Message Construtores

Referência

Definição

Namespace:: System.Messaging

Assembly:: System.Messaging.dll

Importante

Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.

Inicializa uma nova instância da classe Message.

Sobrecargas

Message()	Inicializa uma nova instância da classe Message com um corpo vazio.
Message(Object)	Inicializa uma nova instância da classe Message usando o XmlMessageFormatter para serializar o objeto especificado no corpo da mensagem.
Message(Object, IMessageFormatter)	Inicializa uma nova instância da classe Message usando o formatador especificado para serializar o objeto especificado no corpo da mensagem.

Message()

Inicializa uma nova instância da classe Message com um corpo vazio.

public:
 Message();

public Message ();

Public Sub New ()

Exemplos

O exemplo de código a seguir envia duas mensagens de prioridades diferentes para a fila e as recupera posteriormente.


#using <system.dll>
#using <system.messaging.dll>

using namespace System;
using namespace System::Messaging;

/// <summary>
/// Provides a container class for the example.
/// </summary>
ref class MyNewQueue
{
   //**************************************************
   // Sends a string message to a queue.
   //**************************************************
public:
   void SendMessage( MessagePriority priority, String^ messageBody )
   {
      // Connect to a queue on the local computer.
      MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );

      // Create a new message.
      Message^ myMessage = gcnew Message;
      if ( priority > MessagePriority::Normal )
      {
         myMessage->Body = "High Priority: {0}",messageBody;
      }
      else
      {
         myMessage->Body = messageBody;
      }

      // Set the priority of the message.
      myMessage->Priority = priority;

      // Send the Order to the queue.
      myQueue->Send( myMessage );

      return;
   }

   //**************************************************
   // Receives a message.
   //**************************************************
   void ReceiveMessage()
   {
      // Connect to the a queue on the local computer.
      MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );

      // Set the queue to read the priority. By default, it
      // is not read.
      myQueue->MessageReadPropertyFilter->Priority = true;

      // Set the formatter to indicate body contains a String^.
      array<Type^>^ p = gcnew array<Type^>(1);
      p[ 0 ] = String::typeid;
      myQueue->Formatter = gcnew XmlMessageFormatter( p );
      try
      {
         // Receive and format the message. 
         Message^ myMessage = myQueue->Receive();

         // Display message information.
         Console::WriteLine( "Priority: {0}",
            myMessage->Priority );
         Console::WriteLine( "Body: {0}",
            myMessage->Body );
      }
      catch ( MessageQueueException^ ) 
      {
         // Handle Message Queuing exceptions.
      }
      // Handle invalid serialization format.
      catch ( InvalidOperationException^ e ) 
      {
         Console::WriteLine( e->Message );
      }

      // Catch other exceptions as necessary.

      return;
   }
};

//**************************************************
// Provides an entry point into the application.
//		 
// This example sends and receives a message from
// a queue.
//**************************************************
int main()
{
   // Create a new instance of the class.
   MyNewQueue^ myNewQueue = gcnew MyNewQueue;

   // Send messages to a queue.
   myNewQueue->SendMessage( MessagePriority::Normal, "First Message Body." );
   myNewQueue->SendMessage( MessagePriority::Highest, "Second Message Body." );

   // Receive messages from a queue.
   myNewQueue->ReceiveMessage();
   myNewQueue->ReceiveMessage();

   return 0;
}

using System;
using System.Messaging;

namespace MyProject
{

    /// <summary>
    /// Provides a container class for the example.
    /// </summary>
    public class MyNewQueue
    {

        //**************************************************
        // Provides an entry point into the application.
        //		
        // This example sends and receives a message from
        // a queue.
        //**************************************************

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

            // Send messages to a queue.
            myNewQueue.SendMessage(MessagePriority.Normal, "First Message Body.");
            myNewQueue.SendMessage(MessagePriority.Highest, "Second Message Body.");

            // Receive messages from a queue.
            myNewQueue.ReceiveMessage();
            myNewQueue.ReceiveMessage();

            return;
        }

        //**************************************************
        // Sends a string message to a queue.
        //**************************************************
        
        public void SendMessage(MessagePriority priority, string messageBody)
        {

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

            // Create a new message.
            Message myMessage = new Message();

            if(priority > MessagePriority.Normal)
            {
                myMessage.Body = "High Priority: " + messageBody;
            }
            else
            {
                myMessage.Body = messageBody;
            }

