Windows apps
Collapse the table of content
Expand the table of content
Information
Switch
Switch
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

MsmqBindingBase::ExactlyOnce Property

.NET Framework (current version)
 

Gets or sets a value that indicates whether messages processed by this binding are received exactly once.

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

C#
C++
F#
VB
Copy 
public:
property bool ExactlyOnce {
	bool get();
	void set(bool value);
}

Property Value

Type: System::Boolean

true if messages processed by this binding are received exactly once; otherwise, false. The default is true.

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.

.NET Framework
Available since 3.0
Return to top
Show:
© 2017 Microsoft