Dump C# provider info

Startup.cs

        var configuration = //... ;        
        foreach (IConfigurationProvider provider in configuration.Providers)
        {
            DumpProviderSource(dbg, "", provider);
        }

//

    private void DumpProviderSource(StringBuilder dbg, string indent, IConfigurationProvider provider)
    {
        dbg.AppendLine(indent + provider.GetType().FullName + ":");
        switch (provider)
        {
            case ChainedConfigurationProvider chainedConfigurationProvider:
                var config = typeof(ChainedConfigurationProvider).GetField("_config", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(chainedConfigurationProvider);
                switch (config)
                {
                    case ConfigurationRoot configurationRoot:
                        foreach (var childProvider in configurationRoot.Providers)
                        {
                            DumpProviderSource(dbg, indent + "  ", childProvider);
                        }
                        break;
                    case ConfigurationSection configurationSection:
                        dbg.AppendLine(indent + "  " + configurationSection.Key + " = " + configurationSection.Value);
                        break;
                    default:
                        break;
                }
                break;
            case MemoryConfigurationProvider memoryConfigurationProvider:
                foreach (var kv in memoryConfigurationProvider)
                {
                    dbg.AppendLine(indent + "  " + kv.Key + " = " + kv.Value);
                }
                break;
            // handled by ConfigurationProvider
            // case JsonConfigurationProvider jsonConfigurationProvider:
            //     break;
            // handled by ConfigurationProvider
            // case Microsoft.Extensions.Configuration.EnvironmentVariables.EnvironmentVariablesConfigurationProvider environmentVariablesConfigurationProvider:
            //     break;
            case ConfigurationProvider configurationProvider:
                var data = (IDictionary<string, string>)typeof(ConfigurationProvider).GetProperty("Data", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(configurationProvider);
                foreach (var kv in data)
                {
                    dbg.AppendLine(indent + "  " + kv.Key + " = " + kv.Value);
                }
                break;
            default:
                break;
        }
    }