public City(Protobuf.City cityPb)
{
this.Id = cityPb.Id;
this.Name = cityPb.Name;
this.BusStation = (HashSet<BusStation>)cityPb.BusStation.Select(bs => new BusStation(bs));
}
public Protobuf.City ToPBMessage()
{
Protobuf.City cityPb = new Protobuf.City();
cityPb.Id = this.Id;
cityPb.Name = this.Name;
cityPb.BusStation.AddRange(this.BusStation.Select(bs => bs.ToPBMessage()));
return cityPb;
}