NLog: Dependency Injection for custom Targets

Question

I am a user of NLog and I am creating my own custom target. This target will use some repositories (using NHibernate) to persist log entries.

Is it possible to inje

Answer 1

I want to provide some context for people, since I was confused at first by your answer JC.

public Program {

    //
    // Static constructor
    //
  static Program() {
    // Set up Ninject
    var kernel = new StandardKernel();

    // Register bindings
    RegisterServices(kernel);

    // Set up Ninject logging config
    NLog.Config.ConfigurationItemFactory.Default.CreateInstance = 
        (type) => kernel.TryGet(type);

    // Continue on!
  }

  private static void RegisterServices(IKernel kernel) {
    // bind services!
    kernel.Bind<IMyClass>().To<MyClass>();
  }
}

[Target("Custom")]
public class CustomTarget : TargetWithLayout {

    private IMyClass _myClass;
    public CustomTarget(IMyClass myClass) {

        // This will be injected!
        _myClass = myClass;
    }
}

This shows how you set up the instance creation and how it all fits together with NLog. Hope that helps other people!

Answer 2

The author of the toolkit updated the framework to expose hooks for using your own DI container. The following is one possible usage:

   public class LoggingConfiguration : ILoggingConfiguration
{
    public void SetDependencyResolver(IContainer container)
    {
        ConfigurationItemFactory.Default.CreateInstance = (Type type) => container.GetInstance(type);
    }
}

public static class DiagnosticsConfiguration
{
    public static void Configure(Action<ILoggingConfiguration> configuration)
    {
        var config = new LoggingConfiguration();
        configuration(config);
    }
}

public interface ILoggingConfiguration
{
    void SetDependencyResolver(IContainer container);
}

public interface IContainer
{
    object GetInstance(Type type);
}

public class StructureMapDependencyFactory : IContainer
{
    public object GetInstance(Type type)
    {
        return ObjectFactory.GetInstance(type);
    }

    public T GetInstance<T>()
    {
        return ObjectFactory.GetInstance<T>();
    }
}

Hopefully this will help out someone.

J