MsmqBindingBase.ExactlyOnce Property
Definition
Important
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Gets or sets a value that indicates whether messages processed by this binding are received exactly once.
public:
property bool ExactlyOnce { bool get(); void set(bool value); };public bool ExactlyOnce { get; set; }member this.ExactlyOnce : bool with get, setPublic Property ExactlyOnce As BooleanProperty Value
true if messages processed by this binding are received exactly once; otherwise, false. The default is true.
Remarks
A message can be sent with or without assurances. An assurance enables an application to ensure that a sent message reached the receiving message queue, or if it did not, the application can determine this by reading the dead-letter queue.
Messages sent with ExactlyOnce set to true must be sent to a transactional queue only.
ExactlyOnce, when set to true, indicates that Message Queuing (MSMQ) ensures that a sent message is delivered to the receiving message queue once and only once. If delivery fails, the message is sent to the dead-letter queue.
For messages that require ExactlyOnce to be false, the DeadLetterQueue property defaults to null.
For messages that require ExactlyOnce to be true, the DeadLetterQueue property defaults to a transactional system-wide dead-letter queue in MSMQ.
