MutexAccessRule Construtores

Origem:

MutexSecurity.cs

Origem:

MutexSecurity.cs

public:
 MutexAccessRule(System::Security::Principal::IdentityReference ^ identity, System::Security::AccessControl::MutexRights eventRights, System::Security::AccessControl::AccessControlType type);

public MutexAccessRule (System.Security.Principal.IdentityReference identity, System.Security.AccessControl.MutexRights eventRights, System.Security.AccessControl.AccessControlType type);

new System.Security.AccessControl.MutexAccessRule : System.Security.Principal.IdentityReference * System.Security.AccessControl.MutexRights * System.Security.AccessControl.AccessControlType -> System.Security.AccessControl.MutexAccessRule

Public Sub New (identity As IdentityReference, eventRights As MutexRights, type As AccessControlType)

Parâmetros

Exceções

Comentários

Para aguardar um Mutex (chamando o WaitOnemétodo ou WaitAnyWaitAll ), um usuário deve ter MutexRights.Synchronize acesso. Para liberar o mutex, chamando o ReleaseMutex método , o usuário deve ter MutexRights.Modify acesso.

Origem:

MutexSecurity.cs

Origem:

MutexSecurity.cs

public:
 MutexAccessRule(System::String ^ identity, System::Security::AccessControl::MutexRights eventRights, System::Security::AccessControl::AccessControlType type);

public MutexAccessRule (string identity, System.Security.AccessControl.MutexRights eventRights, System.Security.AccessControl.AccessControlType type);

new System.Security.AccessControl.MutexAccessRule : string * System.Security.AccessControl.MutexRights * System.Security.AccessControl.AccessControlType -> System.Security.AccessControl.MutexAccessRule

Public Sub New (identity As String, eventRights As MutexRights, type As AccessControlType)

Parâmetros

Exceções

Exemplos

O exemplo de código a seguir demonstra o uso desse construtor para criar 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 Allow .

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

Para aguardar um Mutex (chamando o WaitOnemétodo ou WaitAnyWaitAll ), um usuário deve ter MutexRights.Synchronize acesso. Para liberar o mutex, chamando os ReleaseMutex métodos , o usuário deve ter MutexRights.Modify acesso.

Esse construtor é equivalente à criação de um NTAccount objeto, passando identity para o NTAccount.NTAccount(String) construtor e passando o objeto recém-criado NTAccount para o MutexAccessRule(IdentityReference, MutexRights, AccessControlType) construtor.