            // Set the priority of the message.
            myMessage.Priority = priority;

            // Send the Order to the queue.
            myQueue.Send(myMessage);

            return;
        }

        //**************************************************
        // Receives a message.
        //**************************************************
        
        public  void ReceiveMessage()
        {
            // Connect to the a queue on the local computer.
            MessageQueue myQueue = new MessageQueue(".\\myQueue");

            // Set the queue to read the priority. By default, it
            // is not read.
            myQueue.MessageReadPropertyFilter.Priority = true;

            // Set the formatter to indicate body contains a string.
            myQueue.Formatter = new XmlMessageFormatter(new Type[]
                {typeof(string)});
            
            try
            {
                // Receive and format the message.
                Message myMessage =	myQueue.Receive();

                // Display message information.
                Console.WriteLine("Priority: " +
                    myMessage.Priority.ToString());
                Console.WriteLine("Body: " +
                    myMessage.Body.ToString());
            }
            
            catch (MessageQueueException)
            {
                // Handle Message Queuing exceptions.
            }

            // Handle invalid serialization format.
            catch (InvalidOperationException e)
            {
                Console.WriteLine(e.Message);
            }
            
            // Catch other exceptions as necessary.

            return;
        }
    }
}

Imports System.Messaging


'Provides a container class for the example.
Public Class MyNewQueue
      
      

      ' Provides an entry point into the application.
      '		 
      ' This example sends and receives a message from
      ' a queue.

      Public Shared Sub Main()
         ' Create a new instance of the class.
         Dim myNewQueue As New MyNewQueue()
         
         ' Send messages to a queue.
         myNewQueue.SendMessage(MessagePriority.Normal, "First Message Body.")
         myNewQueue.SendMessage(MessagePriority.Highest, "Second Message Body.")
         
         ' Receive messages from a queue.
         myNewQueue.ReceiveMessage()
         myNewQueue.ReceiveMessage()
         
         Return
      End Sub
      
      
      

      ' Sends a string message to a queue.

      Public Sub SendMessage(priority As MessagePriority, messageBody As String)
         
         ' Connect to a queue on the local computer.
         Dim myQueue As New MessageQueue(".\myQueue")
         
         ' Create a new message.
         Dim myMessage As New Message()
         
         If priority > MessagePriority.Normal Then
            myMessage.Body = "High Priority: " + messageBody
         Else
            myMessage.Body = messageBody
         End If 
         ' Set the priority of the message.
         myMessage.Priority = priority
         
         
         ' Send the Order to the queue.
         myQueue.Send(myMessage)
         
         Return
      End Sub
      
      
      

      ' Receives a message.

      Public Sub ReceiveMessage()
         ' Connect to the a queue on the local computer.
         Dim myQueue As New MessageQueue(".\myQueue")
         
         ' Set the queue to read the priority. By default, it
         ' is not read.
         myQueue.MessageReadPropertyFilter.Priority = True
         
         ' Set the formatter to indicate body contains a string.
         myQueue.Formatter = New XmlMessageFormatter(New Type() {GetType(String)})
         
         Try
            ' Receive and format the message. 
            Dim myMessage As Message = myQueue.Receive()
            
            ' Display message information.
            Console.WriteLine(("Priority: " + myMessage.Priority.ToString()))
            Console.WriteLine(("Body: " + myMessage.Body.ToString()))
         
         
         
         ' Handle invalid serialization format.
         Catch e As InvalidOperationException
            Console.WriteLine(e.Message)
         End Try
         
         ' Catch other exceptions as necessary.
         Return
      End Sub
   End Class

Comentários

Use essa sobrecarga para criar uma nova instância da Message classe que tem um corpo vazio.

Especifique a Body propriedade ou a BodyStream propriedade antes de enviar o Message objeto . A Body propriedade pode ser qualquer objeto que possa ser serializado, como uma cadeia de caracteres de texto, um objeto de estrutura, uma instância de classe ou um objeto inserido.

A menos que você escreva o conteúdo da mensagem diretamente na BodyStream propriedade , defina a Formatter propriedade antes de enviar a mensagem. O corpo é serializado usando o Formatter valor da propriedade no momento em que o Send método é chamado na MessageQueue instância .

