how to check if you have already subscribed to EWS notifications/PushSubscriptionRequest
I am writing a service to listen to push notifications from EWS. I have a problem that If while running test runs, I restart the service, when I restart the service I send another PushSubscriptionRequest. Has anyone run into a similar problem? any hints?
If you need to pickup where your last subscription left off (after a host service restart) - you need a persistence mechanism to track the previous push subscription's SubscriptionID. According to TechNet - you cannot query the status of a PushSubscription, you can only set a StatusFrequency. From MSDN: A new SubscriptionId is created when you resubscribe. Use the watermark of a previous subscription to resubscribe at the point where the previous subscription ended.
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