这种情况，GetHaseCode该如何实现?

gistfile1.cs

    public class FlightsPlanEqualityComparer : IEqualityComparer<FlightsPlan>
    {
        public bool Equals(FlightsPlan x, FlightsPlan y)
        {
            if (x.Flights.Count != y.Flights.Count)
            {
                return false;
            }

            for (int i = 0; i < x.Flights.Count; i++)
            {
                var fx = x.Flights[i];
                var fy = y.Flights[i];

                if (fx.FlightNo != fy.FlightNo || fx.FlightSeat != fy.FlightSeat)
                { 
                    return false;
                }
            }

            return true;
        }

        public int GetHashCode(FlightsPlan obj)
        {
            // FardId是FlightsPlan的唯一标识
            //return obj.FareId.GetHashCode();
        }
    }

return obj.FlightNo.GetHashCode()^obj.FlightSeat.GetHashCode()

再加上那个count，没看到第一个判断