Hi I have many WCF services (SVC files), and I want to host them in IIS. I was wondering: Is it better to create each one on its own web site? or have them all together live on the same web site? What is the difference? I read that each service will have its own APP domain? Is there any articles that describe relation between WCF service and app domain?
Thanks
An application domain is used to isolate applications so that they do not affect each other. Having a separate website for each service therefore offers higher fault-tolerance, and enables you to update only the changing service without affecting the others. However deployment will require a little more work. Also probably more resources will be consumed and initialization will take a little longer (since more application domains will be created), but if it's not a time or performance-critical application those may not be of much concern to you.
I think if there's a good separation between your services, your services have a (subjectively) reasonable complexity and the resulting overhead is negligible for you, it would be better to go for separate websites, otherwise not. (Yeah, in summary, it depends.)
Note: You might also want to take a look at this article:
Hosting multiple WCF services as one single service