ASP .Net Core 2.0 - Reading appsettings.json from a non-parameterized class

I'm starting with an asp.net core 2.0 mvc web and I can not read directly from a class the value of the appsettings.json (ConnectionString) that I need.

I've found a lot of documentation, although none of them gets what I want. Summing up all the documentation that I have read, what the majority proposes is the following:

One of the many examples I found: link

The problem I have is that I am structuring the code in three layers (interface, business logic and data access) that call each other respectively and I do not see how to get to the access layer. data the connection string without having to send it by parameter through the different layers.

Right now the idea that I have in my head is to be able to read from the data access class the values of the appsettings.json, although if someone knows another better way to do it I would also like to know.

Thanks in advance.

Edit1:

AppSettings.cs

Class that I created to store appsettings.json data

public class AppSettings
{
    public Connection Connection { get; set; }
}

public class Connection
{
    public string ConnectionString { get; set; }
}

Startup.cs

I understand that here the "AppSettings" class is added to the service container.

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

public IConfiguration Configuration { get; }

// This method gets called by the runtime. Use this method to add services to the container.
// For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc();

    services.AddOptions();

    // Add appSettings
    services.Configure<AppSettings>(settings =>
    {
        settings.Connection = new Connection()
        {
            ConnectionString = Configuration["Data:DefaultConnection:ConnectionString"]
        };
    });

    services.AddSingleton<IConfiguration>(Configuration);
}

DataAccess.cs

Data access layer. Where I should be able to access AppSettings.

private readonly AppSettings _settings;

public DataAccess(IOptions<AppSettings> settings)
{
    _settings = settings.Value;
}

BusinessLogic.cs

Business layer, where I instantiate the data access layer. It generates a compilation error because there are missing parameters to send to the constructor, which seems logical to me. Maybe I can not understand the injection of dependencies very well.

public Business()
{
    Data = new DataAccess();
}

Edit2: This is how I have solved it, in case someone is good for something

Startup.cs

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

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
    public void ConfigureServices(IServiceCollection services)
    {
        // Add framework services
        services.AddMvc();

        // Configure AppSettings
        services.Configure<AppSettings>(settings =>
        {
            settings.Data = new Data()
            {
                ConnectionString = Configuration["Data:ConnectionString"].ToString()
            };
        });

        // Configure BusinessLogic
        services.AddSingleton<IBusinessLogic, BusinessLogic>();
        // Configure DataAccess
        services.AddSingleton<IDataAccess, DataAccess>();
    }

     public void Configure(IApplicationBuilder app, IHostingEnvironment env) ...
}

DataAccess.cs

public class DataAccess : IDataAccess
{
    private readonly AppSettings _settings;

    public DataAccess(IOptions<AppSettings> settings)
    {
        _settings = settings.Value;
    }

    public string GetConnectionString()
    {
        return _settings.Data.ConnectionString;
    }
}

  

In the data access layer I create a test method that returns the   connection string.

BusinessLogic.cs

public class BusinessLogic : IBusinessLogic
{
    private readonly IDataAccess _data;

    public BusinessLogic(IDataAccess data)
    {
        _data = data;
    }

    public string GetConnectionString()
    {
        return _data.GetConnectionString();
    }
}

  

In the business layer I create another test method that returns the   connection string. This in turn gets it from the data layer.

HomeController.cs

public class HomeController : Controller
{
    private readonly IBusinessLogic _businness;

    public HomeController(IBusinessLogic business)
    {
        _businness = business;
    }

    public IActionResult Index()
    {
        return View(new HomeModel(_businness.GetConnectionString()));
    }
}

  

In the Home view controller, I paint the chain of   connection obtained from the business layer.