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POOrdered Delivery with netMSMQbinding
 

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    <p>Is it possible to guarantee ordered delivery when using WCF netMSMQbinding?</p> <p>We are putting an insert command followed by a number of update commands on the same queue, and occassionally one of the updates beats the insert.</p> <p>Having added extensive logging it is clear that they are being added to the queue in the correct order and being processed in a different order.</p> <p>I have managed to Google a couple of articles that state that this behaviour is expected, but it seems like it must be possible to configure it to be ordered somehow.</p> <p>Our queues are transactional, so I don't think that adding sequence numbers and resequencing at the destination is going to work, as that would lose out transactionality</p> <p>If I add the attribute <code>[DeliveryRequirements(RequireOrderedDelivery=true, QueuedDeliveryRequirements=QueuedDeliveryRequirementsMode.Require)]</code> I get the following error:</p> <blockquote> <p>The DeliveryRequirementsAttribute on contract 'IService' specifies a QueuedDeliveryRequirements value of NotAllowed. However, the configured binding for this contract specifies that it does support queued delivery. A queued binding may not be used with this contract.</p> </blockquote> <p>I have no idea why we get this error, as everything "appears" to be setup correctly. I haven't managed to find any confirmation that this setting is allowed for MSMQ though, as it appears to be a WS-RM setting, and AFAIK netMSMQBinding does not support WS-RM.</p>
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