Solve

/// <summary>

        /// Solves this instance.

        /// </summary>

        /// <returns>IFeatureClass.</returns>

        public IFeatureClass Solve()

        {

            log.WriteLog("Solving...");

            IGPMessages gpMessages = new GPMessagesClass();

            try

            {

                ConfigureSolverSettings();

                m_NAContext.Solver.Solve(m_NAContext, gpMessages, null);

                return m_NAContext.NAClasses.get_ItemByName("SALines") as IFeatureClass;

            }

            catch (Exception e)

            {

                log.WriteLog("GP执行失败：" + e.Message);

                return null;

            }

            finally

            {

                ////记录GPMessages

                string sGPMessages = GetGPMessagesAsString(gpMessages);

                log.WriteLog("GP执行信息：" + sGPMessages);

                log.WriteLog("Solve完成！");

            }

        }

/// <summary>

        /// Prepare the solver

        /// </summary>

        private void ConfigureSolverSettings()

        {

            ConfigureSettingsSpecificToServiceAreaSolver();

            ConfigureGenericSolverSettings();

            UpdateContextAfterChangingSettings();

        }

        /// <summary>

        /// Update settings that only apply to the Service Area

        /// </summary>

        private void ConfigureSettingsSpecificToServiceAreaSolver()

        {

            INAServiceAreaSolver naSASolver = m_NAContext.Solver as INAServiceAreaSolver;

            naSASolver.DefaultBreaks = ParseBreaks("");

            naSASolver.MergeSimilarPolygonRanges = false;

            naSASolver.OutputPolygons = esriNAOutputPolygonType.esriNAOutputPolygonNone;

            naSASolver.OverlapLines = false;

            naSASolver.SplitLinesAtBreaks = true;

            naSASolver.TravelDirection = esriNATravelDirection.esriNATravelDirectionFromFacility;

            naSASolver.OutputLines = esriNAOutputLineType.esriNAOutputLineTrueShape;

        }

        /// <summary>

        /// Update settings that apply to all solvers

        /// </summary>

        private void ConfigureGenericSolverSettings()

        {

            INASolverSettings naSolverSettings = m_NAContext.Solver as INASolverSettings;

            naSolverSettings.ImpedanceAttributeName = "Time";

            // set the oneway restriction, if necessary

            IStringArray restrictions = naSolverSettings.RestrictionAttributeNames;

            restrictions.RemoveAll();

            naSolverSettings.RestrictionAttributeNames = restrictions;

            //naSolverSettings.RestrictUTurns = esriNetworkForwardStarBacktrack.esriNFSBNoBacktrack;

        }

        /// <summary>

        /// When the solver has been update, the context must be updated as well

        /// </summary>

        private void UpdateContextAfterChangingSettings()

        {

            IDatasetComponent datasetComponent = m_NAContext.NetworkDataset as IDatasetComponent;

            IDENetworkDataset deNetworkDataset = datasetComponent.DataElement as IDENetworkDataset;

            m_NAContext.Solver.UpdateContext(m_NAContext, deNetworkDataset, new GPMessagesClass());

        }

/// <summary>

        /// Prepare the text string for breaks

        /// </summary>

        /// <param name="p">The p.</param>

        /// <returns>IDoubleArray.</returns>

        private IDoubleArray ParseBreaks(string p)

        {

            String[] breaks = p.Split(' ');

            IDoubleArray pBrks = new DoubleArrayClass();

            int firstIndex = breaks.GetLowerBound();

            int lastIndex = breaks.GetUpperBound();

            for (int splitIndex = firstIndex; splitIndex <= lastIndex; splitIndex++)

            {

                try

                {

                    pBrks.Add(Convert.ToDouble(breaks[splitIndex]));

                }

                catch (FormatException)

                {

                    log.WriteLog("Breaks are not properly formatted.  Use only digits separated by spaces");

                    pBrks.RemoveAll();

                    return pBrks;

                }

            }

            return pBrks;

        }

/// <summary>

        /// Gets the GP messages as string.

        /// </summary>

        /// <param name="gpMessages">The gp messages.</param>

        /// <returns>System.String.</returns>

        public string GetGPMessagesAsString(IGPMessages gpMessages)

        {

            // Gather Error/Warning/Informative Messages

            var messages = new StringBuilder();

            if (gpMessages != null)

            {

                for (int i = ; i < gpMessages.Count; i++)

                {

                    IGPMessage gpMessage = gpMessages.GetMessage(i);

                    string message = gpMessage.Description;

                    switch (gpMessages.GetMessage(i).Type)

                    {

                        case esriGPMessageType.esriGPMessageTypeError:

                            messages.AppendLine("Error " + gpMessage.ErrorCode + ": " + message);

                            break;

                        case esriGPMessageType.esriGPMessageTypeWarning:

                            messages.AppendLine("Warning: " + message);

                            break;

                        default:

                            messages.AppendLine("Information: " + message);

                            break;

                    }

                }

            }

            return messages.ToString();

        }