public static void PullOnly(
this IConfigurationPull pull,
Settings configuration,
params Expression<Func<Settings, object>>[] fields)
{
var names=fields.Select(z => z.Body as MemberExpression).Select(z => z.Member.Name).ToArray();
pull.Pull(configuration, names);
}
public static void PullAll(this IConfigurationPull pull, Settings configuration)
{
pull.Pull(configuration, null);
}