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'VB Imports System.Messaging
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Module Module1 Private Const cQueueName As String = ".\private$\ShippingInbox" Sub Main() Dim queue As MessageQueue queue = GetQueue() ' Enter a text for the body of the message
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Console.Write("Enter body: ")
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Dim body As String = Console.ReadLine()
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' Create message and set properties Dim msg As Message = New Message() msg.Body = body msg.Label = "Message from webapplication to shipping system." msg.Priority = MessagePriority.Normal msg.Recoverable = True msg.TimeToBeReceived = New TimeSpan(1, 0, 0, 0, 0) ' 1 day msg.UseDeadLetterQueue = True msg.UseJournalQueue = True ' Send the message using a single MSMQ transaction queue.Send(msg, MessageQueueTransactionType.Single) Console.WriteLine("Message is sent to queue.")
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Console.ReadLine()
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End Sub Private Function GetQueue() As MessageQueue
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Lesson 1: Message Queues
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End Function End Module //C# using System; using System.Messaging; namespace QueueSender { class Program { private const string cQueueName = @".\private$\ShippingInbox"; static void Main(string[] args)
MessageQueue queue;
queue = GetQueue();
// Enter a text for the body of the message
Console.Write("Enter body: ");
string body = Console.ReadLine();
// Create message and set properties
Message msg = new Message(); msg.Body = body;
msg.Label = "Message from webapplication to shipping system.";
msg.Priority = MessagePriority.Normal;
msg.Recoverable = true;
msg.TimeToBeReceived = new TimeSpan(1, 0, 0, 0, 0); // 1 day
msg.UseDeadLetterQueue = true;
msg.UseJournalQueue = true;
// Send the message using a single MSMQ transaction
queue.Send(msg, MessageQueueTransactionType.Single); Console.WriteLine("Message is sent to queue."); Console.WriteLine("Hit enter..."); Console.ReadLine(); }
/// <summary>
/// Get queue, create the queue if it does not exist.
/// </summary>
/// <returns></returns>
private static MessageQueue GetQueue()
//... } } }
13
Serviced Component Management
MessageQueueTransactionType can take one of the following options:
Automatic
A transaction type used for Microsoft Transaction Server (MTS). If there is already an MTS transaction context, it is used when sending or receiving the message. Use this in conjuction with the serviced component transactions you saw in 12. The Send operation is not transactional. In our case this results in a failure to send. A transaction type used for single internal transactions. The Send opera tion creates, begins, and commits an internal transaction for sending this single message.
None
Single
Figure 13-5 shows the result when we run the code and enter as the body the text Ship new camera to Mark Blomsma.
Figure 13-5 Run the application to send a message
After running the application you can check your results by opening the Computer Management console and checking the ShippingInbox queue to see that the message has been placed in the queue. Double-click the message to inspect its properties. On the Body tab, you can actually inspect the contents of the message, and as you can see in Figure 13-6, the string has been serialized as Extensible Markup Language (XML).
Lesson 1: Message Queues
Figure 13-6 The body of the message is serialized as XML
When sending a message, the body of the message is by default serialized as XML. It is also possible to send a binary representation of an object as a message. To do so, you need to utilize the BinaryMessageFormatter, which is part of the System.Messaging namespace. In the following code, notice that instead of putting a string in the body of the message we create an instance of a custom type named ShippingOrder and set the properties of the object (bold is used to emphasize the relevant portions). Set the body of message by using the Write method on the BinaryMessageFormatter. Note that the ShippingOrder class needs to be marked as serializable using the Serial izableAttribute; otherwise, the BinaryMessageFormatter won t be able serialize the order.
'VB Imports System.Messaging
Module Module1 Private Const cQueueName As String = ".\private$\ShippingInbox" Sub Main() Dim queue As MessageQueue queue = GetQueue()
13
Serviced Component Management
' Enter a text for the body of the message
Console.Write("Enter to: ")
Dim shipTo As String = Console.ReadLine()
Dim order As QueueData.ShippingOrder = New QueueData.ShippingOrder() order.Id = 1
order.ArticleId = 555
order.Quantity = 1
order.ShipTo = shipTo
' Create message and set properties Dim msg As Message = New Message() SetMessageProperties(msg) ' Use the binary formatter for filling the body of the message Dim formatter As BinaryMessageFormatter = New BinaryMessageFormatter() formatter.Write(msg, order) ' Send the message using a single MSMQ transaction queue.Send(msg, MessageQueueTransactionType.Single) Console.WriteLine("Message is sent to queue.") Console.WriteLine("Hit enter...") Console.ReadLine() End Sub Private Sub SetMessageProperties(ByVal msg As Message) '... End Sub Private Function GetQueue() As MessageQueue
'...
End Function
End Module
//C# using System;
using System.Messaging;
namespace QueueSender {
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