DI-friendly Factory Pattern in C#

di-friendly-factory.cs

public class DIFriendlyDocumentProcessorFactory : IDocumentProcessorFactory
{
    private readonly Dictionary<string, Func<IDocumentProcessor>> _factories;

    public DIFriendlyDocumentProcessorFactory(Dictionary<string, Func<IDocumentProcessor>> factories)
    {
        _factories = factories;
    }

    public IDocumentProcessor Create(string type)
    {
        if (!_factories.TryGetValue(type, out var factory) || factory is null)
            throw new ArgumentOutOfRangeException(nameof(type), $"type '{type}' is not registered");
        return factory();
    }
}

Startup.cs

.ConfigureServices((hostContext, services) =>
  {
      services.AddTransient<PdfReader>()
              .AddTransient<PdfProcessor>()
              .AddTransient<OdtReader>()
              .AddTransient<OdtProcessor>();

      services.AddSingleton<WordReader>()
              .AddSingleton<WordProcessor>();

      services.AddSingleton<IDocumentProcessorFactory>(ctx =>
      {
          var factories = new Dictionary<string, Func<IDocumentProcessor>>()
          {
              ["pdf"] = () => ctx.GetService<PdfProcessor>(),
              ["odt"] = () => ctx.GetService<OdtProcessor>(),
              ["doc"] = () => ctx.GetService<WordProcessor>()
          };
          return new DIFriendlyDocumentProcessorFactory(factories);
      });
  });