How to use unity log4net extenstion in different layers

Question

I am using Unity.WwebAPI in my web api project. It is installed at Service level where i have my controller classes. Its all working fine.

Now i am trying to create a wrapper class in separate logging project so that i can use unity log4net extenstion across different layer in my solution.

How can i register unity log4net extenstion in my logging project? I know how to do it in UnityConfig file in service layer but i want to have this in logging project so that my log message method can be accessed in different layers

container.AddNewExtension< Log4NetExtension >();

Here is my test wrapper class;

Unity Log4Net wrapper class

 public class LogWrapper : ILogWrapper
{
    private readonly ILogWrapper _logWrapper;
    private ILog _log;

    public LogWrapper(ILogWrapper logWrapper)
    {
        _logWrapper = logWrapper;
    }

    public void LogMessage(string msg)
    {
        _log.Info(msg);
    }
}

Answer 1

Having the custom logger

Logging Project

public interface ILogger {
     void LogMessage(string msg);
}

so as not to couple your code to the 3rd party logger is a good idea.

Root Project

public class Log4NetWrapper : ILogger {
    private readonly ILog log; //log4net 

    public Log4NetWrapper(ILog log) {
        this.log = log;
    }

    public void LogMessage(string msg) {
        log.Info(msg);
    }

    //...
}

All that is left is to register your custom logger along with the 3rd party extension to the container in the composition root.

Root Project (Composition Root)

container = new UnityContainer();

//...

container.AddNewExtension<Log4NetExtension>();

//...

container.RegisterType<ILogger, Log4NetWrapper>(new HierarchicalLifetimeManager());

And use your internal logger where needed in the different layers.

public MyService(ILogger log) {
    //...
}

by using this abstraction the other layers do not need to know what is being used behind the scene to do the logging.

Only the composition root would need to be aware of the 3rd party dependency in order to register it with the IoC container.