c#
internal static class MyExtensions
{
    internal static T Cast<T>(this GenericReadableRow r) where T : new()
    {
            var result = new T();

            foreach (var prop in typeof(T).GetProperties())
            {
                if (prop.GetCustomAttribute<ValueAttribute>() is ValueAttribute attr)
                {
                    prop.SetValue(result, r.Values[attr.Index]);
                }
            }

            return result;
    }
}

c#
internal static class MyExtensions
{
    internal static T Cast<T>(this GenericReadableRow r) where T : new()
    {
            var result = new T();

            foreach (var prop in typeof(T).GetProperties())
            {
                if (prop.GetCustomAttribute<ValueAttribute>() is ValueAttribute attr)
                {
                    prop.SetValue(result, r.Values[attr.Index]);
                }
            }

            return result;
    }
}