ASP.Net Core MVC Dependency Injection not working

Question

I am trying to inject a interface into to my HomeController and I am getting this error:

InvalidOperationException: Unable to resolve service for type

Answer 1

In Core 2.0 it's recommended to use IConfiguration instead of IConfigurationRoot

public Startup(IConfiguration configuration)
{
    Configuration = configuration;
}

public IConfiguration Configuration { get; }

from https://docs.microsoft.com/en-us/aspnet/core/migration/1x-to-2x/#add-configuration-providers