Message Konstruktorer
Definition
Viktigt
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Initierar en ny instans av Message klassen.
Överlagringar
| Name | Description |
|---|---|
| Message() |
Initierar en ny instans av Message klassen med en tom brödtext. |
| Message(Object) |
Initierar en ny instans av klassen med hjälp Message av XmlMessageFormatter för att serialisera det angivna objektet i meddelandets brödtext. |
| Message(Object, IMessageFormatter) |
Initierar en ny instans av Message klassen med den angivna formateringen för att serialisera det angivna objektet i meddelandets brödtext. |
Message()
Initierar en ny instans av Message klassen med en tom brödtext.
public:
Message();
public Message();
Public Sub New ()
Exempel
Följande kodexempel skickar två meddelanden med olika prioriteter till kön och hämtar dem därefter.
#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
Kommentarer
Använd den här överlagringen Message för att skapa en ny instans av klassen som har en tom brödtext.
Ange antingen egenskapen Body eller BodyStream egenskapen innan objektet skickas Message . Egenskapen Body kan vara alla objekt som kan serialiseras, till exempel en textsträng, ett strukturobjekt, en klassinstans eller ett inbäddat objekt.
Om du inte skriver innehållet i meddelandet direkt till BodyStream egenskapen anger Formatter du egenskapen innan du skickar meddelandet. Brödtexten Formatter serialiseras med egenskapens värde när Send metoden anropas på instansen MessageQueue .
Är XmlMessageFormatter löst kopplat, så det är inte nödvändigt att ha samma objekttyp på avsändaren och mottagaren när du använder det här formatet. Och ActiveXMessageFormatterBinaryMessageFormatter serialisera data till binär representation. ActiveXMessageFormatter Används vid sändning eller mottagning av COM-komponenter.
I följande tabell visas inledande egenskapsvärden för en instans av Message.
| Fastighet | Initialt värde |
|---|---|
| AcknowledgeType | AcknowledgeType.None |
| AdministrationQueue | null |
| AppSpecific | 0 |
| AttachSenderId | true |
| AuthenticationProviderName | Microsoft Base Cryptographic Provider version 1.0 |
| AuthenticationProviderType | CryptoProviderType.RSA_FULL |
| Body | null |
| BodyStream | Stream.null |
| BodyType | 0 |
| ConnectorType | Guid.Empty |
| CorrelationId | En tom sträng ("") |
| DestinationSymmetricKey | En matris med byte med noll längd |
| DigitalSignature | En matris med byte med noll längd |
| EncryptionAlgorithm | EncryptionAlgorithm.RC2 |
| Extension | En matris med byte med noll längd |
| Formatter | XmlMessageFormatter |
| HashAlgorithm | HashAlgorithm.MD5 |
| Label | En tom sträng ("") |
| Priority | MessagePriority.Normal |
| Recoverable | false |
| ResponseQueue | null |
| SenderCertificate | En matris med byte med noll längd |
| TimeToBeReceived | Message.InfiniteTimeout |
| TimeToReachQueue | Message.InfiniteTimeout |
| TransactionStatusQueue | null |
| UseAuthentication | false |
| UseDeadLetterQueue | false |
| UseEncryption | false |
| UseJournalQueue | false |
| UseTracing | false |
Se även
Gäller för
Message(Object)
Initierar en ny instans av klassen med hjälp Message av XmlMessageFormatter för att serialisera det angivna objektet i meddelandets brödtext.
public:
Message(System::Object ^ body);
public Message(object body);
new System.Messaging.Message : obj -> System.Messaging.Message
Public Sub New (body As Object)
Parametrar
- body
- Object
Objektet som ska serialiseras i meddelandets brödtext.
Exempel
Följande kodexempel skapar en ny kö, skickar ett meddelande som innehåller en order till den och hämtar den sedan.
#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
Kommentarer
Använd den här överlagringen Message för att skapa en ny instans av klassen som innehåller den Body som anges av parametern body . Parametern body kan vara alla objekt som kan serialiseras, till exempel en textsträng, ett strukturobjekt, en klassinstans eller ett inbäddat objekt. Brödtexten serialiseras med hjälp av XmlMessageFormatter såvida du inte ändrar Formatter egenskapen innan den Message skickas. Om du ändrar Body egenskapen eller Formatter när som helst innan du anropar Sendkommer meddelandet att serialiseras enligt det nya egenskapsvärdet.
Är XmlMessageFormatter löst kopplat, så det är inte nödvändigt att ha samma objekttyp på avsändaren och mottagaren när du använder det här formatet. Och ActiveXMessageFormatterBinaryMessageFormatter serialisera data till binär representation. ActiveXMessageFormatter Används vid sändning eller mottagning av COM-komponenter.
