MutexSecurity.ResetAccessRule(MutexAccessRule) Método

Definición

Espacio de nombres:

System.Security.AccessControl

Ensamblado:

System.Threading.AccessControl.dll

Paquete:

System.Threading.AccessControl v8.0.0

Source:

MutexSecurity.cs

Quita todas las reglas de control de acceso con el mismo usuario que la regla especificada, independientemente de AccessControlType, y, a continuación, agrega la regla especificada.

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

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

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

Public Sub ResetAccessRule (rule As MutexAccessRule)

Parámetros

rule

MutexAccessRule

MutexAccessRule que se va a agregar. El usuario especificado por esta regla determina las reglas que se van a quitar antes de agregar esta regla.

Excepciones

ArgumentNullException

rule es null.

Ejemplos

En el ejemplo de código siguiente se muestra cómo el ResetAccessRule método reemplaza todas las reglas para el usuario coincidente con la regla especificada para la coincidencia.

En el ejemplo se crea un MutexSecurity objeto y se agregan reglas que permiten y deniegan varios derechos para el usuario actual. A continuación, el ejemplo crea una nueva regla que permite el control total del usuario actual y usa el ResetAccessRule método para reemplazar ambas reglas existentes por la nueva regla.

Nota

En este ejemplo no se adjunta el objeto de seguridad a un Mutex objeto . Ejemplos que adjuntan objetos de seguridad se pueden encontrar en Mutex.GetAccessControl y Mutex.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.
        MutexSecurity mSec = new MutexSecurity();

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

        // Add a rule that denies the current user the 
        // right to change permissions on the mutex.
        rule = new MutexAccessRule(user, 
            MutexRights.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 mutex. Use the
        // ResetAccessRule method to replace both of 
        // the existing rules with the new rule. 
        rule = new MutexAccessRule(user,
            MutexRights.FullControl,
            AccessControlType.Allow);
        mSec.ResetAccessRule(rule);

        ShowSecurity(mSec);
    }

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

        foreach(MutexAccessRule 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.MutexRights);
            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 MutexSecurity()

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

        ' Add a rule that denies the current user the 
        ' right to change permissions on the mutex.
        rule = New MutexAccessRule(user, _
            MutexRights.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 mutex. Use the
        ' ResetAccessRule method to replace both of 
        ' the existing rules with the new rule. 
        rule = New MutexAccessRule(user, _
            MutexRights.FullControl, _
            AccessControlType.Allow)
        mSec.ResetAccessRule(rule)

        ShowSecurity(mSec)
        
    End Sub 

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

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

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

Comentarios

Si no hay ninguna regla de acceso cuyo usuario coincida con la regla especificada, rule se agrega.