MessageQueuePermissionAttribute Classe

Definição

Espaço de Nomes:
System.Messaging
Assemblagem:
System.Messaging.dll

Permite verificações declarativas MessageQueue de permissões.

public ref class MessageQueuePermissionAttribute : System::Security::Permissions::CodeAccessSecurityAttribute
[System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Event | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
[System.Serializable]
public class MessageQueuePermissionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute
[<System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Event | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)>]
[<System.Serializable>]
type MessageQueuePermissionAttribute = class
    inherit CodeAccessSecurityAttribute
Public Class MessageQueuePermissionAttribute
Inherits CodeAccessSecurityAttribute
Herança
Object
Attribute
SecurityAttribute
CodeAccessSecurityAttribute
MessageQueuePermissionAttribute
Atributos
AttributeUsageAttribute SerializableAttribute

Exemplos

O exemplo de código a seguir demonstra o uso de MessageQueuePermissionAttribute.


#using <System.Messaging.dll>
#using <System.dll>

using namespace System;
using namespace System::Messaging;

// Creates a new queue.
void CreateQueue(String^ queuePath, bool transactional)
{
    if (!MessageQueue::Exists(queuePath))
    {
        MessageQueue^ queue = MessageQueue::Create(queuePath, transactional);
        queue->Close();       
    }
    else
    {
        Console::WriteLine("{0} already exists.", queuePath);
    }
}

// Demonstrates the following MessageQueuePermissionAttribute constructor:
// public #ctor (SecurityAction action)
void CreateAttribute()
{

    // Create a new instance of MessageQueuePermissionAttribute.
    MessageQueuePermissionAttribute^ attribute =
        gcnew MessageQueuePermissionAttribute(
        System::Security::Permissions::SecurityAction::Assert);

}


void CategoryExample()
{

    // Connect to a queue on the local computer.
    MessageQueue^ queue = gcnew MessageQueue(".\\exampleQueue");

    // Create a new instance of MessageQueuePermissionAttribute.
    MessageQueuePermissionAttribute^ attribute =
        gcnew MessageQueuePermissionAttribute(
        System::Security::Permissions::SecurityAction::Assert);

    // Set the attribute's Category property value, based on the queue's
    // Category property value.
    attribute->Category = queue->Category.ToString();

    // Display the new value of the attribute's Category property.
    Console::WriteLine("attribute->Category: {0}",
        attribute->Category);

    queue->Close();
}

void LabelExample()
{

    // Connect to a queue on the local computer.
    MessageQueue^ queue = gcnew MessageQueue(".\\exampleQueue");

    // Create a new instance of MessageQueuePermissionAttribute.
    MessageQueuePermissionAttribute^ attribute =
        gcnew MessageQueuePermissionAttribute(
        System::Security::Permissions::SecurityAction::Assert);

    // Set the attribute's Label property value, based on the queue's Label
    // property value.
    attribute->Label = queue->Label;

    // Display the new value of the attribute's Label property.
    Console::WriteLine("attribute->Label: {0}", attribute->Label);

    queue->Close();
}


void MachineNameExample()
{

    // Connect to a queue on the local computer.
    MessageQueue^ queue = gcnew MessageQueue(".\\exampleQueue");

    // Create a new instance of MessageQueuePermissionAttribute.
    MessageQueuePermissionAttribute^ attribute =
        gcnew MessageQueuePermissionAttribute(
        System::Security::Permissions::SecurityAction::Assert);

    // Set the attribute's MachineName property value, based on the queue's
    // MachineName property value.
    attribute->MachineName = queue->MachineName;

    // Display the new value of the attribute's MachineName property.
    Console::WriteLine("attribute->MachineName: {0}",
        attribute->MachineName);

    queue->Close();
}

void PathExample()
{

    // Connect to a queue on the local computer.
    MessageQueue^ queue = gcnew MessageQueue(".\\exampleQueue");

    // Create a new instance of MessageQueuePermissionAttribute.
    MessageQueuePermissionAttribute^ attribute =
        gcnew MessageQueuePermissionAttribute(
        System::Security::Permissions::SecurityAction::Assert);

    // Set the attribute's Path property value, based on the queue's Path
    // property value.
    attribute->Path = queue->Path;

    // Display the new value of the attribute's Path property.
    Console::WriteLine("attribute->Path: {0}", attribute->Path);

    queue->Close();
}

void PermissionAccessExample()
{

    // Connect to a queue on the local computer.
    MessageQueue^ queue = gcnew MessageQueue(".\\exampleQueue");

    // Create a new instance of MessageQueuePermissionAttribute.
    MessageQueuePermissionAttribute^ attribute =
        gcnew MessageQueuePermissionAttribute(
        System::Security::Permissions::SecurityAction::Assert);

    // Set the attribute's PermissionAccess property value.
    attribute->PermissionAccess = MessageQueuePermissionAccess::Receive;

