How to inject dependency name as a constructor parameter

Question

Using Autofac, I can register a class to resolve against an interface using property injection, using the following code:

builder.RegisterType

        

Answer 1

You only use logName to effectively resolve by name an ILog, so why not just inject an ILog?

public class Log4NetAdapter : ILogger
{
    private readonly ILog _logger;

    public Log4NetAdapter(ILog logger)
    {
        _logger = logger;
    }

    ...
}

OK, so now I've just moved the problem a bit, but I've also made this less coupled to other classes, namely the LogManager.

So if I was using unity, I would then do this to ensure I get the right logger:

var childContainer = container.CreateChildContainer();
childContainer.RegisterInstance(LogManager.GetLogger(logName));
var adaptor = childContainer.Resolve();

The child container prevents any other code getting access to that ILog. You can do this as high up as you like, I don't know any more about your code.