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Directory.GetAccessControl Method (String)

Gets a DirectorySecurity object that encapsulates the access control list (ACL) entries for a specified directory.

Namespace: System.IO
Assembly: mscorlib (in mscorlib.dll)

'Declaration
Public Shared Function GetAccessControl ( _
	path As String _
) As DirectorySecurity
'Usage
Dim path As String
Dim returnValue As DirectorySecurity

returnValue = Directory.GetAccessControl(path)
public static DirectorySecurity GetAccessControl (
	String path
)
public static function GetAccessControl (
	path : String
) : DirectorySecurity
Not applicable.

Parameters

path

The path to a directory containing a DirectorySecurity object that describes the file's access control list (ACL) information.

Return Value

A DirectorySecurity object that encapsulates the access control rules for the file described by the path parameter.

Exception typeCondition

ArgumentNullException

The path parameter is a null reference (Nothing in Visual Basic).

IOException

An I/O error occurred while opening the directory.

PlatformNotSupportedException

The current operating system is not Microsoft Windows 2000 or later.

SystemException

The directory could not be found.

UnauthorizedAccessException

The path parameter specified a directory that is read-only.

-or-

This operation is not supported on the current platform.

-or-

The caller does not have the required permission.

Use the GetAccessControl method to retrieve the access control list (ACL) entries for a directory.

An ACL describes individuals and/or groups who have, or do not have, rights to specific actions on the given file or directory. For more information, see ACL Technology Overview and How to: Add or Remove an Access Control List Entry.

In NTFS environments, ReadAttributes and ReadExtendedAttributes are granted to the user if the user has ListDirectory rights on the parent folder. To deny ReadAttributes and ReadExtendedAttributes, deny ListDirectory on the parent directory.

The following code example uses the GetAccessControl and the SetAccessControl methods to add an access control list (ACL) entry and then remove an ACL entry from a directory. You must supply a valid user or group account to run this example.

Imports System
Imports System.IO
Imports System.Security.AccessControl



Module DirectoryExample

    Sub Main()
        Try
            Dim DirectoryName As String = "TestDirectory"

            Console.WriteLine("Adding access control entry for " + DirectoryName)

            ' Add the access control entry to the directory.
            AddDirectorySecurity(DirectoryName, "MYDOMAIN\MyAccount", FileSystemRights.ReadData, AccessControlType.Allow)

            Console.WriteLine("Removing access control entry from " + DirectoryName)

            ' Remove the access control entry from the directory.
            RemoveDirectorySecurity(DirectoryName, "MYDOMAIN\MyAccount", FileSystemRights.ReadData, AccessControlType.Allow)

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

        Console.ReadLine()

    End Sub


    ' Adds an ACL entry on the specified directory for the specified account.
    Sub AddDirectorySecurity(ByVal FileName As String, ByVal Account As String, ByVal Rights As FileSystemRights, ByVal ControlType As AccessControlType)
        ' Create a new DirectoryInfoobject.
        Dim dInfo As New DirectoryInfo(FileName)

        ' Get a DirectorySecurity object that represents the 
        ' current security settings.
        Dim dSecurity As DirectorySecurity = dInfo.GetAccessControl()

        ' Add the FileSystemAccessRule to the security settings. 
        dSecurity.AddAccessRule(New FileSystemAccessRule(Account, Rights, ControlType))

        ' Set the new access settings.
        dInfo.SetAccessControl(dSecurity)

    End Sub


    ' Removes an ACL entry on the specified directory for the specified account.
    Sub RemoveDirectorySecurity(ByVal FileName As String, ByVal Account As String, ByVal Rights As FileSystemRights, ByVal ControlType As AccessControlType)
        ' Create a new DirectoryInfo object.
        Dim dInfo As New DirectoryInfo(FileName)

        ' Get a DirectorySecurity object that represents the 
        ' current security settings.
        Dim dSecurity As DirectorySecurity = dInfo.GetAccessControl()

        ' Add the FileSystemAccessRule to the security settings. 
        dSecurity.RemoveAccessRule(New FileSystemAccessRule(Account, Rights, ControlType))

        ' Set the new access settings.
        dInfo.SetAccessControl(dSecurity)

    End Sub
End Module


  • FileIOPermission  for permission to enumerate access control list (ACL) for a directory. Associated enumerations: NoAccess , View Security action: Demand.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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