Gör så här: Lägga till eller ta bort poster i åtkomstkontrollistan

Om du vill lägga till eller ta bort åtkomstkontrollistposter (ACL) från en fil eller katalog hämtar FileSecurity du objektet eller DirectorySecurity från filen eller katalogen. Ändra objektet och tillämpa det sedan på filen eller katalogen igen.

Från en fil

1. FileSystemAclExtensions.GetAccessControl(FileInfo) Anropa metoden (eller, för .NET Framework-appar, FileInfo.GetAccessControl) för att hämta ett FileSecurity objekt som innehåller de aktuella ACL-posterna i en fil.

2. Lägg till eller ta bort ACL-poster från objektet FileSecurity som hämtades i steg 1.

3. Om du vill tillämpa ändringarna skickar du FileSecurity objektet till FileSystemAclExtensions.SetAccessControl(FileInfo, FileSecurity) metoden (eller, för .NET Framework-appar, FileInfo.SetAccessControl).

Från en katalog

1. FileSystemAclExtensions.GetAccessControl(DirectoryInfo) Anropa metoden (eller för .NET Framework-appar, DirectoryInfo.GetAccessControl) för att hämta ett DirectorySecurity objekt som innehåller de aktuella ACL-posterna i en katalog.

2. Lägg till eller ta bort ACL-poster från objektet DirectorySecurity som hämtades i steg 1.

3. Om du vill tillämpa ändringarna skickar du DirectorySecurity objektet till FileSystemAclExtensions.SetAccessControl(DirectoryInfo, DirectorySecurity) metoden (eller, för .NET Framework-appar, DirectoryInfo.SetAccessControl).

Exempel

Du måste ange ett giltigt användar- eller gruppkonto för att kunna köra det här exemplet. I exemplet används ett FileInfo objekt. Använd samma procedur för DirectoryInfo klassen.

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