EventWaitHandleSecurity.RemoveAccessRuleSpecific Méthode
Définition
Important
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Recherche une règle de contrôle d'accès qui correspond exactement à la règle spécifiée et, si une telle règle est trouvée, la supprime.
public:
void RemoveAccessRuleSpecific(System::Security::AccessControl::EventWaitHandleAccessRule ^ rule);public void RemoveAccessRuleSpecific (System.Security.AccessControl.EventWaitHandleAccessRule rule);override this.RemoveAccessRuleSpecific : System.Security.AccessControl.EventWaitHandleAccessRule -> unitPublic Sub RemoveAccessRuleSpecific (rule As EventWaitHandleAccessRule)Paramètres
EventWaitHandleAccessRule à supprimer.
Exceptions
rule a la valeur null.
Exemples
L’exemple de code suivant montre que la RemoveAccessRuleSpecific méthode nécessite une correspondance exacte pour supprimer une règle, et que les règles permettant d’autoriser et de refuser des droits sont indépendantes les unes des autres.
L’exemple crée un EventWaitHandleSecurity objet, ajoute des règles qui autorisent et refusent différents droits pour l’utilisateur actuel, puis fusionne des droits supplémentaires dans la règle d’accès Allow . L’exemple passe ensuite la règle d’origine Allow à la RemoveAccessRuleSpecific méthode et affiche les résultats, indiquant que rien n’est supprimé. L’exemple construit ensuite une règle qui correspond à la Allow règle dans l’objet EventWaitHandleSecurity et utilise correctement la RemoveAccessRuleSpecific méthode pour supprimer la règle.
Notes
Cet exemple n’attache pas l’objet de sécurité à un EventWaitHandle objet . Vous trouverez des exemples qui attachent des objets de sécurité dans EventWaitHandle.GetAccessControl et EventWaitHandle.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.
EventWaitHandleSecurity mSec = new EventWaitHandleSecurity();
// Add a rule that grants the current user the
// right to wait on or signal the event.
EventWaitHandleAccessRule ruleA = new EventWaitHandleAccessRule(user,
EventWaitHandleRights.Synchronize | EventWaitHandleRights.Modify,
AccessControlType.Allow);
mSec.AddAccessRule(ruleA);
// Add a rule that denies the current user the
// right to change permissions on the event.
EventWaitHandleAccessRule rule = new EventWaitHandleAccessRule(user,
EventWaitHandleRights.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 event. This rule
// is merged with the existing Allow rule.
rule = new EventWaitHandleAccessRule(user,
EventWaitHandleRights.ReadPermissions,
AccessControlType.Allow);
mSec.AddAccessRule(rule);
ShowSecurity(mSec);
// Attempt to remove the original rule (granting
// the right to wait on or signal the event) with
// RemoveAccessRuleSpecific. The removal fails,
// because the right to read the permissions on the
// event 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 wait on or signal the event, 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 EventWaitHandleAccessRule(user,
EventWaitHandleRights.Synchronize | EventWaitHandleRights.Modify |
EventWaitHandleRights.ReadPermissions,
AccessControlType.Allow);
mSec.RemoveAccessRuleSpecific(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, 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 EventWaitHandleSecurity()
' Add a rule that grants the current user the
' right to wait on or signal the event.
Dim ruleA As New EventWaitHandleAccessRule(user, _
EventWaitHandleRights.Synchronize _
Or EventWaitHandleRights.Modify, _
AccessControlType.Allow)
mSec.AddAccessRule(ruleA)
' Add a rule that denies the current user the
' right to change permissions on the event.
Dim rule As New EventWaitHandleAccessRule(user, _
EventWaitHandleRights.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 event. This rule
' is merged with the existing Allow rule.
rule = New EventWaitHandleAccessRule(user, _
EventWaitHandleRights.ReadPermissions, _
AccessControlType.Allow)
mSec.AddAccessRule(rule)
ShowSecurity(mSec)
' Attempt to remove the original rule (granting
' the right to wait on or signal the event) with
' RemoveAccessRuleSpecific. The removal fails,
' because the right to read the permissions on the
' event 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 wait on or signal the event, 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 EventWaitHandleAccessRule(user, _
EventWaitHandleRights.Synchronize _
Or EventWaitHandleRights.Modify _
Or EventWaitHandleRights.ReadPermissions, _
AccessControlType.Allow)
mSec.RemoveAccessRuleSpecific(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, 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
Remarques
La règle est supprimée uniquement si elle correspond rule exactement dans tous les détails, y compris les indicateurs. Les autres règles avec le même utilisateur et AccessControlType ne sont pas affectées.
Important
Une règle représente une ou plusieurs entrées de contrôle d’accès sous-jacentes (ACE), et ces entrées sont fractionnées ou combinées si nécessaire lorsque vous modifiez les règles de sécurité d’accès pour un utilisateur. Par conséquent, une règle peut ne plus exister dans la forme spécifique qu’elle avait lors de son ajout, et dans ce cas, la méthode ne peut pas la RemoveAccessRuleSpecific supprimer.
