private Double? GetElementLength(Element element)
{
    var lengthParam = Enum.GetValues(typeof (BuiltInParameter))
                .OfType<BuiltInParameter>()
                .Where(p => p.ToString().Contains("LENGTH"))
                .Select(param => element.get_Parameter(param))
                .Where(param => param != null)
                .FirstOrDefault();

            if (lengthParam != null)
            {
                var lengthValue = lengthParam.AsDouble();
                return lengthValue;
            }

            return null;
}