FileSystemSecurity.RemoveAccessRule(FileSystemAccessRule) Metode

Definisi

Ruang nama:

System.Security.AccessControl

Rakitan:

System.IO.FileSystem.AccessControl.dll

Menghapus semua izin perkenankan atau tolak kontrol akses (ACL) yang cocok dari file atau direktori saat ini.

public:
 bool RemoveAccessRule(System::Security::AccessControl::FileSystemAccessRule ^ rule);

public bool RemoveAccessRule (System.Security.AccessControl.FileSystemAccessRule rule);

override this.RemoveAccessRule : System.Security.AccessControl.FileSystemAccessRule -> bool

Public Function RemoveAccessRule (rule As FileSystemAccessRule) As Boolean

Parameter

rule

FileSystemAccessRule

Objek FileSystemAccessRule yang mewakili izin daftar kontrol akses (ACL) untuk dihapus dari file atau direktori.

Mengembalikan

Boolean

true jika aturan akses dihapus; jika tidak, false.

Pengecualian

ArgumentNullException

Parameter rulenull.

Contoh

Contoh kode berikut menggunakan kelas FileSecurity untuk ditambahkan lalu menghapus entri daftar kontrol akses (ACL) dari file. Anda harus menyediakan akun pengguna atau grup yang valid untuk menjalankan contoh ini.

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

namespace FileSystemExample
{
    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

Keterangan

Metode RemoveAccessRule menghapus semua aturan akses Deny yang cocok atau semua aturan akses Allow yang cocok dari objek FileSystemSecurity saat ini. Misalnya, Anda dapat menggunakan metode ini untuk menghapus semua aturan akses Deny untuk pengguna dengan meneruskan objek FileSystemAccessRule yang dibuat menggunakan nilai Deny, nilai Read, dan akun pengguna. Saat Anda melakukan ini, metode RemoveAccessRule menghapus aturan tolak yang menentukan nilai Read atau nilai Write.

Gunakan metode dependen implementasi .NET berikut untuk menambahkan atau mengambil informasi ACL dari file:

Implementasi .NET	Menambahkan aturan	Mengambil aturan
.JARING	FileSystemAclExtensions.SetAccessControl(FileInfo, FileSecurity)	FileSystemAclExtensions.GetAccessControl(FileInfo)
.NET Framework	FileInfo.SetAccessControl(FileSecurity)	FileInfo.GetAccessControl()

Saat Anda menambahkan aturan akses tanpa mengatur bendera Synchronize, bendera Synchronize akan ditambahkan secara otomatis ke aturan Anda. Jika Anda menghapus aturan nanti tanpa menentukan bendera Synchronize, bendera akan dihapus secara otomatis.