FileInfo.SetAccessControl(FileSecurity) 方法

定義

命名空間:: System.IO

組件:: mscorlib.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

將 FileSecurity 物件所描述的訪問控制清單（ACL）專案套用至目前 FileInfo 物件所描述的檔案。

public:
 void SetAccessControl(System::Security::AccessControl::FileSecurity ^ fileSecurity);

public void SetAccessControl(System.Security.AccessControl.FileSecurity fileSecurity);

member this.SetAccessControl : System.Security.AccessControl.FileSecurity -> unit

Public Sub SetAccessControl (fileSecurity As FileSecurity)

參數

fileSecurity: FileSecurity

FileSecurity 物件，描述要套用至目前檔案的訪問控制清單（ACL）專案。

例外狀況

ArgumentNullException

fileSecurity 參數是 null。

SystemException

找不到或修改檔案。

UnauthorizedAccessException

目前的進程沒有開啟檔案的存取權。

範例

下列程式代碼範例會使用 GetAccessControl 方法和 SetAccessControl 方法來新增，然後從檔案中移除 ACL 專案。您必須提供有效的使用者或組帳戶，才能執行此範例。

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

namespace FileSystemExample
{
    class FileExample
    {
        public static void Main()
        {
            try
            {
                string FileName = "c:/test.xml";

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

                // Add the access control entry to the file.
                // Before compiling this snippet, change MyDomain to your
                // domain name and MyAccessAccount to the name
                // you use to access your domain.
                AddFileSecurity(FileName, @"MyDomain\MyAccessAccount", FileSystemRights.ReadData, AccessControlType.Allow);

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

                // Remove the access control entry from the file.
                // Before compiling this snippet, change MyDomain to your
                // domain name and MyAccessAccount to the name
                // you use to access your domain.
                RemoveFileSecurity(FileName, @"MyDomain\MyAccessAccount", 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
            )
        {
            // Create a new FileInfo object.
            FileInfo fInfo = new(FileName);

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

            // Add the FileSystemAccessRule to the security settings.
            fSecurity.AddAccessRule(new FileSystemAccessRule(Account,
                                                            Rights,
                                                            ControlType));

            // Set the new access settings.
            fInfo.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
            )
        {
            // Create a new FileInfo object.
            FileInfo fInfo = new(FileName);

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

            // Add the FileSystemAccessRule to the security settings.
            fSecurity.RemoveAccessRule(new FileSystemAccessRule(Account,
                                                            Rights,
                                                            ControlType));

            // Set the new access settings.
            fInfo.SetAccessControl(fSecurity);
        }
    }
}
//This code produces output similar to the following;
//results may vary based on the computer/file structure/etc.:
//
//Adding access control entry for c:\test.xml
//Removing access control entry from c:\test.xml
//Done.
//

Imports System.IO
Imports System.Security.AccessControl



Module FileExample

    Sub Main()
        Try
            Dim FileName As String = "c:\test.xml"

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

            ' Add the access control entry to the file.
            ' Before compiling this snippet, change MyDomain to your 
            ' domain name and MyAccessAccount to the name 
            ' you use to access your domain.
            AddFileSecurity(FileName, "MyDomain\\MyAccessAccount", FileSystemRights.ReadData, AccessControlType.Allow)

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

            ' Remove the access control entry from the file.
            ' Before compiling this snippet, change MyDomain to your 
            ' domain name and MyAccessAccount to the name 
            ' you use to access your domain.
            RemoveFileSecurity(FileName, "MyDomain\\MyAccessAccount", 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)
        ' Create a new FileInfo object.
        Dim fInfo As New FileInfo(FileName)

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

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

        ' Set the new access settings.
        fInfo.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)
        ' Create a new FileInfo object.
        Dim fInfo As New FileInfo(FileName)

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

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

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

    End Sub
End Module
'This code produces output similar to the following; 
'results may vary based on the computer/file structure/etc.:
'
'Adding access control entry for c:\test.xml
'Removing access control entry from c:\test.xml
'Done.
'

備註

SetAccessControl 方法會將訪問控制清單（ACL）專案套用至代表非繼承 ACL 清單的目前檔案。

每當您需要從檔案新增或移除 ACL 專案時，請使用 SetAccessControl 方法。

謹慎

為 fileSecurity 參數指定的 ACL 會取代檔案的現有 ACL。若要新增新用戶的許可權，請使用 GetAccessControl 方法來取得現有的 ACL、修改它，然後使用 SetAccessControl 將它套用回檔案。

ACL 描述具有或沒有指定檔案上特定動作許可權的個人和群組。如需詳細資訊，請參閱如何：新增或移除存取控制清單項目。

SetAccessControl 方法只會保存 FileSecurity 物件建立之後已修改的物件。如果 FileSecurity 物件尚未修改，則不會保存至檔案。因此，無法從某個檔案擷取 FileSecurity 物件，並將相同的物件重新套用至另一個檔案。

若要將 ACL 資訊從一個檔案複製到另一個檔案：

使用 GetAccessControl 方法，從來源檔案擷取 FileSecurity 物件。
為目的地檔案建立新的 FileSecurity 物件。
使用來源 FileSecurity 物件的 GetSecurityDescriptorBinaryForm 或 GetSecurityDescriptorSddlForm 方法來擷取 ACL 資訊。
使用 SetSecurityDescriptorBinaryForm 或 SetSecurityDescriptorSddlForm 方法，將步驟 3 中擷取的資訊複製到目的地 FileSecurity 物件。
使用 SetAccessControl 方法，將目的地 FileSecurity 物件設定為目的地檔案。

適用於

共用方式為

FileInfo.SetAccessControl(FileSecurity) 方法

定義

參數

例外狀況

範例

備註

適用於

意見反應