/// <summary>
/// 将当前租期续约一段时间
/// </summary>
/// <param name="timeSpan">续约时间</param>
/// <returns>返回续约后的到期时间</returns>
/// <exception cref="System.Exception">更新失败</exception>
public DateTime Renew(TimeSpan timeSpan)
{
return(_innerContainer.Renew(timeSpan));
}
