protected virtual IEnumerable <string> GetParts()
{
if (Select.Any())
{
yield return("$select=" + String.Join(",", Select));
}
if (Expand.Any())
{
yield return("$expand=" + String.Join(",", Expand.Select(e => $"{e.PropertyName}({e})")));
}
if (Filter.Any())
{
yield return("$filter=" + String.Join(" and ", Filter));
}
}