O XmlMessageFormatter é acoplado vagamente, portanto, não é necessário ter o mesmo tipo de objeto no remetente e no receptor ao usar esse formato. O ActiveXMessageFormatter e BinaryMessageFormatter serializam os dados em representação binária. O ActiveXMessageFormatter é usado ao enviar ou receber componentes COM.

A tabela a seguir mostra os valores de propriedade iniciais de uma instância do Message.

Propriedade	Valor inicial
AcknowledgeType	`AcknowledgeType.None`
AdministrationQueue	`null`
AppSpecific	0
AttachSenderId	`true`
AuthenticationProviderName	Microsoft Base Cryptographic Provider versão 1.0
AuthenticationProviderType	`CryptoProviderType.RSA_FULL`
Body	`null`
BodyStream	`Stream.null`
BodyType	0
ConnectorType	`Guid.Empty`
CorrelationId	Uma cadeia de caracteres vazia ("")
DestinationSymmetricKey	Uma matriz de bytes de comprimento zero
DigitalSignature	Uma matriz de bytes de comprimento zero
EncryptionAlgorithm	`EncryptionAlgorithm.RC2`
Extension	Uma matriz de bytes de comprimento zero
Formatter	`XmlMessageFormatter`
HashAlgorithm	`HashAlgorithm.MD5`
Label	Uma cadeia de caracteres vazia ("")
Priority	`MessagePriority.Normal`
Recoverable	`false`
ResponseQueue	`null`
SenderCertificate	Uma matriz de bytes de comprimento zero
TimeToBeReceived	`Message.InfiniteTimeout`
TimeToReachQueue	`Message.InfiniteTimeout`
TransactionStatusQueue	`null`
UseAuthentication	`false`
UseDeadLetterQueue	`false`
UseEncryption	`false`
UseJournalQueue	`false`
UseTracing	`false`

Confira também

Aplica-se a

Message(Object)

Inicializa uma nova instância da classe Message usando o XmlMessageFormatter para serializar o objeto especificado no corpo da mensagem.

public:
 Message(System::Object ^ body);

public Message (object body);

new System.Messaging.Message : obj -> System.Messaging.Message

Public Sub New (body As Object)

Parâmetros

body: Object

O objeto a ser serializado no corpo da mensagem.

Exemplos

O exemplo de código a seguir cria uma nova fila, envia uma mensagem que contém uma ordem para ela e a recupera.

#using <system.dll>
#using <system.messaging.dll>
#using <system.drawing.dll>

using namespace System;
using namespace System::Messaging;
using namespace System::Drawing;
using namespace System::IO;
ref class Order
{
public:
   int orderId;
   DateTime orderTime;
};

ref class MyNewQueue
{
public:
   static void CreateQueue( String^ queuePath )
   {
      try
      {
         if (  !MessageQueue::Exists( queuePath ) )
         {
            MessageQueue::Create( queuePath );
         }
         else
         {
            Console::WriteLine(  "{0} already exists.", queuePath );
         }
      }
      catch ( MessageQueueException^ e ) 
      {
         Console::WriteLine( e->Message );
      }

   }

   void SendMessage()
   {
      try
      {
         // Create a new order and set values.
         Order^ sentOrder = gcnew Order;
         sentOrder->orderId = 3;
         sentOrder->orderTime = DateTime::Now;

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

         // Create the new order.
         Message^ myMessage = gcnew Message( sentOrder );

         // Send the order to the queue.
         myQueue->Send( myMessage );
      }
      catch ( ArgumentException^ e ) 
      {
         Console::WriteLine( e->Message );
      }

      return;
   }

   void ReceiveMessage()
   {
      // Connect to the a queue on the local computer.
      MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );

      // Set the formatter to indicate body contains an Order.
      array<Type^>^p = gcnew array<Type^>(1);
      p[ 0 ] = Order::typeid;
      myQueue->Formatter = gcnew XmlMessageFormatter( p );
      try
      {
         // Receive and format the message. 
         Message^ myMessage = myQueue->Receive();
         Order^ myOrder = dynamic_cast<Order^>(myMessage->Body);

         // Display message information.
         Console::WriteLine( "Order ID: {0}", myOrder->orderId );
         Console::WriteLine( "Sent: {0}", myOrder->orderTime );
      }
      catch ( MessageQueueException^ ) 
      {
         // Handle Message Queuing exceptions.
      }
      // Handle invalid serialization format.
      catch ( InvalidOperationException^ e ) 
      {
         Console::WriteLine( e->Message );
      }

