
    using System.Text;
    using System.Runtime.InteropServices;

    class SystemUtil {
        [StructLayout(LayoutKind.Sequential,Pack = 1)]
        struct TokPriv1Luid {
            public int Count;
            public long Luid;
            public int Attr;
        }

        [DllImport("kernel32.dll",ExactSpelling = true)]
        static extern IntPtr GetCurrentProcess();

        [DllImport("advapi32.dll",ExactSpelling = true,SetLastError = true)]
        static extern bool OpenProcessToken(IntPtr h,int acc,ref IntPtr phtok);

        [DllImport("advapi32.dll",SetLastError = true)]
        static extern bool LookupPrivilegeValue(string host,string name,ref long pluid);

        [DllImport("advapi32.dll",ExactSpelling = true,SetLastError = true)]
        static extern bool AdjustTokenPrivileges(IntPtr htok,bool disall,ref TokPriv1Luid newst,int len,IntPtr prev,IntPtr relen);

        [DllImport("user32.dll",ExactSpelling = true,SetLastError = true)]
        static extern bool ExitWindowsEx(int flg,int rea);

        const int SE_PRIVILEGE_ENABLED = 0x00000002;
        const int TOKEN_QUERY = 0x00000008;
        const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;
        const string SE_SHUTDOWN_NAME = "SeShutdownPrivilege";
        const int EWX_LOGOFF = 0x00000000;
        const int EWX_SHUTDOWN = 0x00000001;
        const int EWX_REBOOT = 0x00000002;
        const int EWX_FORCE = 0x00000004;
        const int EWX_POWEROFF = 0x00000008;
        const int EWX_FORCEIFHUNG = 0x00000010;

        private static void DoExitWin(int flg) {
            bool b;
            TokPriv1Luid tp;
            IntPtr hproc = GetCurrentProcess();
            IntPtr htok = IntPtr.Zero;
            b = OpenProcessToken(hproc,TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY,ref htok);
            tp.Count = 1;
            tp.Luid = 0;
            tp.Attr = SE_PRIVILEGE_ENABLED;
            b = LookupPrivilegeValue(null,SE_SHUTDOWN_NAME,ref tp.Luid);
            b = AdjustTokenPrivileges(htok,false,ref tp,0,IntPtr.Zero,IntPtr.Zero);
            b = ExitWindowsEx(flg,0);
        }

        public static void Reboot() {
            DoExitWin(EWX_FORCE | EWX_REBOOT); //重启
        }

        public static void PowerOff() {
            DoExitWin(EWX_FORCE | EWX_POWEROFF);    //关机
        }

        public static void LogoOff() {
            DoExitWin(EWX_FORCE | EWX_LOGOFF);      //注销
        }

    }

}