GoogleMapsApi.Entities.DistanceMatrix.Request.DistanceMatrixRequest.GetQueryStringParameters C# (CSharp) Method

        protected override QueryStringParametersList GetQueryStringParameters()
        {
            if (Origins == null || !Origins.Any())
                throw new ArgumentException("Must specify an Origins");
            if (Destinations == null || !Destinations.Any())
                throw new ArgumentException("Must specify a Destinations");
            if (DepartureTime != null && ArrivalTime != null)
                throw new ArgumentException("Must not specify both an ArrivalTime and a DepartureTime");
            if (Mode != DistanceMatrixTravelModes.transit && ArrivalTime != null)
                throw new ArgumentException("Must not specify ArrivalTime for modes other than Transit");
            if (Mode != DistanceMatrixTravelModes.transit && TransitRoutingPreference != null)
                throw new ArgumentException("Must not specify TransitRoutingPreference for modes other than Transit");
            if (Mode != DistanceMatrixTravelModes.transit && TransitModes != null && TransitModes.Length > 0)
                throw new ArgumentException("Must not specify TransitModes for modes other than Transit");
            if ((!(Mode == null || Mode == DistanceMatrixTravelModes.driving) || DepartureTime == null)
                && TrafficModel != null)
                throw new ArgumentException("A TrafficModel must not be specified unless the Mode is Driving and a DepartureTime is provided");

            var parameters = base.GetQueryStringParameters();
            parameters.Add("origins", string.Join("|", Origins));
            parameters.Add("destinations", string.Join("|", Destinations));

            if (DepartureTime != null)
                parameters.Add("departure_time", DepartureTime.ToString());

            if (ArrivalTime != null)
                parameters.Add("arrival_time", ArrivalTime.ToString());

            if (Mode != null)
                parameters.Add("mode", Mode.ToString());

            if (TrafficModel != null)
                parameters.Add("traffic_model", TrafficModel.ToString());

            if (TransitRoutingPreference != null)
                parameters.Add("transit_routing_preference", TransitRoutingPreference.ToString());

            if (TransitModes != null && TransitModes.Length > 0)
                parameters.Add("transit_mode", string.Join("|", TransitModes.Select(a => a.ToString())));

            if (Avoid != null)
                parameters.Add("avoid", Avoid.ToString());

            if (Units != null)
                parameters.Add("units", Units.ToString());

            if (!string.IsNullOrWhiteSpace(Language))
                parameters.Add("language", Language);

            return parameters;
        }