MutexRights Enumeração

Definição

Namespace:

System.Security.AccessControl

Assembly:

System.Threading.AccessControl.dll

Pacote:

System.Threading.AccessControl v8.0.0

Origem:

MutexSecurity.cs

Especifica os direitos de controle de acesso que podem ser aplicados a objetos mutex do sistema nomeado.

Essa enumeração dá suporte a uma combinação bit a bit dos valores de membro.

public enum class MutexRights

[System.Flags]
public enum MutexRights

[<System.Flags>]
type MutexRights = 

Public Enum MutexRights

Herança

Object

ValueType

Enum

MutexRights

Atributos

FlagsAttribute

Campos

ChangePermissions	262144	O direito de alterar as regras de segurança e auditoria associadas a um mutex nomeado.
Delete	65536	O direito de excluir um mutex nomeado.
FullControl	2031617	O direito de exercer controle total sobre um mutex nomeado e modificar suas regras de acesso e de auditoria.
Modify	1	O direito de liberar um mutex nomeado.
ReadPermissions	131072	O direito de abrir e copiar as regras de acesso e de auditoria para um mutex nomeado.
Synchronize	1048576	O direito de esperar um mutex nomeado.
TakeOwnership	524288	O direito de alterar o proprietário de um mutex nomeado.

Exemplos

O exemplo de código a seguir demonstra o uso de MutexRights valores ao criar e usar MutexAccessRule objetos . O exemplo cria um MutexSecurity objeto , adiciona regras que permitem e negam vários direitos para o usuário atual e exibe o par de regras resultante. Em seguida, o exemplo permite novos direitos para o usuário atual e exibe o resultado, mostrando que os novos direitos são mesclados com a regra existente AccessControlType.Allow .

Observação

Este exemplo não anexa o objeto de segurança a um Mutex objeto ; consulte MutexSecurity, Mutex.GetAccessControl método e 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.
        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

Comentários

Use a MutexRights enumeração para especificar direitos de controle de acesso ao criar MutexSecurity objetos. Para aplicar direitos de acesso a um mutex de sistema nomeado, use MutexSecurity objetos com o Mutex(Boolean, String, Boolean, MutexSecurity) construtor e o Mutex.SetAccessControl método .

Confira também

• MutexAccessRule
• MutexSecurity