Check availability of WCF Callback Service

I have a service that uses callback operations to call back its client. Is there a away开发者_如何学Python to notify the client when Service goes down? An exception is raised when client goes down during callback, but with service goes down the subscription is lost but client is not notified.

Does WCF support some heartbeat operation to check the state of the service?

Thanks

No, there's no such thing as a "check if this service call will succeed" method.

You need to call the service and be prepared to handle any exceptions that occur during the service call.

There's really no reliable or useful way to check for service availability. All that a heartbeat could check for is that you can call your service method right now - but a fraction of a second later, that connection might be gone (cable has been unplugged or severed, server has crashed - the possibilities of things going wrong are endless......), too. It cannot check if all the necessary background services and databases etc. are available.

So in reality, such a heartbeat check is quite pointless. Just call the service, hope for the best, and be prepared for the worst! Wrap your service calls in good exception handling, and get on with it.