I följande tabell visas inledande egenskapsvärden för en instans av Message.
| Fastighet | Initialt värde |
|---|---|
| AcknowledgeType | AcknowledgeType.None |
| AdministrationQueue | null |
| AppSpecific | 0 |
| AttachSenderId | true |
| AuthenticationProviderName | Microsoft Base Cryptographic Provider version 1.0 |
| AuthenticationProviderType | CryptoProviderType.RSA_FULL |
| Body | Parametern body . |
| BodyStream | Stream.null |
| BodyType | 0 |
| ConnectorType | Guid.Empty |
| CorrelationId | En tom sträng ("") |
| DestinationSymmetricKey | En matris med byte med noll längd |
| DigitalSignature | En matris med byte med noll längd |
| EncryptionAlgorithm | EncryptionAlgorithm.RC2 |
| Extension | En matris med byte med noll längd |
| Formatter | XmlMessageFormatter |
| HashAlgorithm | HashAlgorithm.MD5 |
| Label | En tom sträng ("") |
| Priority | MessagePriority.Normal |
| Recoverable | false |
| ResponseQueue | null |
| SenderCertificate | En matris med byte med noll längd |
| TimeToBeReceived | Message.InfiniteTimeout |
| TimeToReachQueue | Message.InfiniteTimeout |
| TransactionStatusQueue | null |
| UseAuthentication | false |
| UseDeadLetterQueue | false |
| UseEncryption | false |
| UseJournalQueue | false |
| UseTracing | false |
Se även
Gäller för
Message(Object, IMessageFormatter)
Initierar en ny instans av Message klassen med den angivna formateringen för att serialisera det angivna objektet i meddelandets brödtext.
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)
Parametrar
- body
- Object
Objektet som ska serialiseras i meddelandets brödtext.
- formatter
- IMessageFormatter
En IMessageFormatter som anger den formatering som meddelandetexten ska serialiseras med.
Exempel
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
Kommentarer
Använd den här överlagringen Message för att skapa en ny instans av klassen som innehåller den Body som anges av parametern body och som använder valfri giltig formatering för att serialisera brödtexten. Parametern body är alla objekt som kan serialiseras, till exempel en textsträng, ett strukturobjekt, en klassinstans eller ett inbäddat objekt. Om du ändrar Body egenskapen eller Formatter när som helst innan du anropar Sendkommer meddelandet att serialiseras enligt det nya egenskapsvärdet.
Är XmlMessageFormatter löst kopplat, så det är inte nödvändigt att ha samma objekttyp på avsändaren och mottagaren när du använder det här formatet. Och ActiveXMessageFormatterBinaryMessageFormatter serialisera data till binär representation. ActiveXMessageFormatter Används vid sändning eller mottagning av COM-komponenter.
I följande tabell visas inledande egenskapsvärden för en instans av Message.
| Fastighet | Initialt värde |
|---|---|
| AcknowledgeType | AcknowledgeType.None |
| AdministrationQueue | null |
| AppSpecific | 0 |
| AttachSenderId | true |
| AuthenticationProviderName | Microsoft Base Cryptographic Provider version 1.0 |
| AuthenticationProviderType | CryptoProviderType.RSA_FULL |
| Body | Parametern body . |
| BodyStream | Stream.null |
| BodyType | 0 |
| ConnectorType | Guid.Empty |
| CorrelationId | En tom sträng ("") |
| DestinationSymmetricKey | En matris med byte med noll längd |
| DigitalSignature | En matris med byte med noll längd |
| EncryptionAlgorithm | EncryptionAlgorithm.RC2 |
| Extension | En matris med byte med noll längd |
| Formatter | Parametern formatter . |
| HashAlgorithm | HashAlgorithm.MD5 |
| Label | En tom sträng ("") |
| Priority | MessagePriority.Normal |
| Recoverable | false |
| ResponseQueue | null |
| SenderCertificate | En matris med byte med noll längd |
| TimeToBeReceived | Message.InfiniteTimeout |
| TimeToReachQueue | Message.InfiniteTimeout |
| TransactionStatusQueue | null |
| UseAuthentication | false |
| UseDeadLetterQueue | false |
| UseEncryption | false |
| UseJournalQueue | false |
| UseTracing | false |
Se även
- XmlMessageFormatter
- BinaryMessageFormatter
- ActiveXMessageFormatter
- DefaultPropertiesToSend
- MessageQueue
- Send(Object)
- Peek()
- Receive()