EventWaitHandleSecurity.RemoveAccessRule(EventWaitHandleAccessRule) Méthode

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

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

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

Public Function RemoveAccessRule (rule As EventWaitHandleAccessRule) As Boolean

Paramètres

Retours

true si une règle compatible est trouvée ; sinon, false.

Exceptions

Exemples

L’exemple de code suivant illustre l’utilisation de la RemoveAccessRule méthode pour supprimer des droits d’une Allow règle dans un EventWaitHandleSecurity objet. Il montre également que les autres droits dans rule sont ignorés.

L’exemple crée un EventWaitHandleSecurity objet et ajoute des règles qui autorisent et refusent différents droits pour l’utilisateur actuel. Les droits autorisés incluent Modify, ReadPermissionset Synchronize. L’exemple crée ensuite une règle pour l’utilisateur actuel, y compris ReadPermissions les droits et TakeOwnership , et utilise cette règle avec la RemoveAccessRule méthode à supprimer ReadPermissions de la Allow règle dans l’objet EventWaitHandleSecurity . Le TakeOwnership droit dans rule est ignoré.

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.
        EventWaitHandleSecurity mSec = new EventWaitHandleSecurity();

        // Add a rule that grants the current user the 
        // right to wait on or signal the event and read the
        // permissions on the event.
        EventWaitHandleAccessRule rule = new EventWaitHandleAccessRule(user, 
            EventWaitHandleRights.Synchronize | EventWaitHandleRights.Modify
                | EventWaitHandleRights.ReadPermissions, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule);

        // Add a rule that denies the current user the 
        // right to change permissions on the event.
        rule = new EventWaitHandleAccessRule(user, 
            EventWaitHandleRights.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 event, and
        // take ownership of the event. 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 EventWaitHandleAccessRule(user, 
            EventWaitHandleRights.TakeOwnership | 
                EventWaitHandleRights.ReadPermissions, 
            AccessControlType.Allow);
        mSec.RemoveAccessRule(rule);

        ShowSecurity(mSec);
    }

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

        foreach(EventWaitHandleAccessRule 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.EventWaitHandleRights);
            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 EventWaitHandleSecurity()

        ' Add a rule that grants the current user the 
        ' right to wait on or signal the event, and to 
        ' read its permissions.
        Dim rule As New EventWaitHandleAccessRule(user, _
            EventWaitHandleRights.Synchronize _
            Or EventWaitHandleRights.Modify _
            Or EventWaitHandleRights.ReadPermissions, _
            AccessControlType.Allow)
        mSec.AddAccessRule(rule)

        ' Add a rule that denies the current user the 
        ' right to change permissions on the event.
        rule = New EventWaitHandleAccessRule(user, _
            EventWaitHandleRights.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 event, and
        ' take ownership of the event. 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 EventWaitHandleAccessRule(user, _
            EventWaitHandleRights.TakeOwnership _
            Or EventWaitHandleRights.ReadPermissions, _
            AccessControlType.Allow)
        mSec.RemoveAccessRule(rule)

        ShowSecurity(mSec)
        
    End Sub 

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

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

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

Remarques

La règle actuelle EventWaitHandleSecurity est recherchée qui a le même utilisateur et la même AccessControlType valeur que rule. Si aucune règle de ce type n’est trouvée, aucune action n’est effectuée et la méthode retourne false. Si des règles de correspondance sont trouvées, leurs indicateurs d’héritage et de compatibilité sont vérifiés pour la compatibilité avec les indicateurs spécifiés dans rule. Si aucune règle compatible n’est trouvée, aucune action n’est effectuée et la méthode retourne false. Si une règle avec des indicateurs compatibles est trouvée, les droits spécifiés dans rule sont supprimés de la règle compatible et la méthode retourne true. Si rule spécifie des droits non contenus dans la règle de compatibilité, aucune action n’est prise en ce qui concerne ces droits. Si tous les droits sont supprimés de la règle compatible, la règle entière est supprimée de l’objet actuel EventWaitHandleSecurity .

S’applique à