so gross

eww.cs

using System.Configuration;
using System.IO;
using Microsoft.Extensions.Configuration;
using ConfigurationBuilder = Microsoft.Extensions.Configuration.ConfigurationBuilder;
using OldConfigurationManager = System.Configuration.ConfigurationManager;

namespace JsonConfigBridge
{
    public class Class1
    {
        // Per JBAI (Thanks btw!)
        /*
         * Remember that System.Configuration.ConfigurationManager.AppSettings is read-only in runtime,
         * so this piece of code should be performed before any reads from ConfigurationManager.AppSettings.
         * Note: It's a best practice to read configurations at the startup of your application
         */
        public void derp()
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json");
            IConfiguration configuration = builder.Build();
            foreach (var configurationSection in configuration.GetChildren())
            {
                LoadConfigToAppSettings(configurationSection,configurationSection.Key);
            }
            foreach (var child in configuration.GetSection("ApplicationSettings")
                         .GetChildren())
            {
                OldConfigurationManager.AppSettings[child.Key] = child.Value;
            }

            foreach (var cstr in configuration.GetSection("ConnectionStrings").GetChildren())
            {
                OldConfigurationManager.AppSettings[cstr.Key] = cstr.Value;
            }
            
            
        }
        
        void LoadConfigToAppSettings(IConfigurationSection section, string parentKey = "")
        {
            foreach (var child in section.GetChildren())
            {
                var key = (string.IsNullOrEmpty(parentKey)? "" : $"{parentKey}:") + child.Key;
                if (child.Value == null) // It's a section
                    LoadConfigToAppSettings(child, key);
                else
                    OldConfigurationManager.AppSettings[key] = child.Value;
            }
        }
    }
}