using System;

using Unity;

using Unity.Injection;

public class Program

{

    public static void Main()

    {

        var container = new UnityContainer();

        container.RegisterType<IDbContext, AuthenticationContext>(typeof(AuthenticationContext).ToString(), new InjectionConstructor(AppConstants.AuthenticationKey));

        container.RegisterType<IDbContext, ApplicationContext>(typeof(ApplicationContext).ToString(), new InjectionConstructor(AppConstants.ApplicationKey));

        var factory = new DbContextFactory(container);

        var context = factory.CreateContext<AuthenticationContext>();

        context.Test();

    }

}

​

public class DbContextFactory

{

    private readonly IUnityContainer _container;

    public DbContextFactory(IUnityContainer container) 

    {

        _container = container;

    }

    public IDbContext CreateContext<TDbContext>() where TDbContext : IDbContext 

    {

        var key = typeof(TDbContext).ToString();

        return _container.Resolve<TDbContext>(key);

    }

}

​

public class AuthenticationContext : DbContextWrapper

{

    public AuthenticationContext(string connectionString) : base(connectionString)

    {

    }

}

​

public class ApplicationContext : DbContextWrapper

{

    public ApplicationContext(string connectionString) : base(connectionString)

    {

    }

}

​

public class DbContextWrapper : IDbContext 

{

    private readonly string _connectionString;

    public DbContextWrapper(string connectionString)

    {

        _connectionString = connectionString;

    }

    public void Test()

    {

        Console.WriteLine(_connectionString);

    }

}

​

public interface IDbContext 

{   

    void Test();

}

​

public class AppConstants 

{

    public static string AuthenticationKey = "Authentication.Connection";

    public static string ApplicationKey = "Application.Connection";

}