    // Display the new value of the attribute's PermissionAccess property.
    Console::WriteLine("attribute->PermissionAccess: {0}",
        attribute->PermissionAccess);

    queue->Close();
}

void CreatePermissionExample()
{

    // Connect to a queue on the local computer.
    MessageQueue^ queue = gcnew MessageQueue(".\\exampleQueue");

    // Create a new instance of MessageQueuePermissionAttribute.
    MessageQueuePermissionAttribute^ attribute =
        gcnew MessageQueuePermissionAttribute(
        System::Security::Permissions::SecurityAction::Assert);

    // Set the attribute's Path property value, based on the queue's Path
    // property value.
    attribute->Path = queue->Path;

    // Get an IPermission interface by calling the attribute's
    // CreatePermission() method.
    System::Security::IPermission^ permission = attribute->CreatePermission();

    queue->Close();
}

int main()
{
    try
    {

        // Create a non-transactional queue on the local computer.
        CreateQueue(".\\exampleQueue", false);

        // Demonstrate the members of MessageQueuePermissionAttribute.
        // Note that the Path, FormatName, MachineName, Label, and Category
        // property values cannot all be set on the same instance of
        // MessageQueuePermissionAttribute. Trying to do so will throw an
        // exception of type System.InvalidOperationException.

        CreateAttribute();
        CategoryExample();
        LabelExample();
        MachineNameExample();
        PathExample();
        PermissionAccessExample();
        CreatePermissionExample();
    }

    catch (InvalidOperationException^)
    {
        Console::WriteLine("Please install Message Queuing.");
    }

    catch (MessageQueueException^ ex)
    {
        Console::WriteLine(ex->Message);
    }
}


using System;
using System.Messaging;

public class MessageQueuePermissionAttributeExample
{
    public static void Main()
    {
        // Create a new instance of the class.
        MessageQueuePermissionAttributeExample example =
            new MessageQueuePermissionAttributeExample();

        // Create a non-transactional queue on the local computer.
        CreateQueue(".\\exampleQueue", false);

        // Demonstrate the members of MessageQueuePermissionAttribute.
        // Note that the Path, FormatName, MachineName, Label, and Category
        // property values cannot all be set on the same instance of
        // MessageQueuePermissionAttribute. Trying to do so will throw an
        // exception of type System.InvalidOperationException.
        example.CreateAttribute();
        example.CategoryExample();
        example.LabelExample();
        example.MachineNameExample();
        example.PathExample();
        example.PermissionAccessExample();
        example.CreatePermissionExample();
    }

    // Creates a new queue.
    public static void CreateQueue(string queuePath, bool transactional)
    {
        if(!MessageQueue.Exists(queuePath))
        {
            MessageQueue.Create(queuePath, transactional);
        }
        else
        {
            Console.WriteLine(queuePath + " already exists.");
        }
    }

    // Demonstrates the following MessageQueuePermissionAttribute constructor:
    // public #ctor (SecurityAction action)
    public void CreateAttribute()
    {

        // Create a new instance of MessageQueuePermissionAttribute.
        MessageQueuePermissionAttribute attribute =
            new MessageQueuePermissionAttribute(
            System.Security.Permissions.SecurityAction.Assert);

    }

    public void CategoryExample()
    {

        // Connect to a queue on the local computer.
        MessageQueue queue = new MessageQueue(".\\exampleQueue");

        // Create a new instance of MessageQueuePermissionAttribute.
        MessageQueuePermissionAttribute attribute =
            new MessageQueuePermissionAttribute(
            System.Security.Permissions.SecurityAction.Assert);

        // Set the attribute's Category property value, based on the queue's
        // Category property value.
        attribute.Category = queue.Category.ToString();

        // Display the new value of the attribute's Category property.
        Console.WriteLine("attribute.Category: {0}",
            attribute.Category.ToString());

    }

    public void LabelExample()
    {

        // Connect to a queue on the local computer.
        MessageQueue queue = new MessageQueue(".\\exampleQueue");

        // Create a new instance of MessageQueuePermissionAttribute.
        MessageQueuePermissionAttribute attribute =
            new MessageQueuePermissionAttribute(
            System.Security.Permissions.SecurityAction.Assert);

        // Set the attribute's Label property value, based on the queue's Label
        // property value.
        attribute.Label = queue.Label;

        // Display the new value of the attribute's Label property.
        Console.WriteLine("attribute.Label: {0}", attribute.Label);

    }

    public void MachineNameExample()
    {

        // Connect to a queue on the local computer.
        MessageQueue queue = new MessageQueue(".\\exampleQueue");

        // Create a new instance of MessageQueuePermissionAttribute.
        MessageQueuePermissionAttribute attribute =
            new MessageQueuePermissionAttribute(
            System.Security.Permissions.SecurityAction.Assert);

