Question

I am confused right now, and maybe does not understand the real problem.

I have an object which require logger instance to log error data.

for example

public class CommonFileSaver : IFileSaver
    {
           private static ILog _log = LogManager.GetLogger();

           .....
    }

I wish to test the logging process. And my current decission is to use the mock of the ILog interface.

At this point I have decided to use Unity to resolve dependencies.

So the line

ILog _log = LogManager.GetLogger(); 

will look something like

ILog _log = Resolver.Instance.Resolve<ILoger>();

The question is how to setup the Unity container to return me new instance of the ILog object using LogManager factory.

Thank you.

P.S. ILog is the log4net interface, and the whole logging thing is implemented using log4net right now.

Answer 1

The problem here is that you’re not following the Hollywood principle. Static factory methods and singletons don’t fit well with dependency injection. You should change your code, to inject your ILog factory:

public class CommonFileSaver : IFileSaver
{
   public CommonFileSaver(ILogFactory logFactory)
   {
      _log = logFactory.GetLogger();
   } 

   private readonly ILog _log;

   .....
}