MessageQueue::Receive Method (TimeSpan, Cursor^, MessageQueueTransactionType)
Receives the current message in the queue, using a specified cursor. If no message is available, this method waits until either a message is available, or the time-out expires.
Assembly: System.Messaging (in System.Messaging.dll)
public:
Message^ Receive(
TimeSpan timeout,
Cursor^ cursor,
MessageQueueTransactionType transactionType
)
Parameters
- timeout
-
Type:
System::TimeSpan
A TimeSpan that indicates the time to wait until a new message is available for inspection.
- cursor
-
Type:
System.Messaging::Cursor^
A Cursor that maintains a specific position in the message queue.
- transactionType
-
Type:
System.Messaging::MessageQueueTransactionType
One of the MessageQueueTransactionType values that describes the type of transaction context to associate with the message.
| Exception | Condition |
|---|---|
| ArgumentNullException | The cursor parameter is null. |
| ArgumentException | The value specified for the timeout parameter is not valid. Possibly timeout is less than TimeSpan::Zero or greater than MessageQueue::InfiniteTimeout. |
| InvalidEnumArgumentException | The transactionType parameter is not one of the MessageQueueTransactionType members. |
| MessageQueueException | A message did not arrive in the queue before the time-out expired. -or- An error occurred when accessing a Message Queuing method. |
Available since 2.0
The method is not thread safe.
Use this overload to receive a message from a queue using a transaction context defined by the transactionType parameter, and return in a specified period of time if there are no messages in the queue.
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 Receive method allows for the synchronous reading of a message, thereby removing it from the queue. Subsequent calls to Receive return the messages that follow in the queue.
If this method is called to receive a message from a transactional queue, the message that is received is returned to the queue if the transaction is aborted. The message is not permanently removed from the queue until the transaction is committed.
To read a message in a queue without removing it from the queue, use the Peek method. There is no transaction context associated with a message returned by a call to Peek. Because Peek does not remove any messages in the queue, there is nothing to roll back by a call to Abort.
Use a call to Receive when it is acceptable for the current thread to be blocked while it waits for a message to arrive in the queue. The thread is blocked for the given period of time, or indefinitely if you specified the value InfiniteTimeout for the timeout parameter. If the application processing should continue without waiting for a message, consider using the asynchronous method, BeginReceive.
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 |