using System;

using System.Runtime.CompilerServices;

using System.Runtime.InteropServices;

using Microsoft.Extensions.Configuration;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

​

public class Program

{

    public static void Main()

    {

        var config = new ConfigurationBuilder()

            .AddInMemoryCollection(new Dictionary<string, string?>()

            {

                ["ConnectionStringOptions:TestA:Data Source:Provider"] = "registry",

                ["ConnectionStringOptions:TestA:Data Source:Key"] = "hkcu:/Software/Test@Value",

                ["ConnectionStringOptions:TestB:Data Source"] = "source"

            })

            .Build();

        foreach (var connectionOptions in config.GetSection("ConnectionStringOptions").GetChildren())

        {

            var connectionString = connectionOptions.Key;

            foreach (var option in connectionOptions.GetChildren())

            {

                var value = option.Value;

                var sourcePath = option.Get<ExternalValue>();

                Console.WriteLine($"connectionString = '{connectionString}'");

                Console.WriteLine($"option = '{option.Key}'");

                Console.WriteLine($"value = '{value}'");

                Console.WriteLine($"sourcePath = '{sourcePath}'");

                Console.WriteLine("----------------------------------");

            }

        }

    }

    public record class ExternalValue(string Provider, string Key);

}