File.SetAccessControl(String, FileSecurity) 方法

参考

定义

命名空间:: System.IO

程序集:: mscorlib.dll

重要

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将 FileSecurity 对象描述的访问控制列表 (ACL) 项应用于指定的文件。

public:
 static void SetAccessControl(System::String ^ path, System::Security::AccessControl::FileSecurity ^ fileSecurity);

public static void SetAccessControl (string path, System.Security.AccessControl.FileSecurity fileSecurity);

static member SetAccessControl : string * System.Security.AccessControl.FileSecurity -> unit

Public Shared Sub SetAccessControl (path As String, fileSecurity As FileSecurity)

参数

path: String

从其中添加或移除访问控制列表 (ACL) 项的文件。

fileSecurity: FileSecurity

一个 FileSecurity 对象，描述要应用于 path 参数所描述的文件的 ACL 项。

例外

IOException

打开文件时发生 I/O 错误。

SEHException

path 参数为 null。

SystemException

找不到文件。

UnauthorizedAccessException

path 参数指定了一个只读文件。

- 或 -

当前平台不支持此操作。

- 或 -

path 参数指定了一个目录。

- 或 -

调用方没有所要求的权限。

ArgumentNullException

fileSecurity 参数为 null。

示例

下面的代码示例使用 GetAccessControl 和 SetAccessControl 方法从文件中添加和删除访问控制列表 (ACL) 条目。你必须提供有效的用户或组帐户以运行此示例。

using namespace System;
using namespace System::IO;
using namespace System::Security::AccessControl;

// Adds an ACL entry on the specified file for the specified account.

void AddFileSecurity(String^ fileName, String^ account, 
                        FileSystemRights rights, AccessControlType controlType)
{
    // Get a FileSecurity object that represents the 
    // current security settings.
    FileSecurity^ fSecurity = File::GetAccessControl(fileName);

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

    // Set the new access settings.
    File::SetAccessControl(fileName, fSecurity);
}

// Removes an ACL entry on the specified file for the specified account.

void RemoveFileSecurity(String^ fileName, String^ account, 
                        FileSystemRights rights, AccessControlType controlType)
{

    // Get a FileSecurity object that represents the 
    // current security settings.
    FileSecurity^ fSecurity = File::GetAccessControl(fileName);

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

    // Set the new access settings.
    File::SetAccessControl(fileName, fSecurity);
}

int main()
{
    try
    {
        String^ fileName = "test.xml";

        Console::WriteLine("Adding access control entry for " + fileName);

        // Add the access control entry to the file.
        AddFileSecurity(fileName, "MYDOMAIN\\MyAccount", 
            FileSystemRights::ReadData, AccessControlType::Allow);

        Console::WriteLine("Removing access control entry from " + fileName);

        // Remove the access control entry from the file.
        RemoveFileSecurity(fileName, "MYDOMAIN\\MyAccount", 
            FileSystemRights::ReadData, AccessControlType::Allow);

        Console::WriteLine("Done.");
    }
    catch (Exception^ ex)
    {
        Console::WriteLine(ex->Message);
    }
}

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)
        {

            // Get a FileSecurity object that represents the
            // current security settings.
            FileSecurity fSecurity = File.GetAccessControl(fileName);

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

            // Set the new access settings.
            File.SetAccessControl(fileName, 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)
        {

            // Get a FileSecurity object that represents the
            // current security settings.
            FileSecurity fSecurity = File.GetAccessControl(fileName);

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

            // Set the new access settings.
            File.SetAccessControl(fileName, fSecurity);
        }
    }
}

open System.IO
open System.Security.AccessControl

// Adds an ACL entry on the specified file for the specified account.
let addFileSecurity fileName (account: string) rights controlType =
    // Get a FileSecurity object that represents the
    // current security settings.
    let fSecurity = File.GetAccessControl fileName

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

    // Set the new access settings.
    File.SetAccessControl(fileName, fSecurity)

// Removes an ACL entry on the specified file for the specified account.
let removeFileSecurity fileName (account: string) rights controlType =
    // Get a FileSecurity object that represents the
    // current security settings.
    let fSecurity = File.GetAccessControl fileName

    // Remove the FileSystemAccessRule from the security settings.
    fSecurity.RemoveAccessRule(FileSystemAccessRule(account, rights, controlType))
    |> ignore

    // Set the new access settings.
    File.SetAccessControl(fileName, fSecurity)

let fileName = "test.xml"

printfn $"Adding access control entry for {fileName}"

// Add the access control entry to the file.
addFileSecurity fileName @"DomainName\AccountName" FileSystemRights.ReadData AccessControlType.Allow

printfn $"Removing access control entry from {fileName}"

// Remove the access control entry from the file.
removeFileSecurity fileName @"DomainName\AccountName" FileSystemRights.ReadData AccessControlType.Allow

printfn "Done."

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)
  
        ' Get a FileSecurity object that represents the 
        ' current security settings.
        Dim fSecurity As FileSecurity = File.GetAccessControl(fileName)

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

        fSecurity.AddAccessRule(accessRule)

        ' Set the new access settings.
        File.SetAccessControl(fileName, 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)

        ' Get a FileSecurity object that represents the 
        ' current security settings.
        Dim fSecurity As FileSecurity = File.GetAccessControl(fileName)

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

        ' Set the new access settings.
        File.SetAccessControl(fileName, fSecurity)

    End Sub
End Module

注解

方法 SetAccessControl 将访问控制列表 (ACL) 条目应用于表示非遗传 ACL 列表的文件。

注意

为 fileSecurity 参数指定的 ACL 将替换文件的现有 ACL。若要为新用户添加权限，请使用 GetAccessControl 方法获取现有 ACL，对其进行修改，然后使用 SetAccessControl 将其应用回文件。

ACL 描述对给定文件具有或没有特定操作权限的个人和/或组。有关详细信息，请参阅如何：添加或删除访问控制列表条目。

方法 SetAccessControl 仅 FileSecurity 保留创建对象后已修改的对象。 FileSecurity如果对象尚未修改，则不会将其保存到文件中。因此，无法从一个 FileSecurity 文件中检索对象并将同一对象重新应用到另一个文件。

将 ACL 信息从一个文件复制到另一个文件：

GetAccessControl使用方法从源文件中检索 FileSecurity 对象。
为目标文件创建新的 FileSecurity 对象。
GetSecurityDescriptorBinaryForm使用源FileSecurity对象的或 GetSecurityDescriptorSddlForm 方法检索 ACL 信息。
SetSecurityDescriptorBinaryForm使用或 SetSecurityDescriptorSddlForm 方法将步骤 3 中检索到的信息复制到目标FileSecurity对象。
使用 SetAccessControl 方法将目标FileSecurity对象设置为目标文件。

在 NTFS 环境中，ReadAttributes如果用户对父文件夹具有ListDirectory权限，则会向用户授予和 ReadExtendedAttributes 。若要拒绝 ReadAttributes 和 ReadExtendedAttributes，请在父目录上拒绝 ListDirectory 。

适用于

另请参阅

FileSystemWatcher

File.SetAccessControl(String, FileSecurity) 方法

定义

参数

例外

示例

注解

适用于

另请参阅

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