创建NetWorkDataset---Shapefile篇

部分参照esri的官方例子，理解下各个参数，对照自己的NetWorkDatase创建方式（在arcmap中），多试试代码就调好了。

 

/// <summary>

        /// 创建NetWorkDataset

        /// </summary>

        /// <returns>INetworkDataset.</returns>

        public INetworkDataset CreateNetWorkDataset()

        {

            log.WriteLog("开始创建NetWorkDataset...");

            //Create a new empty data element for a buildable network dataset.

            IDENetworkDataset2 deNetworkDataset = new DENetworkDatasetClass();

            deNetworkDataset.Buildable = true;

 

            string sNDPath = Functions.g_WorkSpacePath + Functions.g_ROAD + "_ND.nd\";

           

            if (System.IO.Directory.Exists(sNDPath))

            {

                try

                {

                    string[] strTemp = System.IO.Directory.GetFiles(sNDPath); //要先删除其下的所有子文件，然后删除目录，否则报错：System.IO.IOException: 目录不是空的

                    foreach (string str in strTemp)

                    {

                        System.IO.File.Delete(str);

                    }

 

                    System.IO.Directory.Delete(sNDPath);

                }

                catch (System.Exception ex)

                {

                    log.WriteLog(sNDPath + "已存在，删除失败！");

                    return null;

                }

            }

 

            // Open the shapefile and cast to the IGeoDataset interface.

            IWorkspaceFactory2 workspaceFactory = new ShapefileWorkspaceFactoryClass() asIWorkspaceFactory2;

            IWorkspace workspace = workspaceFactory.OpenFromFile(Functions.g_WorkSpacePath, 0);

            IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspace;

            IFeatureClass featureClass = featureWorkspace.OpenFeatureClass(Functions.g_ROAD);

            IGeoDataset geoDataset = (IGeoDataset)featureClass;

            deNetworkDataset.NetworkType = esriNetworkDatasetType.esriNDTShapefile;

 

            // Copy the shapefile's extent and spatial reference to the network dataset data element.

            IDEGeoDataset deGeoDataset = (IDEGeoDataset)deNetworkDataset;

            deGeoDataset.Extent = geoDataset.Extent;

            deGeoDataset.SpatialReference = geoDataset.SpatialReference;

            IDataElement dataElement = (IDataElement)deNetworkDataset;  // Specify the name of the network dataset.

            dataElement.Name = Functions.g_ROAD + "_ND";

 

            // Specify the network dataset's elevation model.

            deNetworkDataset.ElevationModel = esriNetworkElevationModel.esriNEMNone;

 

            // Create an EdgeFeatureSource object and point it to the Streets feature class.

            INetworkSource edgeNetworkSource = new EdgeFeatureSourceClass();

            edgeNetworkSource.Name = Functions.g_ROAD;

            edgeNetworkSource.ElementType = esriNetworkElementType.esriNETEdge;

 

            // Set the edge feature source's connectivity settings.

            IEdgeFeatureSource edgeFeatureSource = (IEdgeFeatureSource)edgeNetworkSource;

            edgeFeatureSource.UsesSubtypes = false;

            edgeFeatureSource.ClassConnectivityGroup = 1;

            edgeFeatureSource.ClassConnectivityPolicy =esriNetworkEdgeConnectivityPolicy.esriNECPEndVertex;

 

            IArray sourceArray = new ArrayClass();

            sourceArray.Add(edgeNetworkSource);

            deNetworkDataset.Sources = sourceArray;

 

            IArray attributeArray = new ArrayClass();

            IEvaluatedNetworkAttribute evalNetAttr;

            INetworkAttribute2 netAttr2;

            INetworkFieldEvaluator netFieldEval;

            INetworkConstantEvaluator netConstEval;

 

            // Create an EvaluatedNetworkAttribute object and populate its settings.

            evalNetAttr = new EvaluatedNetworkAttributeClass();

            netAttr2 = (INetworkAttribute2)evalNetAttr;

            netAttr2.Name = "Time"; //按秒算的时间消耗

            netAttr2.UsageType = esriNetworkAttributeUsageType.esriNAUTCost;

            netAttr2.DataType = esriNetworkAttributeDataType.esriNADTDouble;

            netAttr2.Units = esriNetworkAttributeUnits.esriNAUSeconds;

            netAttr2.UseByDefault = false;

 

            // Create evaluator objects and set them on the EvaluatedNetworkAttribute object.

            netFieldEval = new NetworkFieldEvaluatorClass();

            netFieldEval.SetExpression("a", "。。。。。。。。。。。"); //表达式不能出错

            evalNetAttr.set_Evaluator(edgeNetworkSource,esriNetworkEdgeDirection.esriNEDAlongDigitized, (INetworkEvaluator)netFieldEval);

 

            netFieldEval = new NetworkFieldEvaluatorClass();

            netFieldEval.SetExpression("a", "。。。。。。。。。");

            evalNetAttr.set_Evaluator(edgeNetworkSource,esriNetworkEdgeDirection.esriNEDAgainstDigitized, (INetworkEvaluator)netFieldEval);

 

            netConstEval = new NetworkConstantEvaluatorClass();

            netConstEval.ConstantValue = false;

            evalNetAttr.set_DefaultEvaluator(esriNetworkElementType.esriNETEdge, (INetworkEvaluator)netConstEval);

            evalNetAttr.set_DefaultEvaluator(esriNetworkElementType.esriNETJunction, (INetworkEvaluator)netConstEval);

            evalNetAttr.set_DefaultEvaluator(esriNetworkElementType.esriNETTurn, (INetworkEvaluator)netConstEval);

 

            // Add the attribute to the array.

            attributeArray.Add(evalNetAttr);

            deNetworkDataset.Attributes = attributeArray;

 

            //// Create a new UID that references the NetworkDatasetWorkspaceExtension. 

            UID ndWorkspaceExtensionUID = new UIDClass();

            ndWorkspaceExtensionUID.Value ="esriGeoDatabase.NetworkDatasetWorkspaceExtension";

            // Get the workspace extension and create the network dataset based on the data element.

            IWorkspaceExtensionManager workspaceExtensionManager = (IWorkspaceExtensionManager)workspace;

            IWorkspaceExtension workspaceExtension = workspaceExtensionManager.FindExtension(ndWorkspaceExtensionUID);

            IDatasetContainer3 datasetContainer2 = (IDatasetContainer3)workspaceExtension;

            IDEDataset deDataset = (IDEDataset)deNetworkDataset;

            IDataset ds = datasetContainer2.CreateDataset(deDataset);

            INetworkDataset networkDataset = (INetworkDataset)ds;

 

            log.WriteLog("NetWorkDataset创建完成，Building Network...");

 

            // Once the network dataset is created, build it.                                      

            INetworkBuild networkBuild = (INetworkBuild)networkDataset;

            networkBuild.BuildNetwork(geoDataset.Extent);

            log.WriteLog("BuildNetwork完成！");

 

            return networkDataset;

        }