      // Catch other exceptions as necessary.
      return;
   }
};

int main()
{
   // Create a new instance of the class.
   MyNewQueue^ myNewQueue = gcnew MyNewQueue;

   // Create a queue on the local computer.
   MyNewQueue::CreateQueue( ".\\myQueue" );

   // Send a message to a queue.
   myNewQueue->SendMessage();

   // Receive a message from a queue.
   myNewQueue->ReceiveMessage();
   return 0;
}

using System;
using System.Messaging;
using System.Drawing;
using System.IO;

namespace MyProject
{

    // The following example
    // sends to a queue and receives from a queue.
    public class Order
    {
        public int orderId;
        public DateTime orderTime;
    };	

    /// <summary>
    /// Provides a container class for the example.
    /// </summary>
    public class MyNewQueue
    {

        //**************************************************
        // Provides an entry point into the application.
        //		
        // This example sends and receives a message from
        // a queue.
        //**************************************************

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

            // Create a queue on the local computer.
            CreateQueue(".\\myQueue");
            
            // Send a message to a queue.
            myNewQueue.SendMessage();

            // Receive a message from a queue.
            myNewQueue.ReceiveMessage();

            return;
        }

        //**************************************************
        // Creates a new queue.
        //**************************************************

        public static void CreateQueue(string queuePath)
        {
            try	
            {
                if(!MessageQueue.Exists(queuePath))
                {
                    MessageQueue.Create(queuePath);
                }
                else
                {
                    Console.WriteLine(queuePath + " already exists.");
                }
            }
            catch (MessageQueueException e)
            {
                Console.WriteLine(e.Message);
            }
        }

        //**************************************************
        // Sends an Order to a queue.
        //**************************************************
        
        public void SendMessage()
        {
            try
            {

                // Create a new order and set values.
                Order sentOrder = new Order();
                sentOrder.orderId = 3;
                sentOrder.orderTime = DateTime.Now;

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

                // Create the new order.
                Message myMessage = new Message(sentOrder);

                // Send the order to the queue.
                myQueue.Send(myMessage);
            }
            catch(ArgumentException e)
            {
                Console.WriteLine(e.Message);
            }

            return;
        }

        //**************************************************
        // Receives a message containing an order.
        //**************************************************
        
        public  void ReceiveMessage()
        {
            // Connect to the a queue on the local computer.
            MessageQueue myQueue = new MessageQueue(".\\myQueue");

            // Set the formatter to indicate body contains an Order.
            myQueue.Formatter = new XmlMessageFormatter(new Type[]
                {typeof(MyProject.Order)});
            
            try
            {
                // Receive and format the message.
                Message myMessage =	myQueue.Receive();
                Order myOrder = (Order)myMessage.Body;

                // Display message information.
                Console.WriteLine("Order ID: " +
                    myOrder.orderId.ToString());
                Console.WriteLine("Sent: " +
                    myOrder.orderTime.ToString());
            }
            
            catch (MessageQueueException)
            {
                // Handle Message Queuing exceptions.
            }

                // Handle invalid serialization format.
            catch (InvalidOperationException e)
            {
                Console.WriteLine(e.Message);
            }
            
            // Catch other exceptions as necessary.

            return;
        }
    }
}

Imports System.Messaging
Imports System.Drawing
Imports System.IO



   
' The following example 
' sends to a queue and receives from a queue.
Public Class Order
      Public orderId As Integer
      Public orderTime As DateTime
End Class

   
  
' Provides a container class for the example.

Public Class MyNewQueue
      
      

   ' Provides an entry point into the application.
   '		 
   ' This example sends and receives a message from
   ' a queue.

   Public Shared Sub Main()
      ' Create a new instance of the class.
      Dim myNewQueue As New MyNewQueue()
        
      ' Create a queue on the local computer.
      CreateQueue(".\myQueue")
         
      ' Send a message to a queue.
      myNewQueue.SendMessage()
       
      ' Receive a message from a queue.
      myNewQueue.ReceiveMessage()
         
      Return
   End Sub
      
      

      ' Creates a new queue.
   Public Shared Sub CreateQueue(queuePath As String)
      Try
         If Not MessageQueue.Exists(queuePath) Then
            MessageQueue.Create(queuePath)
         Else
            Console.WriteLine((queuePath + " already exists."))
         End If
      Catch e As MessageQueueException
         Console.WriteLine(e.Message)
      End Try
   End Sub
       
      

      ' Sends an Order to a queue.

