WCF Service Testability and Dependency Injection?

One approach you can take is to inject a repository factory in your service class and then call/get your repository from the factory.

I would recommend using the Dependency Inversion Principle: Have your repositories implement a specific interface, then have your service classes take in an object (or objects) of that interface (or interfaces). Do not have it directly reference the concrete class. Then, all you'd need to do on your service class is call a method that's exposed by the interface to bring up any/all of the information that you want.

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