File Security

using System.Text;
using System;
using System.IO;
using System.Runtime.CompilerServices;
using System.Management;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Security.AccessControl;
using System.Security.Principal;


static void Main(string[] args)
{
    SecurityFileDemo(); 
    PrintLog();
}

static void SecurityFileDemo()
{
    string file = "securitytest.txt";
    File.WriteAllText(file, "File Security test.");

    var sid = new SecurityIdentifier(WellKnownSidType.BuiltinUsersSid, null);
    string usersAccount = sid.Translate(typeof(NTAccount)).ToString();
    Console.WriteLine($"User:{usersAccount}");
    FileSecurity sec=new FileSecurity(file,AccessControlSections.Owner|AccessControlSections.Group|
        AccessControlSections.Access);
    Console.WriteLine("After Create:");
    ShowSecurity(sec);
    sec.ModifyAccessRule(AccessControlModification.Add, new FileSystemAccessRule(usersAccount, FileSystemRights.Write,
        AccessControlType.Allow), out bool modified);
    Console.WriteLine("\n\n\nAfter Modify:");
    ShowSecurity(sec);
}

static void ShowSecurity(FileSecurity sec)
{
    AuthorizationRuleCollection rulesCollection=sec.GetAccessRules(true,true,typeof(NTAccount));
    foreach(FileSystemAccessRule fsar in rulesCollection.Cast<FileSystemAccessRule>().
        OrderBy(x=>x.IdentityReference.Value))
    {
        Console.WriteLine($"IdentityReference.Value:{fsar.IdentityReference.Value}," +
            $"FileSystemRights:{fsar.FileSystemRights},AccessControlType:{fsar.AccessControlType}");
    }
}

static void PrintLog([CallerLineNumber] int lineNum = 0, [CallerMemberName] string func = null,
[CallerFilePath] string file=null)
{
Console.WriteLine($"{DateTime.Now.ToString("O")},line:{lineNum},func:{func},file:{file}");
}