Creating a network dataset programmatically

SmitaSathe — Mon, 08 Dec 2014 08:37:40 GMT

I am running into a problem with creating and building a network dataset programmatically. My feature dataset is hosted in an SDE database and I need to build a network dataset for it. I have version 10.2.1 installed. I have the following code to do it. I get an error at the very end of the function when CreateDataset is called:

Exception from HRESULT: 0x80040220

I got most of this code from the ESRI site and adapted it to my situation. I have not been able to figure out what the problem is. If someone could help me, I would be most obliged.

Thanks in advance....

Smita

public static void CreateAndBuildNetworkDataset(IDatasetName datasetName)

{

IFeatureClass featureClass;

try

{

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

IDENetworkDataset2 deNetworkDataset = new DENetworkDatasetClass();

deNetworkDataset.Buildable = true;

IDataset dataset = null;

IFields iFields;

OpenTableOrFeatureClass(datasetName, out iFields, out dataset);

featureClass = dataset as IFeatureClass;

IGeoDataset geoDataset = (IGeoDataset)dataset;

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

IDEGeoDataset deGeoDataset = (IDEGeoDataset)deNetworkDataset;

deGeoDataset.Extent = geoDataset.Extent;

deGeoDataset.SpatialReference = geoDataset.SpatialReference;

// Specify the name of the network dataset.

IDataElement dataElement = (IDataElement)deNetworkDataset;

dataElement.Name = string.Format("{0}_ND", datasetName.Name);

//Specify network sources

//*****************************************************************

// Specify the network dataset's elevation model.

deNetworkDataset.ElevationModel = esriNetworkElevationModel.esriNEMElevationFields;

deNetworkDataset.NetworkType = esriNetworkDatasetType.esriNDTGeodatabase;

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

IEdgeFeatureSource streetsEdgeFeatureSource = new EdgeFeatureSourceClass();

INetworkSource streetsNetworkSource = (INetworkSource)streetsEdgeFeatureSource;

streetsNetworkSource.Name = dataset.Name;

streetsNetworkSource.ElementType = esriNetworkElementType.esriNETEdge;

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

streetsEdgeFeatureSource.UsesSubtypes = false;

streetsEdgeFeatureSource.ClassConnectivityGroup = 1;

streetsEdgeFeatureSource.ClassConnectivityPolicy =

esriNetworkEdgeConnectivityPolicy.esriNECPEndVertex;

streetsEdgeFeatureSource.FromElevationFieldName = "FromElevation";

streetsEdgeFeatureSource.ToElevationFieldName = "ToElevation";

//Specifying directions settings

// Create a StreetNameFields object and populate its settings for the Streets source.

IStreetNameFields streetNameFields = new StreetNameFieldsClass();

streetNameFields.Priority = 1; // Priority 1 indicates the primary street name.

streetNameFields.StreetNameFieldName = "StreetName";

streetNameFields.PrefixTypeFieldName = "PrefixType";

// Add the StreetNameFields object to a new NetworkSourceDirections object,

// then add it to the EdgeFeatureSource object created earlier.

INetworkSourceDirections streetNetworkSourceDirections = new

NetworkSourceDirectionsClass();

IArray streetNameFieldsArray = new ArrayClass();

streetNameFieldsArray.Add(streetNameFields);

streetNetworkSourceDirections.StreetNameFields = streetNameFieldsArray;

streetsNetworkSource.NetworkSourceDirections = streetNetworkSourceDirections;

IArray sourceArray = new ArrayClass();

sourceArray.Add(streetsNetworkSource);

deNetworkDataset.Sources = sourceArray;

//*********************************************************************************

//global turns

deNetworkDataset.SupportsTurns = true;

//Attributes

IArray attributeArray = new ArrayClass();

// Initialize variables reused when creating attributes.

IEvaluatedNetworkAttribute evalNetAttr;

INetworkAttribute2 netAttr2;

INetworkFieldEvaluator netFieldEval;

INetworkConstantEvaluator netConstEval;

//Length field

// Create an EvaluatedNetworkAttribute object and populate its settings.

evalNetAttr = new EvaluatedNetworkAttributeClass();

netAttr2 = (INetworkAttribute2)evalNetAttr;

netAttr2.Name = "Length";

netAttr2.UsageType = esriNetworkAttributeUsageType.esriNAUTCost;

netAttr2.DataType = esriNetworkAttributeDataType.esriNADTDouble;

netAttr2.Units = esriNetworkAttributeUnits.esriNAUMeters;

netAttr2.UseByDefault = true;

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

netFieldEval = new NetworkFieldEvaluatorClass();

netFieldEval.SetExpression("[Shape]", "");

//netFieldEval.SetExpression("[SpeedLimit]", "");

evalNetAttr.set_Evaluator(streetsNetworkSource,

esriNetworkEdgeDirection.esriNEDAlongDigitized, (INetworkEvaluator)netFieldEval);

evalNetAttr.set_Evaluator(streetsNetworkSource,

esriNetworkEdgeDirection.esriNEDAgainstDigitized, (INetworkEvaluator)

netFieldEval);

netConstEval = new NetworkConstantEvaluatorClass();

netConstEval.ConstantValue = 0;

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 NetworkDirections object and populate its settings.

INetworkDirections networkDirections = new NetworkDirectionsClass();

networkDirections.DefaultOutputLengthUnits = esriNetworkAttributeUnits.esriNAUMiles;

networkDirections.LengthAttributeName = "Length";

//networkDirections.TimeAttributeName = "TravelTimeSeconds";

//networkDirections.RoadClassAttributeName = "RoadClass";

// Add the NetworkDirections object to the network dataset data element.

deNetworkDataset.Directions = networkDirections;

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

IFeatureDatasetExtensionContainer fdxContainer = (IFeatureDatasetExtensionContainer)

featureClass.FeatureDataset;

IFeatureDatasetExtension featureDatasetExtension = fdxContainer.FindExtension

(esriDatasetType.esriDTNetworkDataset);

IDatasetContainer2 datasetContainer2 = (IDatasetContainer2)featureDatasetExtension;

IDEDataset deDataset = (IDEDataset)deNetworkDataset;

INetworkDataset networkDataset = (INetworkDataset)datasetContainer2.CreateDataset

(deDataset);

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

INetworkBuild networkBuild = (INetworkBuild)networkDataset;

networkBuild.BuildNetwork(geoDataset.Extent);

}

catch (Exception ex)

{

//close

}

topic Creating a network dataset programmatically in ArcGIS Network Analyst Questions

Creating a network dataset programmatically