SemaphoreSecurity.RemoveAccessRuleSpecific(SemaphoreAccessRule) Metoda

Definicja

Wyszukuje regułę kontroli dostępu, która dokładnie pasuje do określonej reguły i, jeśli zostanie znaleziona, usunie ją.Searches for an access control rule that exactly matches the specified rule and, if found, removes it.

public:
 void RemoveAccessRuleSpecific(System::Security::AccessControl::SemaphoreAccessRule ^ rule);
public void RemoveAccessRuleSpecific (System.Security.AccessControl.SemaphoreAccessRule rule);
override this.RemoveAccessRuleSpecific : System.Security.AccessControl.SemaphoreAccessRule -> unit
Public Sub RemoveAccessRuleSpecific (rule As SemaphoreAccessRule)

Parametry

Wyjątki

rule to null.rule is null.

Przykłady

Poniższy przykład kodu pokazuje, że RemoveAccessRuleSpecific Metoda wymaga dokładnego dopasowania, aby usunąć regułę, i że reguły zezwalające na prawa i Odmów są niezależne od siebie.The following code example shows that the RemoveAccessRuleSpecific method requires an exact match in order to remove a rule, and that rules to allow and deny rights are independent of each other.

Przykład tworzy SemaphoreSecurity obiekt, dodaje reguły zezwalające i odmawiające różnych praw dla bieżącego użytkownika, a następnie scala dodatkowe prawa do Allow reguły dostępu.The example creates a SemaphoreSecurity object, adds rules that allow and deny various rights for the current user, and then merges additional rights into the Allow access rule. W przykładzie zostanie przekazana pierwotna Allow reguła do RemoveAccessRuleSpecific metody i zostaną wyświetlone wyniki, co oznacza, że nic nie zostanie usunięte.The example then passes the original Allow rule to the RemoveAccessRuleSpecific method, and displays the results, showing that nothing is deleted. Przykład następnie konstruuje regułę zgodną z Allow regułą w SemaphoreSecurity obiekcie i pomyślnie używa RemoveAccessRuleSpecific metody do usunięcia reguły.The example then constructs a rule that matches the Allow rule in the SemaphoreSecurity object, and successfully uses the RemoveAccessRuleSpecific method to remove the rule.

Uwaga

Ten przykład nie dołącza obiektu zabezpieczeń do Semaphore obiektu.This example does not attach the security object to a Semaphore object. Przykłady służące do dołączania obiektów zabezpieczeń znajdują się w Semaphore.GetAccessControl i Semaphore.SetAccessControl .Examples that attach security objects can be found in Semaphore.GetAccessControl and 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.
        SemaphoreAccessRule ruleA = new SemaphoreAccessRule(user, 
            SemaphoreRights.Synchronize | SemaphoreRights.Modify, 
            AccessControlType.Allow);
        mSec.AddAccessRule(ruleA);

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

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

        // Add a rule that allows the current user the 
        // right to read permissions on the semaphore. This rule
        // is merged with the existing Allow rule.
        rule = new SemaphoreAccessRule(user, 
            SemaphoreRights.ReadPermissions, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule);

        ShowSecurity(mSec);

        // Attempt to remove the original rule (granting
        // the right to enter or release the semaphore) with 
        // RemoveAccessRuleSpecific. The removal fails,
        // because the right to read the permissions on the 
        // semaphore has been added to the rule, so that it no 
        // longer matches the original rule.
        Console.WriteLine("Attempt to use RemoveAccessRuleSpecific on the original rule.");
        mSec.RemoveAccessRuleSpecific(ruleA);

        ShowSecurity(mSec);

        // Create a rule that grants the current user 
        // the right to enter or release the semaphore, and
        // to read permissions. Use this rule to remove
        // the Allow rule for the current user.
        Console.WriteLine("Use RemoveAccessRuleSpecific with the correct rights.");
        rule = new SemaphoreAccessRule(user, 
            SemaphoreRights.Synchronize | SemaphoreRights.Modify | 
                SemaphoreRights.ReadPermissions, 
            AccessControlType.Allow);
        mSec.RemoveAccessRuleSpecific(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, Synchronize


Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions

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

Attempt to use RemoveAccessRuleSpecific on the original rule.

Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions

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

Use RemoveAccessRuleSpecific with the correct rights.

Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions
 */
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.
        Dim ruleA As New SemaphoreAccessRule(user, _
            SemaphoreRights.Synchronize _
            Or SemaphoreRights.Modify, _
            AccessControlType.Allow)
        mSec.AddAccessRule(ruleA)

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

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

        ' Add a rule that allows the current user the 
        ' right to read permissions on the semaphore. This rule
        ' is merged with the existing Allow rule.
        rule = New SemaphoreAccessRule(user, _
            SemaphoreRights.ReadPermissions, _
            AccessControlType.Allow)
        mSec.AddAccessRule(rule)

        ShowSecurity(mSec)

        ' Attempt to remove the original rule (granting
        ' the right to enter or release the semaphore) with 
        ' RemoveAccessRuleSpecific. The removal fails,
        ' because the right to read the permissions on the 
        ' semaphore has been added to the rule, so that it no 
        ' longer matches the original rule.
        Console.WriteLine("Attempt to use RemoveAccessRuleSpecific on the original rule.")
        mSec.RemoveAccessRuleSpecific(ruleA)

        ShowSecurity(mSec)

        ' Create a rule that grants the current user 
        ' the right to enter or release the semaphore, and
        ' to read permissions. Use this rule to remove
        ' the Allow rule for the current user.
        Console.WriteLine("Use RemoveAccessRuleSpecific with the correct rights.")
        rule = New SemaphoreAccessRule(user, _
            SemaphoreRights.Synchronize _
            Or SemaphoreRights.Modify _
            Or SemaphoreRights.ReadPermissions, _
            AccessControlType.Allow)
        mSec.RemoveAccessRuleSpecific(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, Synchronize
'
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Deny
'      Rights: ChangePermissions
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: Modify, ReadPermissions, Synchronize
'
'Attempt to use RemoveAccessRuleSpecific on the original rule.
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Deny
'      Rights: ChangePermissions
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: Modify, ReadPermissions, Synchronize
'
'Use RemoveAccessRuleSpecific with the correct rights.
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Deny
'      Rights: ChangePermissions

Uwagi

Reguła jest usuwana tylko wtedy, gdy dokładnie pasuje rule do wszystkich szczegółów, w tym flag.The rule is removed only if it exactly matches rule in all details, including flags. Inne reguły z tym samym użytkownikiem i AccessControlType nie wpływają na nie.Other rules with the same user and AccessControlType are not affected.

Ważne

Reguła reprezentuje jeden lub więcej z podstawowych wpisów kontroli dostępu (ACE), a te wpisy są podzielone lub łączone w miarę potrzeb podczas modyfikowania reguł zabezpieczeń dostępu dla użytkownika.A rule represents one or more underlying access control entries (ACE), and these entries are split or combined as necessary when you modify the access security rules for a user. W ten sposób reguła może już nie istnieć w konkretnym formularzu, gdy została dodana, a w takim przypadku RemoveAccessRuleSpecific Metoda nie może go usunąć.Thus, a rule might no longer exist in the specific form it had when it was added, and in that case the RemoveAccessRuleSpecific method cannot remove it.

Dotyczy