Como: Adicionar ou remover entradas da lista de controle de acesso

Para adicionar ou remover entradas da lista de controle de acesso (ACL) de um arquivo ou diretório, obtenha o FileSecurity ou DirectorySecurity objeto do arquivo ou diretório. Modifique o objeto e aplique-o novamente ao arquivo ou diretório.

A partir de um ficheiro

1. Chame o FileSystemAclExtensions.GetAccessControl(FileInfo) (ou, para aplicativos do .NET Framework, FileInfo.GetAccessControl) método para obter um FileSecurity objeto que contém as entradas ACL atuais de um arquivo.

2. Adicione ou remova entradas de ACL do FileSecurity objeto obtido na etapa 1.

3. Para aplicar as alterações, passe o FileSecurity objeto para o FileSystemAclExtensions.SetAccessControl(FileInfo, FileSecurity) método (ou, para aplicativos do .NET Framework). FileInfo.SetAccessControl

A partir de um diretório

1. Chame o FileSystemAclExtensions.GetAccessControl(DirectoryInfo) método (ou, para aplicativos do .NET Framework, DirectoryInfo.GetAccessControl) para obter um DirectorySecurity objeto que contenha as entradas ACL atuais de um diretório.

2. Adicione ou remova entradas de ACL do DirectorySecurity objeto obtido na etapa 1.

3. Para aplicar as alterações, passe o DirectorySecurity objeto para o FileSystemAclExtensions.SetAccessControl(DirectoryInfo, DirectorySecurity) método (ou, para aplicativos do .NET Framework). DirectoryInfo.SetAccessControl

Exemplo

Você deve especificar uma conta de usuário ou grupo válida para executar este exemplo. O exemplo usa um FileInfo objeto. Use o mesmo procedimento para a DirectoryInfo classe.

using System;
using System.IO;
using System.Security.AccessControl;

    class FileExample
    {
        public static void Main()
        {
            try
            {
                string fileName = "test.xml";

                Console.WriteLine($"Adding access control entry for {fileName}");

                // Add the access control entry to the file.
                AddFileSecurity(fileName, @"DomainName\AccountName",
                    FileSystemRights.ReadData, AccessControlType.Allow);

                Console.WriteLine($"Removing access control entry from {fileName}");

                // Remove the access control entry from the file.
                RemoveFileSecurity(fileName, @"DomainName\AccountName",
                    FileSystemRights.ReadData, AccessControlType.Allow);

                Console.WriteLine("Done.");
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }

        // Adds an ACL entry on the specified file for the specified account.
        public static void AddFileSecurity(string fileName, string account,
            FileSystemRights rights, AccessControlType controlType)
        {
            FileInfo fileInfo = new(fileName);
            FileSecurity fSecurity = fileInfo.GetAccessControl();

            // Add the FileSystemAccessRule to the security settings.
            fSecurity.AddAccessRule(new FileSystemAccessRule(account,
                rights, controlType));

            // Set the new access settings.
            fileInfo.SetAccessControl(fSecurity);
        }

        // Removes an ACL entry on the specified file for the specified account.
        public static void RemoveFileSecurity(string fileName, string account,
            FileSystemRights rights, AccessControlType controlType)
        {
            FileInfo fileInfo = new(fileName);
            FileSecurity fSecurity = fileInfo.GetAccessControl();

            // Remove the FileSystemAccessRule from the security settings.
            fSecurity.RemoveAccessRule(new FileSystemAccessRule(account,
                rights, controlType));

            // Set the new access settings.
            fileInfo.SetAccessControl(fSecurity);
        }
}

Imports System.IO
Imports System.Security.AccessControl

Module FileExample

    Sub Main()
        Try
            Dim fileName As String = "test.xml"

            Console.WriteLine("Adding access control entry for " & fileName)

            ' Add the access control entry to the file.
            AddFileSecurity(fileName, "DomainName\AccountName",
                FileSystemRights.ReadData, AccessControlType.Allow)

            Console.WriteLine("Removing access control entry from " & fileName)

            ' Remove the access control entry from the file.
            RemoveFileSecurity(fileName, "DomainName\AccountName",
                FileSystemRights.ReadData, AccessControlType.Allow)

            Console.WriteLine("Done.")
        Catch e As Exception
            Console.WriteLine(e)
        End Try

    End Sub

    ' Adds an ACL entry on the specified file for the specified account.
    Sub AddFileSecurity(ByVal fileName As String, ByVal account As String,
        ByVal rights As FileSystemRights, ByVal controlType As AccessControlType)

        Dim fileInfo As New FileInfo(fileName)
        Dim fSecurity As FileSecurity = fileInfo.GetAccessControl()

        ' Add the FileSystemAccessRule to the security settings. 
        Dim accessRule As New FileSystemAccessRule(account, rights, controlType)

        fSecurity.AddAccessRule(accessRule)

        ' Set the new access settings.
        fileInfo.SetAccessControl(fSecurity)

    End Sub

    ' Removes an ACL entry on the specified file for the specified account.
    Sub RemoveFileSecurity(ByVal fileName As String, ByVal account As String,
        ByVal rights As FileSystemRights, ByVal controlType As AccessControlType)

        Dim fileInfo As New FileInfo(fileName)
        Dim fSecurity As FileSecurity = fileInfo.GetAccessControl()

        ' Remove the FileSystemAccessRule from the security settings. 
        fSecurity.RemoveAccessRule(New FileSystemAccessRule(account,
            rights, controlType))

        ' Set the new access settings.
        fileInfo.SetAccessControl(fSecurity)

    End Sub
End Module