MessageQueue::ReceiveById Method (String^, MessageQueueTransactionType)

 

Receives the message that matches the given identifier and immediately raises an exception if no message with the specified identifier currently exists in the queue.

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

public:
Message^ ReceiveById(
	String^ id,
	MessageQueueTransactionType transactionType
)

Parameters

id
Type: System::String^

The Id of the message to receive.

transactionType
Type: System.Messaging::MessageQueueTransactionType

One of the MessageQueueTransactionType values, describing the type of transaction context to associate with the message.

Return Value

Type: System.Messaging::Message^

The Message whose Id property matches the id parameter passed in.

Exception Condition
ArgumentNullException

The id parameter is null.

InvalidOperationException

The message with the specified id could not be found.

InvalidEnumArgumentException

The transactionType parameter is not one of the MessageQueueTransactionType members.

MessageQueueException

An error occurred when accessing a Message Queuing method.

Use this method to read a message with a known identifier and remove it from the queue. This method throws an exception immediately if the message is not in the queue. Otherwise, the message is removed from the queue and returned to the application using a transaction context defined by the transactionType parameter.

Specify Automatic for the transactionType parameter if there is already an external transaction context attached to the thread that you want to use to receive the message. Specify Single if you want to receive the message as a single internal transaction. You can specify None if you want to receive a message from a transactional queue outside of a transaction context.

The Id property of a message is unique across the Message Queuing enterprise, so there will be at most one message in the queue that matches the given id parameter. If the message with the specified identifier is in a queue other than the one associated with this MessageQueue instance, the message will not be found.

If this method is called to receive a message from a transactional queue, the message that is received would be returned to the queue if the transaction is aborted. The message is not permanently removed from the queue until the transaction is committed.

Two other methods allow you to receive messages from a queue. The Receive method returns the first message in the queue, and the ReceiveByCorrelationId(String^) method is used to retrieve an acknowledgment, report, or application-generated response message that was created as a result of a message sent to the queue.

To read a message with a specified identifier without removing it from the queue, use the PeekById(String^) method. The PeekById(String^) method always returns the first message in the queue, so subsequent calls to the method return the same message unless a higher priority message arrives in the queue. There is no transaction context associated with a message returned by a call to PeekById(String^). Because PeekById(String^) does not remove any messages in the queue, there would be nothing to roll back if the transaction were aborted.

The following table shows whether this method is available in various Workgroup modes.

Workgroup mode

Available

Local computer

Yes

Local computer and direct format name

Yes

Remote computer

No

Remote computer and direct format name

Yes

The following code example demonstrates the use of ReceiveById(String^, MessageQueueTransactionType).


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

// Create a new message.
Message^ msg = gcnew Message("Example Message Body");

// Send the message.
queue->Send(msg, "Example Message Label",
    MessageQueueTransactionType::Single);

// Get the message's Id property value.
String^ id = msg->Id;

// Simulate doing other work so the message has time to arrive.
System::Threading::Thread::Sleep(TimeSpan::FromSeconds(10.0));

// Receive the message from the queue.
msg = queue->ReceiveById(id, MessageQueueTransactionType::Single);

queue->Close();

.NET Framework
Available since 1.1
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