using System;

using Microsoft.Extensions.DependencyInjection;

public class Program

{

    public static void Main()

    {

        using (var rootServiceProvider = BuildServices())

        using (var rootScope = rootServiceProvider.CreateScope())

        {

            var provider = rootScope.ServiceProvider;

            var genericProductFileCreator = provider.GetRequiredService<IImportFileCreator<Product>>();

            var genericAssetFileCreator = provider.GetRequiredService<IImportFileCreator<Asset>>();

​

            genericProductFileCreator.TestMethod();

            genericAssetFileCreator.TestMethod();

        }

    }

​

    public static ServiceProvider BuildServices(Action<IServiceCollection> configure = null) {

        var services = new ServiceCollection();

        services.AddSingleton(typeof(IImportFileCreator<>), typeof(GenericImportFileCreator<>));

        if (configure != null) {

            configure(services);

        }

        return services.BuildServiceProvider();

    }

}

​

public interface IImportFileCreator<TEntity>

{

    TEntity Something { get; set; }

    void TestMethod();

}

public class GenericImportFileCreator<TEntity> : IImportFileCreator<TEntity>

{

    public TEntity Something {get; set; }

    public virtual void TestMethod()

    {

        Console.WriteLine("Generic import file creator handling " + typeof(TEntity).FullName + " entities");

    }

}

​

public class Product

{

}

​

public class Asset

{

}