DotNetCore Console App with DI and ConfigurationBuilder

appsettings.json

{
	"test": "Hello from Core DI"
}

CustomService.cs

using Microsoft.Extensions.Configuration;
using System;

namespace CoreConsole {
	public interface ICustomService {

	}

	public class CustomService : ICustomService {
		public CustomService(IConfigurationRoot config) {
			Console.WriteLine(config["test"]);
		}
	}
}

Program.cs

using System;
using Microsoft.Extensions.DependencyInjection;

namespace CoreConsole {
	public class Program {
		public static void Main(string[] args) {
			IServiceCollection services = new ServiceCollection();
			Startup startup = new Startup();
			startup.ConfigureServices(services);
			IServiceProvider provider = services.BuildServiceProvider();

			// Test grabbing a service
			provider.GetRequiredService<ICustomService>();

			Console.WriteLine("Press any key to continue...");
			Console.ReadKey(true);
		}
	}
}

project.json

{
	"version": "1.0.0-*",
	"buildOptions": {
		"emitEntryPoint": true,
		"copyToOutput": {
			"include": "appsettings.json"
		}
	},

	"dependencies": {
		"Microsoft.Extensions.Configuration": "1.0.0",
		"Microsoft.Extensions.Configuration.Abstractions": "1.0.0",
		"Microsoft.Extensions.Configuration.Json": "1.0.0",
		"Microsoft.Extensions.DependencyInjection": "1.0.0",
		"Microsoft.Extensions.DependencyInjection.Abstractions": "1.0.0",
		"Microsoft.NETCore.App": {
			"type": "platform",
			"version": "1.0.0"
		}
	},

	"frameworks": {
		"netcoreapp1.0": {
			"imports": "dnxcore50"
		}
	}
}

Startup.cs

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace CoreConsole {
	public class Startup {
		IConfigurationRoot configuration { get; }

		public Startup() {
			var builder = new ConfigurationBuilder()
				.AddJsonFile("appsettings.json");

			configuration = builder.Build();
		}

		public void ConfigureServices(IServiceCollection services) {
			services.AddSingleton<IConfigurationRoot>(configuration);
			services.AddSingleton<ICustomService, CustomService>();
		}
	}
}