WCF Service Address on Azure Website - wcf

Question

I am planning to run a WCF service with netTcpRelayBinding on azure website.
One of the interesting feature that azure website allows is to update the appsettings & swap between live and staging environment.
The problem that I am having is how can I change the address of service bus address when I swap from staging to production and vice versa. I think one way to achieve is by having the service address in appsettings.
Note: I can achieve this with web.config transform and redeployment. However we are trying to avoid redeployment.
The problem with example:
<services>
<service name="Hwo.LocationService.Wcf.HotelLocationService">
<endpoint address="sb://staging.servicebus.windows.net/IHotelLocationService"
binding="netTcpRelayBinding"
contract="Hwo.ProductInterface.Common.Azure.Contracts.IHotelLocationService"
name="HotelLocationServiceEndPoint" />
</service>
...
As it can seen above, the address is pointing to staging environment. But when we swap that that application in production , the address wont change. We would like to change that endpoint address when we swap.
Is this possible?
Thanks.

Answer 1

Due to it can swap the App settings, so I suggest you can write your Address value into App settings in web.config file. Meanwhile, you need read the address value and set it as your service's endpoint in your code. If you swap the slots, you just modify the App Setting on the Azure portal.
Read config:
WebConfigurationManager.AppSettings["configFile"]
Modify the settings:
[Update]
Please refer to this document to dynamically set your endpoint on different enviroment(https://blogs.msdn.microsoft.com/carlosfigueira/2011/06/13/wcf-extensibility-servicehostfactory/)

Answer 2

With advise from Will, I managed to write service host factory which solves the problem the perfectly.
Here is the code:
protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
{
var serviceHost = new ServiceHost(serviceType, baseAddresses);
var serviceEndpoint = serviceHost.AddServiceEndpoint(serviceType.GetInterfaces().First(),
new NetTcpRelayBinding("netTcpRelayBinding"),
ConfigurationManager.AppSettings["ServiceBus.Address"] + serviceType.Name);
serviceEndpoint.Behaviors.Add(
new TransportClientEndpointBehavior(
TokenProvider.CreateSharedAccessSignatureTokenProvider(
ConfigurationManager.AppSettings["ServiceBus.Key"],
ConfigurationManager.AppSettings["ServiceBus.Value"])));
return serviceHost;
}
Thanks.