MutexSecurity.AddAccessRule(MutexAccessRule) Metodo

Definizione

Cerca una regola di controllo di accesso corrispondente a cui è possibile unire la nuova regola.Searches for a matching access control rule with which the new rule can be merged. Se non viene trovata alcuna regola, viene aggiunta la nuova regola.If none are found, adds the new rule.

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

Parametri

rule
MutexAccessRule

Regola di controllo di accesso da aggiungere.The access control rule to add.

Eccezioni

rule è null.rule is null.

Non è possibile eseguire il mapping di rule a un'identità nota.rule cannot be mapped to a known identity.

Esempio

Nell'esempio di codice riportato di seguito viene illustrata la separazione tra regole di Allow e regole di Deny e viene illustrata la combinazione di diritti in regole compatibili.The following code example demonstrates the separation between Allow rules and Deny rules, and shows the combination of rights in compatible rules. Nell'esempio viene creato un oggetto MutexSecurity, vengono aggiunte regole che consentono e negano diversi diritti per l'utente corrente e viene visualizzata la coppia di regole risultante.The example creates a MutexSecurity object, adds rules that allow and deny various rights for the current user, and displays the resulting pair of rules. Nell'esempio vengono quindi consentiti nuovi diritti per l'utente corrente e viene visualizzato il risultato, mostrando che i nuovi diritti vengono uniti con la regola di Allow esistente.The example then allows new rights for the current user and displays the result, showing that the new rights are merged with the existing Allow rule.

Nota

In questo esempio l'oggetto di sicurezza non viene collegato a un oggetto Mutex.This example does not attach the security object to a Mutex object. Esempi di associazione di oggetti di sicurezza sono disponibili in Mutex.GetAccessControlMutex.SetAccessControl.Examples that attach security objects can be found in Mutex.GetAccessControlMutex.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.
        MutexAccessRule rule = new MutexAccessRule(user, 
            MutexRights.Synchronize | MutexRights.Modify, 
            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);

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


Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions

        User: TestDomain\TestUser
        Type: Allow
      Rights: Modify, ReadPermissions, 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 MutexSecurity()

        ' Add a rule that grants the current user the 
        ' right to enter or release the mutex.
        Dim rule As New MutexAccessRule(user, _
            MutexRights.Synchronize _
            Or MutexRights.Modify, _
            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)

        ' Add a rule that allows the current user the 
        ' right to read permissions on the mutex. This rule
        ' is merged with the existing Allow rule.
        rule = New MutexAccessRule(user, _
            MutexRights.ReadPermissions, _
            AccessControlType.Allow)
        mSec.AddAccessRule(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, Synchronize
'
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Deny
'      Rights: ChangePermissions
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: Modify, ReadPermissions, Synchronize

Commenti

Il metodo AddAccessRule Cerca le regole con lo stesso utente o gruppo e lo stesso AccessControlType rule.The AddAccessRule method searches for rules with the same user or group and the same AccessControlType as rule. Se non viene trovato alcun valore, viene aggiunto rule.If none are found, rule is added. Se viene trovata una regola di corrispondenza, i diritti in rule vengono uniti con la regola esistente.If a matching rule is found, the rights in rule are merged with the existing rule.

Si applica a