创建NetWorkDataset---Shapefile篇

/// <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;

}