SemaphoreSecurity.ResetAccessRule(SemaphoreAccessRule) Metode

Definisi

Ruang nama:

System.Security.AccessControl

Rakitan:

System.Threading.AccessControl.dll

Paket:

System.Threading.AccessControl v11.0.0-preview.7.26381.103

Sumber:

SemaphoreSecurity.cs

Menghapus semua aturan kontrol akses dengan pengguna yang sama dengan aturan yang ditentukan, terlepas dari AccessControlType, lalu menambahkan aturan yang ditentukan.

public:
 void ResetAccessRule(System::Security::AccessControl::SemaphoreAccessRule ^ rule);

public void ResetAccessRule(System.Security.AccessControl.SemaphoreAccessRule rule);

override this.ResetAccessRule : System.Security.AccessControl.SemaphoreAccessRule -> unit

Public Sub ResetAccessRule (rule As SemaphoreAccessRule)

Parameter

rule

SemaphoreAccessRule

yang SemaphoreAccessRule akan ditambahkan. Pengguna yang ditentukan oleh aturan ini menentukan aturan yang akan dihapus sebelum aturan ini ditambahkan.

Pengecualian

ArgumentNullException

rule adalah null.

Contoh

Contoh kode berikut menunjukkan bagaimana ResetAccessRule metode mengganti semua aturan untuk pengguna yang cocok dengan aturan yang ditentukan untuk kecocokan.

Contoh membuat SemaphoreSecurity objek dan menambahkan aturan yang mengizinkan dan menolak berbagai hak untuk pengguna saat ini. Contoh kemudian membuat aturan baru yang memungkinkan kontrol penuh pengguna saat ini, dan menggunakan ResetAccessRule metode untuk mengganti kedua aturan yang ada dengan aturan baru.

Note

Contoh ini tidak melampirkan objek keamanan ke Semaphore objek. Contoh yang melampirkan objek keamanan dapat ditemukan di Semaphore.GetAccessControl dan Semaphore.SetAccessControl.

using System;
using System.Threading;
using System.Security.AccessControl;
using System.Security.Principal;

public class Example
{
    public static void Main()
    {
        // Create a string representing the current user.
        string user = Environment.UserDomainName + "\\" + 
            Environment.UserName;

        // Create a security object that grants no access.
        SemaphoreSecurity mSec = new SemaphoreSecurity();

        // Add a rule that grants the current user the 
        // right to enter or release the semaphore and read the
        // permissions on the semaphore.
        SemaphoreAccessRule rule = new SemaphoreAccessRule(user, 
            SemaphoreRights.Synchronize | SemaphoreRights.Modify
                | SemaphoreRights.ReadPermissions, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule);

        // Add a rule that denies the current user the 
        // right to change permissions on the semaphore.
        rule = new SemaphoreAccessRule(user, 
            SemaphoreRights.ChangePermissions, 
            AccessControlType.Deny);
        mSec.AddAccessRule(rule);

        // Display the rules in the security object.
        ShowSecurity(mSec);

        // Create a rule that grants the current user 
        // the full control over the semaphore. Use the
        // ResetAccessRule method to replace both of 
        // the existing rules with the new rule. 
        rule = new SemaphoreAccessRule(user,
            SemaphoreRights.FullControl,
            AccessControlType.Allow);
        mSec.ResetAccessRule(rule);

        ShowSecurity(mSec);
    }

    private static void ShowSecurity(SemaphoreSecurity security)
    {
        Console.WriteLine("\r\nCurrent access rules:\r\n");

        foreach(SemaphoreAccessRule ar in 
            security.GetAccessRules(true, true, typeof(NTAccount)))
        {
            Console.WriteLine("        User: {0}", ar.IdentityReference);
            Console.WriteLine("        Type: {0}", ar.AccessControlType);
            Console.WriteLine("      Rights: {0}", ar.SemaphoreRights);
            Console.WriteLine();
        }
    }
}

/*This code example produces output similar to following:

Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions

        User: TestDomain\TestUser
        Type: Allow
      Rights: Modify, ReadPermissions, Synchronize


Current access rules:

        User: TestDomain\TestUser
        Type: Allow
      Rights: FullControl
 */

Imports System.Threading
Imports System.Security.AccessControl
Imports System.Security.Principal

Public Class Example

    Public Shared Sub Main()

        ' Create a string representing the current user.
        Dim user As String = Environment.UserDomainName _ 
            & "\" & Environment.UserName

        ' Create a security object that grants no access.
        Dim mSec As New SemaphoreSecurity()

        ' Add a rule that grants the current user the 
        ' right to enter or release the semaphore, and to 
        ' read its permissions.
        Dim rule As New SemaphoreAccessRule(user, _
            SemaphoreRights.Synchronize _
            Or SemaphoreRights.Modify _
            Or SemaphoreRights.ReadPermissions, _
            AccessControlType.Allow)
        mSec.AddAccessRule(rule)

        ' Add a rule that denies the current user the 
        ' right to change permissions on the semaphore.
        rule = New SemaphoreAccessRule(user, _
            SemaphoreRights.ChangePermissions, _
            AccessControlType.Deny)
        mSec.AddAccessRule(rule)

        ' Display the rules in the security object.
        ShowSecurity(mSec)

        ' Create a rule that grants the current user 
        ' the full control over the semaphore. Use the
        ' ResetAccessRule method to replace both of 
        ' the existing rules with the new rule. 
        rule = New SemaphoreAccessRule(user, _
            SemaphoreRights.FullControl, _
            AccessControlType.Allow)
        mSec.ResetAccessRule(rule)

        ShowSecurity(mSec)
        
    End Sub 

    Private Shared Sub ShowSecurity(ByVal security As SemaphoreSecurity)
        Console.WriteLine(vbCrLf & "Current access rules:" & vbCrLf)

        For Each ar As SemaphoreAccessRule In _
            security.GetAccessRules(True, True, GetType(NTAccount))

            Console.WriteLine("        User: {0}", ar.IdentityReference)
            Console.WriteLine("        Type: {0}", ar.AccessControlType)
            Console.WriteLine("      Rights: {0}", ar.SemaphoreRights)
            Console.WriteLine()
        Next

    End Sub
End Class 

'This code example produces output similar to following:
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Deny
'      Rights: ChangePermissions
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: Modify, ReadPermissions, Synchronize
'
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: FullControl

Keterangan

Jika tidak ada aturan akses yang penggunanya cocok dengan aturan yang ditentukan, rule ditambahkan.