   Public Sub SendMessage()
      Try
            
            ' Create a new order and set values.
            Dim sentOrder As New Order()
            sentOrder.orderId = 3
            sentOrder.orderTime = DateTime.Now
            
            ' Connect to a queue on the local computer.
            Dim myQueue As New MessageQueue(".\myQueue")
            
            
            
            ' Create the new order.
            Dim myMessage As New Message(sentOrder)
            
            ' Send the order to the queue.
            myQueue.Send(myMessage)
      Catch e As ArgumentException
            Console.WriteLine(e.Message)
      End Try 
         
      Return
   End Sub
      
      
      
 
      ' Receives a message containing an order.
 
   Public Sub ReceiveMessage()
         ' Connect to the a queue on the local computer.
         Dim myQueue As New MessageQueue(".\myQueue")
         
         ' Set the formatter to indicate body contains an Order.
         myQueue.Formatter = New XmlMessageFormatter(New Type() {GetType(Order)})
         
         Try
            ' Receive and format the message. 
            Dim myMessage As Message = myQueue.Receive()
            Dim myOrder As Order = CType(myMessage.Body, Order)
            
            ' Display message information.
            Console.WriteLine(("Order ID: " + myOrder.orderId.ToString()))
            Console.WriteLine(("Sent: " + myOrder.orderTime.ToString()))
         
  
         ' Handle invalid serialization format.
         Catch e As InvalidOperationException
            Console.WriteLine(e.Message)
         End Try
         
         ' Catch other exceptions as necessary.
         Return
   End Sub
End Class

Comentários

Use essa sobrecarga para criar uma nova instância da Message classe que contém o Body especificado pelo body parâmetro . O body parâmetro pode ser qualquer objeto que possa ser serializado, como uma cadeia de caracteres de texto, um objeto de estrutura, uma instância de classe ou um objeto inserido. O corpo é serializado usando o , XmlMessageFormatter a menos que você altere a Formatter propriedade antes de ser Message enviada. Se você alterar a propriedade ou Formatter a Body qualquer momento antes de chamar Send, a mensagem será serializada de acordo com o novo valor da propriedade.

A tabela a seguir mostra os valores de propriedade iniciais de uma instância do Message.

Propriedade	Valor inicial
AcknowledgeType	`AcknowledgeType.None`
AdministrationQueue	`null`
AppSpecific	0
AttachSenderId	`true`
AuthenticationProviderName	Microsoft Base Cryptographic Provider versão 1.0
AuthenticationProviderType	`CryptoProviderType.RSA_FULL`
Body	O parâmetro `body`.
BodyStream	`Stream.null`
BodyType	0
ConnectorType	`Guid.Empty`
CorrelationId	Uma cadeia de caracteres vazia ("")
DestinationSymmetricKey	Uma matriz de bytes de comprimento zero
DigitalSignature	Uma matriz de bytes de comprimento zero
EncryptionAlgorithm	`EncryptionAlgorithm.RC2`
Extension	Uma matriz de bytes de comprimento zero
Formatter	`XmlMessageFormatter`
HashAlgorithm	`HashAlgorithm.MD5`
Label	Uma cadeia de caracteres vazia ("")
Priority	`MessagePriority.Normal`
Recoverable	`false`
ResponseQueue	`null`
SenderCertificate	Uma matriz de bytes de comprimento zero
TimeToBeReceived	`Message.InfiniteTimeout`
TimeToReachQueue	`Message.InfiniteTimeout`
TransactionStatusQueue	`null`
UseAuthentication	`false`
UseDeadLetterQueue	`false`
UseEncryption	`false`
UseJournalQueue	`false`
UseTracing	`false`

Confira também

Aplica-se a

Message(Object, IMessageFormatter)

Inicializa uma nova instância da classe Message usando o formatador especificado para serializar o objeto especificado no corpo da mensagem.

public:
 Message(System::Object ^ body, System::Messaging::IMessageFormatter ^ formatter);

public Message (object body, System.Messaging.IMessageFormatter formatter);

new System.Messaging.Message : obj * System.Messaging.IMessageFormatter -> System.Messaging.Message

Public Sub New (body As Object, formatter As IMessageFormatter)

Parâmetros

body: Object

O objeto a ser serializado no corpo da mensagem.

formatter: IMessageFormatter

Um IMessageFormatter que especifica o formatador com o qual o corpo da mensagem é serializado.

