帮我分析一下源代码代码

[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;这些代码是在c#关机的程序中摘取的,谁能帮忙分析一下啊 肯定给追加分的