public virtual UpnpNt GetByNtType(UpnpNt.NtType ntType) => (this.UpnpType.Type == ntType) ? this.UpnpType : null;
public override UpnpNt GetByNtType(UpnpNt.NtType ntType) => (this.UpnpId.Type == ntType) ? this.UpnpId : base.GetByNtType(ntType);