Exemplos

using System;
using System.Messaging;
using System.Drawing;
using System.IO;

namespace MyProject
{

    /// <summary>
    /// Provides a container class for the example.
    /// </summary>
    public class MyNewQueue
    {

        //**************************************************
        // Provides an entry point into the application.
        //		
        // This example sends and receives a message from
        // a queue.
        //**************************************************

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

            // Create a queue on the local computer.
            CreateQueue(".\\myQueue");
            
            // Send a message to a queue.
            myNewQueue.SendMessage();

            // Receive a message from a queue.
            myNewQueue.ReceiveMessage();

            return;
        }

        //**************************************************
        // Creates a new queue.
        //**************************************************

        public static void CreateQueue(string queuePath)
        {
            try	
            {
                if(!MessageQueue.Exists(queuePath))
                {
                    MessageQueue.Create(queuePath);
                }
                else
                {
                    Console.WriteLine(queuePath + " already exists.");
                }
            }
            catch (MessageQueueException e)
            {
                Console.WriteLine(e.Message);
            }
        }

        //**************************************************
        // Sends an image to a queue, using the BinaryMessageFormatter.
        //**************************************************
        
        public void SendMessage()
        {
            try{

                // Create a new bitmap.
                // The file must be in the \bin\debug or \bin\retail folder, or
                // you must give a full path to its location.
                Image myImage = Bitmap.FromFile("SentImage.bmp");

                // Connect to a queue on the local computer.
                MessageQueue myQueue = new MessageQueue(".\\myQueue");
                
                Message myMessage = new Message(myImage, new BinaryMessageFormatter());

                // Send the image to the queue.
                myQueue.Send(myMessage);
            }
            catch(ArgumentException e)
            {
                Console.WriteLine(e.Message);
            }

            return;
        }

        //**************************************************
        // Receives a message containing an image.
        //**************************************************
        
        public  void ReceiveMessage()
        {
                        
            try
            {

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

                // Set the formatter to indicate body contains an Order.
                myQueue.Formatter = new BinaryMessageFormatter();

                // Receive and format the message.
                System.Messaging.Message myMessage = myQueue.Receive();
                Bitmap myImage = (Bitmap)myMessage.Body;
                
                // This will be saved in the \bin\debug or \bin\retail folder.
                myImage.Save("ReceivedImage.bmp",System.Drawing.Imaging.ImageFormat.Bmp);
            }
            
            catch (MessageQueueException)
            {
                // Handle Message Queuing exceptions.
            }

            // Handle invalid serialization format.
            catch (InvalidOperationException e)
            {
                Console.WriteLine(e.Message);
            }

            catch (IOException e)
            {
                // Handle file access exceptions.
            }
            
            // Catch other exceptions as necessary.

            return;
        }
    }
}

Imports System.Messaging
Imports System.Drawing
Imports System.IO


Namespace MyProj
    _
   
   
   Public Class MyNewQueue
      
      
      '**************************************************
      ' Provides an entry point into the application.
      '		 
      ' This example sends and receives a message from
      ' a queue.
      '**************************************************
      Public Shared Sub Main()
         ' Create a new instance of the class.
         Dim myNewQueue As New MyNewQueue()
         
         ' Create a queue on the local computer.
         CreateQueue(".\myQueue")
         
         ' Send a message to a queue.
         myNewQueue.SendMessage()
         
         ' Receive a message from a queue.
         myNewQueue.ReceiveMessage()
         
         Return
      End Sub
      
      
      '**************************************************
      ' Creates a new queue.
      '**************************************************
      Public Shared Sub CreateQueue(queuePath As String)
         Try
            If Not MessageQueue.Exists(queuePath) Then
               MessageQueue.Create(queuePath)
            Else
               Console.WriteLine((queuePath + " already exists."))
            End If
         Catch e As MessageQueueException
            Console.WriteLine(e.Message)
         End Try
      End Sub
       
