RegisterConfigurationOptions.cs

public static void RegisterConfigurationOptions<TOptions>(this ContainerBuilder builder, IConfiguration config) where TOptions : class
{
    if (builder == null)
    {
        throw new ArgumentNullException(nameof(builder));
    }

    if (config == null)
    {
        throw new ArgumentNullException(nameof(config));
    }

    builder.RegisterInstance(new ConfigurationChangeTokenSource<TOptions>(config))
        .As<IOptionsChangeTokenSource<TOptions>>()
        .SingleInstance();

    builder.RegisterInstance(new ConfigureFromConfigurationOptions<TOptions>(config))
        .As<IConfigureOptions<TOptions>>()
        .SingleInstance();
}