SemaphoreSecurity.RemoveAccessRule(SemaphoreAccessRule) Método

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

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

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

Public Function RemoveAccessRule (rule As SemaphoreAccessRule) As Boolean

Parámetros

Devoluciones

Es true si se ha encontrado una regla compatible; en caso contrario, es false.

Excepciones

Ejemplos

En el ejemplo de código siguiente se muestra el uso del RemoveAccessRule método para quitar derechos de una Allow regla en un SemaphoreSecurity objeto . También muestra que se omiten otros derechos de rule .

En el ejemplo se crea un SemaphoreSecurity objeto y se agregan reglas que permiten y deniegan varios derechos para el usuario actual. Los derechos permitidos incluyen Modify, ReadPermissionsy Synchronize. A continuación, el ejemplo crea una nueva regla para el usuario actual, incluidos ReadPermissions los derechos y TakeOwnership , y usa esa regla con el RemoveAccessRule método para quitar ReadPermissions de la Allow regla en el SemaphoreSecurity objeto . El derecho extraño TakeOwnership en rule se omite.

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 right to read permissions on the semaphore, and
        // take ownership of the semaphore. Use this rule to 
        // remove the right to read permissions from the 
        // Allow rule for the current user. The inclusion 
        // of the right to take ownership has no effect.
        rule = new SemaphoreAccessRule(user, 
            SemaphoreRights.TakeOwnership | 
                SemaphoreRights.ReadPermissions, 
            AccessControlType.Allow);
        mSec.RemoveAccessRule(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: Deny
      Rights: ChangePermissions

        User: TestDomain\TestUser
        Type: Allow
      Rights: Modify, Synchronize
 */

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 right to read permissions on the semaphore, and
        ' take ownership of the semaphore. Use this rule to 
        ' remove the right to read permissions from the 
        ' Allow rule for the current user. The inclusion 
        ' of the right to take ownership has no effect.
        rule = New SemaphoreAccessRule(user, _
            SemaphoreRights.TakeOwnership _
            Or SemaphoreRights.ReadPermissions, _
            AccessControlType.Allow)
        mSec.RemoveAccessRule(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: Deny
'      Rights: ChangePermissions
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: Modify, Synchronize

Comentarios

SemaphoreSecurity Se busca una regla que tenga el mismo usuario y el mismo AccessControlType valor ruleque . Si no se encuentra ninguna regla de este tipo, no se realiza ninguna acción y el método devuelve false. Si se encuentran reglas de coincidencia, sus marcas de herencia y compatibilidad se comprueban por compatibilidad con las marcas especificadas en rule. Si no se encuentra ninguna regla compatible, no se realiza ninguna acción y el método devuelve false. Si se encuentra una regla con marcas compatibles, los derechos especificados en rule se quitan de la regla compatible y el método devuelve true. Si rule especifica los derechos no incluidos en la regla compatible, no se realiza ninguna acción con respecto a esos derechos. Si se quitan todos los derechos de la regla compatible, se quita toda la regla del objeto actual SemaphoreSecurity .

Se aplica a