      
      '**************************************************
      ' Sends an image to a queue, using the BinaryMessageFormatter.
      '**************************************************
      Public Sub SendMessage()
         Try
            
            ' Create a new bitmap.
            ' The file must be in the \bin\debug or \bin\retail folder, or
            ' you must give a full path to its location.
            Dim myImage As Image = Bitmap.FromFile("SentImage.bmp")
            
            ' Connect to a queue on the local computer.
            Dim myQueue As New MessageQueue(".\myQueue")
            
            Dim myMessage As New Message(myImage, New BinaryMessageFormatter())
            
            ' Send the image to the queue.
            myQueue.Send(myMessage)
         Catch e As ArgumentException
            Console.WriteLine(e.Message)
         End Try 
         
         Return
      End Sub
      
      
      
      '**************************************************
      ' Receives a message containing an image.
      '**************************************************
      Public Sub ReceiveMessage()
         
         Try
            
            ' Connect to the a queue on the local computer.
            Dim myQueue As New MessageQueue(".\myQueue")
            
            ' Set the formatter to indicate body contains an Order.
            myQueue.Formatter = New BinaryMessageFormatter()
            
            ' Receive and format the message. 
            Dim myMessage As System.Messaging.Message = myQueue.Receive()
            Dim myImage As Bitmap = CType(myMessage.Body, Bitmap)
            
            ' This will be saved in the \bin\debug or \bin\retail folder.
            myImage.Save("ReceivedImage.bmp", System.Drawing.Imaging.ImageFormat.Bmp)
         
         
         
         'Catch
         ' Handle Message Queuing exceptions.
         
         ' Handle invalid serialization format.
         Catch e As InvalidOperationException
            Console.WriteLine(e.Message)
         
         Catch e As IOException
         End Try
         ' Handle file access exceptions.
         
         ' Catch other exceptions as necessary.
         Return
      End Sub
   End Class
End Namespace 'MyProj

Comentários

Use essa sobrecarga para criar uma nova instância da Message classe que contém o Body especificado pelo body parâmetro e que usa qualquer formatador válido para serializar o corpo. O body parâmetro é qualquer objeto que pode ser serializado, como uma cadeia de caracteres de texto, um objeto de estrutura, uma instância de classe ou um objeto inserido. Se você alterar a propriedade ou Formatter a Body qualquer momento antes de chamar Send, a mensagem será serializada de acordo com o novo valor da propriedade.

A tabela a seguir mostra os valores de propriedade iniciais de uma instância do Message.

Propriedade	Valor inicial
AcknowledgeType	`AcknowledgeType.None`
AdministrationQueue	`null`
AppSpecific	0
AttachSenderId	`true`
AuthenticationProviderName	Microsoft Base Cryptographic Provider versão 1.0
AuthenticationProviderType	`CryptoProviderType.RSA_FULL`
Body	O parâmetro `body`.
BodyStream	`Stream.null`
BodyType	0
ConnectorType	`Guid.Empty`
CorrelationId	Uma cadeia de caracteres vazia ("")
DestinationSymmetricKey	Uma matriz de bytes de comprimento zero
DigitalSignature	Uma matriz de bytes de comprimento zero
EncryptionAlgorithm	`EncryptionAlgorithm.RC2`
Extension	Uma matriz de bytes de comprimento zero
Formatter	O parâmetro `formatter`.
HashAlgorithm	`HashAlgorithm.MD5`
Label	Uma cadeia de caracteres vazia ("")
Priority	`MessagePriority.Normal`
Recoverable	`false`
ResponseQueue	`null`
SenderCertificate	Uma matriz de bytes de comprimento zero
TimeToBeReceived	`Message.InfiniteTimeout`
TimeToReachQueue	`Message.InfiniteTimeout`
TransactionStatusQueue	`null`
UseAuthentication	`false`
UseDeadLetterQueue	`false`
UseEncryption	`false`
UseJournalQueue	`false`
UseTracing	`false`

Confira também

Aplica-se a

Message Construtores

Definição

Sobrecargas

Message()

Exemplos

Comentários

Confira também

Aplica-se a

Message(Object)

Parâmetros

Exemplos

Comentários

Confira também

Aplica-se a

Message(Object, IMessageFormatter)

Parâmetros

Exemplos

Comentários

Confira também

Aplica-se a

Comentários

Recursos adicionais