Is it intended that if a Subscription does not exist a ServiceBusCommunicationEx is thrown instead of a MessagingEntityNotFoundEx?

Query/Question Is it intended that if a Subscription does not exist a ServiceBusCommunicationEx is thrown rather than a MessagingEntityNotFoundException?

Why is this not a Bug or a feature Request? Our team is currently building a wrapper around the Microsoft.Azure.ServiceBus project and have noticed that when a Topic or Queue does not exist a MessagingEntityNotFoundException is thrown whereas when a Subscription does not exists a ServiceBusCommunicationException is thrown.

Is this intended and if yes why so?.. Doesn’t a Topic + Subscription make up a Messaging Entity?

Setup

• OS: Windows 10 version 1809
• IDE : Visual Studio Enterprise 2019
• Version of the Library used: 3.4.0

protected override void SubscribeInternal()
{
	RetryExponential retryExponential = new RetryExponential(TimeSpan.FromSeconds(5), TimeSpan.FromSeconds(20), 3);

	string topicName = "TestTopic";
	//This subscription has not been created
	string subscriptionName = "Sub1";

        _azureSubscriptionClient = new SubscriptionClient(this._getConnectionString(), topicName, subscriptionName, ReceiveMode.PeekLock, retryExponential);
	MessageHandlerOptions messageHandlerOptions = new MessageHandlerOptions(_onExceptionThrownHandler)
	{                   
	    MaxConcurrentCalls = _topicSubscriptionConnectionOptions.MaxConcurrentMessages,                   
	    AutoComplete = false
	};
	_azureSubscriptionClient.RegisterMessageHandler(_onMessageReceivedHandler, messageHandlerOptions);
}

private Task _onExceptionThrownHandler(ExceptionReceivedEventArgs exceptionReceivedEventArgs)
{
    Exception exception = exceptionReceivedEventArgs.Exception;
    //exception.GetType() == 'ServiceBusCommunicationException'
    ...
}

private async Task _onMessageReceivedHandler(Message message, CancellationToken token)
{
    ...
}

[axisc]

@TheReaLee - thanks for raising this.

I think this is definitely a MessagingEntityNotFoundException. Adding it to the backlog and assigning the January milestone to it.

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