Using structuremap with log4net wrapper

Question

I have the following interface:

public interface ILogger
{
    void Debug(string message, params object[] values);
    void Info(string message, params objec         


        

Answer 1

We use a similar ILogger wrapper around log4net and typically use constructor injection. We use an interceptor as a factory method responsible for creating the Logger. Here is our typical registry for logging setup.

public class CommonsRegistry : Registry
{
    public CommonsRegistry()
    {
        For()
            .AlwaysUnique()
            .TheDefault.Is.ConstructedBy(s =>
            {
                if (s.ParentType == null)
                    return new Log4NetLogger(s.BuildStack.Current.ConcreteType);

                return new Log4NetLogger(s.ParentType);
            });

        var applicationPath = Path.GetDirectoryName(Assembly.GetAssembly(GetType()).Location);
        var configFile = new FileInfo(Path.Combine(applicationPath, "log4net.config"));
        XmlConfigurator.ConfigureAndWatch(configFile);
    }
}

The parent type null check is necessary when there are dependencies on concrete types.

The rest is optional log4net setup stuff.

One thing I do like about this setup is the ability to use a null loggers for unit testing.