MessageQueue.Send Method (Object, String, MessageQueueTransaction)
Sends an object to the transactional queue referenced by this MessageQueue and specifies a label for the message.
Assembly: System.Messaging (in System.Messaging.dll)
'Declaration Public Sub Send ( _ obj As Object, _ label As String, _ transaction As MessageQueueTransaction _ )
The label parameter is Nothing.
The transaction parameter is Nothing.
The Path property has not been set.
The Message Queuing application indicated an incorrect transaction usage.
An error occurred when accessing a Message Queuing method.
Use this overload to send a message that contains the obj parameter to the transactional queue referenced by the MessageQueue, using an internal transaction context defined by the transaction parameter. With this overload, you can specify the string label that identifies the message. The object you send to the queue can be a Message, a structure, a data object, or any managed object. If you send any object other than a Message, the object is serialized and inserted into the body of the message.
The message label is distinct from the message queue label, but both are application-dependent and have no inherit meaning to Message Queuing.
If you use this overload to send a message to a non-transactional queue, the message might be sent to the dead-letter queue without throwing an exception.
The DefaultPropertiesToSend property applies to any object other than a Message. If you specify, for example, a label or a priority using the DefaultPropertiesToSend member, these values apply to any message that contains an object that is not of type Message when your application sends it to the queue. When sending a Message, the property values set for the Message take precedence over DefaultPropertiesToSend and the message's Message.Formatter property takes precedence over the queue's MessageQueue.Formatter property
MessageQueueTransaction is threading apartment aware, so if your apartment state is STA, you cannot use the transaction in multiple threads. Visual Basic sets the state of the main thread to STA, so you must apply the MTAThreadAttribute in the Main subroutine. Otherwise, sending a transactional message using another thread throws a MessageQueueException exception. You apply the MTAThreadAttribute by using the following fragment.
<System.MTAThreadAttribute> public sub Main()
The following table shows whether this method is available in various Workgroup modes.
Local computer and direct format name
Remote computer and direct format name