        // Set the attribute's MachineName property value, based on the queue's
        // MachineName property value.
        attribute.MachineName = queue.MachineName;

        // Display the new value of the attribute's MachineName property.
        Console.WriteLine("attribute.MachineName: {0}",
            attribute.MachineName);

    }

    public void PathExample()
    {

        // Connect to a queue on the local computer.
        MessageQueue queue = new MessageQueue(".\\exampleQueue");

        // Create a new instance of MessageQueuePermissionAttribute.
        MessageQueuePermissionAttribute attribute =
            new MessageQueuePermissionAttribute(
            System.Security.Permissions.SecurityAction.Assert);

        // Set the attribute's Path property value, based on the queue's Path
        // property value.
        attribute.Path = queue.Path;

        // Display the new value of the attribute's Path property.
        Console.WriteLine("attribute.Path: {0}", attribute.Path);

    }

    public void PermissionAccessExample()
    {

        // Connect to a queue on the local computer.
        MessageQueue queue = new MessageQueue(".\\exampleQueue");

        // Create a new instance of MessageQueuePermissionAttribute.
        MessageQueuePermissionAttribute attribute =
            new MessageQueuePermissionAttribute(
            System.Security.Permissions.SecurityAction.Assert);

        // Set the attribute's PermissionAccess property value.
        attribute.PermissionAccess = MessageQueuePermissionAccess.Receive;

        // Display the new value of the attribute's PermissionAccess property.
        Console.WriteLine("attribute.PermissionAccess: {0}",
            attribute.PermissionAccess);

    }

    public void CreatePermissionExample()
    {

        // Connect to a queue on the local computer.
        MessageQueue queue = new MessageQueue(".\\exampleQueue");

        // Create a new instance of MessageQueuePermissionAttribute.
        MessageQueuePermissionAttribute attribute =
            new MessageQueuePermissionAttribute(
            System.Security.Permissions.SecurityAction.Assert);

        // Set the attribute's Path property value, based on the queue's Path
        // property value.
        attribute.Path = queue.Path;

        // Get an IPermission interface by calling the attribute's
        // CreatePermission() method.
        System.Security.IPermission permission = attribute.CreatePermission();

    }
}

Observações

Para mais informações sobre o uso de atributos, consulte Atributos.

Construtores

Name Description
MessageQueuePermissionAttribute(SecurityAction)

Inicializa uma nova instância da MessageQueuePermissionAttribute classe.

Propriedades

Name Description
Action

Obtém ou define uma ação de segurança.

(Herdado de SecurityAttribute)
Category

Recebe ou define a categoria da fila.
Label

Recebe ou define a descrição da fila.
MachineName

Obtém ou define o nome do computador onde está localizada a fila de Fila de Mensagens.
Path

Obtém ou definem o percurso da fila.
PermissionAccess

Obtém ou define os níveis de acesso de permissões usados no pedido de permissões.
TypeId

Quando implementado numa classe derivada, obtém um identificador único para esta Attribute.

(Herdado de Attribute)
Unrestricted

Obtém ou define um valor que indica se está declarada permissão total (irrestrita) para o recurso protegido pelo atributo.

(Herdado de SecurityAttribute)

Métodos

Name Description
CreatePermission()

Cria a permissão com base nos níveis de acesso solicitados, categoria, rótulo, nome do computador e caminho que são definidos através de , PermissionAccessCategory, Label, MachineName, e Path propriedades no atributo.
Equals(Object)

Devolve um valor que indica se esta instância é igual a um objeto especificado.

(Herdado de Attribute)
GetHashCode()

Devolve o código de hash para esta instância.

(Herdado de Attribute)
GetType()

Obtém o Type da instância atual.

(Herdado de Object)
IsDefaultAttribute()

Quando sobrescrito numa classe derivada, indica se o valor desta instância é o valor padrão para a classe derivada.

(Herdado de Attribute)
Match(Object)

Quando sobrescrito numa classe derivada, devolve um valor que indica se esta instância é igual a um objeto especificado.

(Herdado de Attribute)
MemberwiseClone()

Cria uma cópia superficial do atual Object.

(Herdado de Object)
ToString()

Devolve uma cadeia que representa o objeto atual.

(Herdado de Object)

Implementações de Interface Explícita

Name Description
_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Mapeia um conjunto de nomes para um conjunto correspondente de identificadores de despacho.

(Herdado de Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Recupera a informação de tipo de um objeto, que pode ser usada para obter a informação de tipo para uma interface.

(Herdado de Attribute)
_Attribute.GetTypeInfoCount(UInt32)

Recupera o número de interfaces de informações de tipo que um objeto fornece (0 ou 1).

(Herdado de Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Proporciona acesso a propriedades e métodos expostos por um objeto.

(Herdado de Attribute)

Aplica-se a

Ver também