Export (0) Print
Expand All

Message Constructor

Initializes a new instance of the Message class with an empty body.

Namespace:  System.Messaging
Assembly:  System.Messaging (in System.Messaging.dll)

public Message()

Use this overload to create a new instance of the Message class that has an empty body.

Specify either the Body property or the BodyStream property before sending the Message object. The Body property can be any object that can be serialized, such as a text string, a structure object, a class instance, or an embedded object.

Unless you write the contents of the message directly to the BodyStream property, set the Formatter property before you send the message. The body is serialized using the Formatter property's value at the time the Send method is called on the MessageQueue instance.

The XmlMessageFormatter is loosely coupled, so it is not necessary to have the same object type on the sender and receiver when using this format. The ActiveXMessageFormatter and BinaryMessageFormatter serialize the data into binary representation. The ActiveXMessageFormatter is used when sending or receiving COM components.

The following table shows initial property values for an instance of Message.

Property

Initial value

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

An empty string ("")

DestinationSymmetricKey

A zero-length array of bytes

DigitalSignature

A zero-length array of bytes

EncryptionAlgorithm

EncryptionAlgorithm.RC2

Extension

A zero-length array of bytes

Formatter

XmlMessageFormatter

HashAlgorithm

HashAlgorithm.MD5

Label

An empty string ("")

Priority

MessagePriority.Normal

Recoverable

false

ResponseQueue

null

SenderCertificate

A zero-length array of bytes

TimeToBeReceived

Message.InfiniteTimeout

TimeToReachQueue

Message.InfiniteTimeout

TransactionStatusQueue

null

UseAuthentication

false

UseDeadLetterQueue

false

UseEncryption

false

UseJournalQueue

false

UseTracing

false

The following code example sends two messages of different priorities to the queue, and retrieves them subsequently.

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;
		}
	}
}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Show:
© 2014 Microsoft