Using LightInject, how can I register a generic service with a factory method?

Question

I want to configure a logger that logs to xUnit test output, and should be substituted for all ILogger<T> dependencies. As far as I can tell, the way to solve this is to use a generic service with a factory method.

When using Microsoft.Extensions.DependencyInjection, I can do the following:

services.AddTransient(typeof(ILogger<>), 
  factory => factory.GetRequiredService<LoggerFactory>().CreateLogger("TestLogger"));

How can I achieve the same using LightInject?

EDIT: My example does not work, because the created logger cannot be cast to ILogger<T>. I have instead posted my workaround as a solution below.

Answer 1

Turns out I had to solve my problem in a different way:

1. I copied over XunitLogger from Microsoft.Extensions.Logging.Testing

2. I created a generic version:

   public class XunitLogger<T> : XunitLogger, ILogger<T>
   {
       public XunitLogger(ITestOutputHelper output) : base(output, typeof(T).Name, LogLevel.Information)
       {
       }
   }
   

3. I registered the test output helper and the logger:

   public TestBase(ITestOutputHelper testOutputHelper)
   {
       Container.RegisterInstance(testOutputHelper);
       Container.Register(typeof(ILogger<>), typeof(XunitLogger<>));
   }
   

The key here was that ILogger<T> must be implemented by a generic class, e.g. XunitLogger<T>. Now the messages are logged to my test output.