Csharp/CSharp Tutorial/File Directory Stream/File Access Rule

Add file access rule

using System;
using System.IO;
using System.Security.AccessControl;
static class MainClass
{
    static void Main(string[] args)
    {
        FileStream stream = null;
        string fileName = "c:\\Test.txt";
        // Deny "Everyone" access to the file
        FileSecurity fSecurity = File.GetAccessControl(fileName);
        fSecurity.AddAccessRule(new FileSystemAccessRule("Everyone",FileSystemRights.Read, AccessControlType.Deny));
        File.SetAccessControl(fileName, fSecurity);
        // Attempt to access file.
        try
        {
            stream = new FileStream(fileName, FileMode.Create);
        }
        catch (Exception ex)
        {
            Console.WriteLine("Exception thrown: ");
            Console.WriteLine(ex.ToString());
        }
        finally
        {
            stream.Close();
            stream.Dispose();
        }
    }
}

Creating a new file with specific access rule

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.IsolatedStorage;
using System.Net;
using System.Net.Sockets;
using System.Reflection;
using System.Security;
using System.Security.AccessControl;
using System.Security.Policy;
using System.Security.Permissions;
using System.Security.Principal;
using System.Text;
public class MainClass
{
    public static void Main()
    {
        string fileName = "c:\\test.txt";
        FileSecurity acl = new FileSecurity();
        acl.AddAccessRule(new FileSystemAccessRule(WindowsIdentity.GetCurrent().Name,
            FileSystemRights.CreateFiles | FileSystemRights.Modify | FileSystemRights.Delete,
            AccessControlType.Allow));
        using (FileStream file = File.Open(fileName, FileMode.OpenOrCreate))
        {
            
        }
    }
}

Set File access rule

using System;
using System.IO;
using System.Security.AccessControl;
static class MainClass
{
    static void Main(string[] args)
    {
        FileStream stream = null;
        string fileName = "c:\\test.txt";
        // Deny "Everyone" access to the file
        FileSecurity fSecurity = File.GetAccessControl(fileName);
        fSecurity.ResetAccessRule(new FileSystemAccessRule("Everyone",FileSystemRights.Read, AccessControlType.Deny));
        File.SetAccessControl(fileName, fSecurity);
        // Attempt to access file.
        try
        {
            stream = new FileStream(fileName, FileMode.Create);
        }
        catch (Exception ex)
        {
            Console.WriteLine("Exception thrown: ");
            Console.WriteLine(ex.ToString());
        }
        finally
        {
            stream.Close();
            stream.Dispose();
        }
    }
}