Message.Formatter Proprietà
Definizione
Importante
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Ottiene o imposta il formattatore utilizzato per serializzare o deserializzare un oggetto da e nel corpo del messaggio.
public:
property System::Messaging::IMessageFormatter ^ Formatter { System::Messaging::IMessageFormatter ^ get(); void set(System::Messaging::IMessageFormatter ^ value); };[System.ComponentModel.Browsable(false)]
public System.Messaging.IMessageFormatter Formatter { get; set; }[<System.ComponentModel.Browsable(false)>]
member this.Formatter : System.Messaging.IMessageFormatter with get, setPublic Property Formatter As IMessageFormatterValore della proprietà
IMessageFormatter che produce un flusso da scrivere o leggere dal corpo del messaggio. Il valore predefinito è XmlMessageFormatter.
- Attributi
Eccezioni
La proprietà Formatter è null.
Esempio
Nell'esempio di codice seguente viene illustrata la formattazione di un corpo del messaggio usando BinaryMessageFormatter.
#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;
/// <summary>
/// Provides a container class for the example.
/// </summary>
ref class MyNewQueue
{
public:
//*************************************************
// Creates a new queue.
//*************************************************
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 );
}
}
//*************************************************
// Sends an image to a queue, using the BinaryMessageFormatter.
//*************************************************
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 = gcnew MessageQueue( ".\\myQueue" );
Message^ myMessage = gcnew Message( myImage,gcnew BinaryMessageFormatter );
// Send the image to the queue.
myQueue->Send( myMessage );
}
catch ( ArgumentException^ e )
{
Console::WriteLine( e->Message );
}
return;
}
//*************************************************
// Receives a message containing an image.
//*************************************************
void ReceiveMessage()
{
try
{
// Connect to the a queue on the local computer.
MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );
// Set the formatter to indicate body contains an Order.
myQueue->Formatter = gcnew BinaryMessageFormatter;
// Receive and format the message.
Message^ myMessage = myQueue->Receive();
Bitmap^ myImage = static_cast<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;
}
};
//*************************************************
// 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;
// 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
{
/// <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
Nell'esempio di codice seguente viene illustrata la formattazione di un corpo del messaggio usando XmlMessageFormatter.
#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
Commenti
Usare la proprietà durante la lettura e la Formatter scrittura di un messaggio. Quando viene inviato un messaggio alla coda, il formattatore serializza la Body proprietà in un flusso che può essere inviato alla coda dei messaggi. Quando si legge da una coda, il formattatore deserializza i dati del messaggio nella Body proprietà.
A meno che non si scrive il contenuto del messaggio direttamente nella BodyStream proprietà, impostare la Formatter proprietà prima di inviare il messaggio. Quando il Send metodo viene chiamato nell'istanza MessageQueue , il corpo viene serializzato usando il formattatore contenuto nella Formatter proprietà. Se si invia il messaggio senza specificare un valore per la Formatter proprietà, il formattatore viene predefinito su XmlMessageFormatter.
L'oggetto XmlMessageFormatter è associato in modo libero, quindi non è necessario avere lo stesso tipo di oggetto nel mittente e nel ricevitore quando si usa questo formato. Oggetto ActiveXMessageFormatter e BinaryMessageFormatter serializzare i dati nella rappresentazione binaria. Viene usato durante l'invio ActiveXMessageFormatter o la ricezione di componenti COM.