/// <summary>
/// 根据车场编号获得所有有效帐期
/// </summary>
/// <param name="PKID">车场编号</param>
/// <returns></returns>
public static List <string> GetPriods(string PKID)
{
IParkSettlement factory = ParkSettlementFactory.GetFactory();
return(factory.GetPriods(PKID));
}