创建网络数据集

/// <summary>
/// 创建自定义网络数据集
/// </summary>
/// <param name="_pWsName"></param>
/// <param name="_pDatasetName"></param>
/// <param name="_pNetName"></param>
/// <param name="_pFtName"></param>

void CreateNetworkDataset(string _pWsName, string _pDatasetName,string _pNetName, string _pFtName)
{
　　IDENetworkDataset pDENetworkDataset = new DENetworkDatasetClass();
　　pDENetworkDataset.Buildable = true;
　　IWorkspace pWs = GetWorkspace(_pWsName);
　　IFeatureWorkspace pFtWs = pWs as IFeatureWorkspace;
　　IFeatureDataset pFtDataset = pFtWs.OpenFeatureDataset(_pDatasetName);

　　// 定义空间参考,负责会出错
　　IDEGeoDataset pDEGeoDataset = (IDEGeoDataset)pDENetworkDataset;

　　IGeoDataset pGeoDataset = pFtDataset as IGeoDataset;
　　pDEGeoDataset.Extent = pGeoDataset.Extent;
　　pDEGeoDataset.SpatialReference = pGeoDataset.SpatialReference;

　　// 网络数据集的名称
　　IDataElement pDataElement = (IDataElement)pDENetworkDataset;
　　pDataElement.Name = _pNetName;

　　// 参加建立网络数据集的要素类
　　INetworkSource pEdgeNetworkSource = new EdgeFeatureSourceClass();
　　pEdgeNetworkSource.Name = _pFtName;
　　pEdgeNetworkSource.ElementType = esriNetworkElementType.esriNETEdge;

　　// 要素类的连通性
　　IEdgeFeatureSource pEdgeFeatureSource = (IEdgeFeatureSource)pEdgeNetworkSource;
　　pEdgeFeatureSource.UsesSubtypes = false;
　　pEdgeFeatureSource.ClassConnectivityGroup = 1;

　　pEdgeFeatureSource.ClassConnectivityPolicy =esriNetworkEdgeConnectivityPolicy.esriNECPEndVertex;

　　//不用转弯数据
　　pDENetworkDataset.SupportsTurns = false;
　　IArray pSourceArray = new ArrayClass();
　　pSourceArray.Add(pEdgeNetworkSource);
　　pDENetworkDataset.Sources = pSourceArray;

　　//网络数据集的属性设置

　　IArray pAttributeArray = new ArrayClass();

　　// Initialize variables reused when creating attributes:
　　IEvaluatedNetworkAttribute pEvalNetAttr;
　　INetworkAttribute2 pNetAttr2;
　　INetworkFieldEvaluator pNetFieldEval;
　　INetworkConstantEvaluator pNetConstEval;

　　pEvalNetAttr = new EvaluatedNetworkAttributeClass();
　　pNetAttr2 = (INetworkAttribute2)pEvalNetAttr;
　　pNetAttr2.Name ="Meters";
　　pNetAttr2.UsageType = esriNetworkAttributeUsageType.esriNAUTCost;
　　pNetAttr2.DataType = esriNetworkAttributeDataType.esriNADTDouble;
　　pNetAttr2.Units = esriNetworkAttributeUnits.esriNAUMeters;
　　pNetAttr2.UseByDefault = false;

　　pNetFieldEval = new NetworkFieldEvaluatorClass();
　　pNetFieldEval.Setexpression_r("[METERS]", "");
　　//方向设置
　　pEvalNetAttr.set_Evaluator(pEdgeNetworkSource,esriNetworkEdgeDirection.esriNEDAlongDigitized, (INetworkEvaluator)pNetFieldEval);
　　pEvalNetAttr.set_Evaluator(pEdgeNetworkSource,esriNetworkEdgeDirection.esriNEDAgainstDigitized, (INetworkEvaluator)pNetFieldEval);

　　pNetConstEval = new NetworkConstantEvaluatorClass();
　　pNetConstEval.ConstantValue = 0;
　　pEvalNetAttr.set_DefaultEvaluator(esriNetworkElementType.esriNETEdge,(INetworkEvaluator)pNetConstEval);
　　pEvalNetAttr.set_DefaultEvaluator(esriNetworkElementType.esriNETJunction,(INetworkEvaluator)pNetConstEval);
　　pEvalNetAttr.set_DefaultEvaluator(esriNetworkElementType.esriNETTurn,(INetworkEvaluator)pNetConstEval);

　　// 一个网络数据集可以有多个属性，我只添加了一个
　　pAttributeArray.Add(pEvalNetAttr);
　　pDENetworkDataset.Attributes = pAttributeArray;

　　// 创建网络数据集，注意在创建几何网络的时候会锁定相应的要素类，因此不要用ArcMap或者catalog等打开参相应的数据
　　INetworkDataset pNetworkDataset = Create(pFtDataset, pDENetworkDataset);

　　//建立网络
　　INetworkBuild pNetworkBuild = (INetworkBuild)pNetworkDataset;
　　pNetworkBuild.BuildNetwork(pGeoDataset.Extent);
}

/// <summary>
/// 创建无向网络
/// </summary>
/// <param name="_pFeatureDataset"></param>
/// <param name="_pDENetDataset"></param>
/// <returns></returns>
public INetworkDataset Create(IFeatureDataset _pFeatureDataset, IDENetworkDataset2  _pDENetDataset)
{
      IFeatureDatasetExtensionContainer pFeatureDatasetExtensionContainer = (IFeatureDatasetExtensionContainer) _pFeatureDataset;
      IFeatureDatasetExtension pFeatureDatasetExtension = pFeatureDatasetExtensionContainer.FindExtension (esriDatasetType.esriDTNetworkDataset);
      IDatasetContainer2 pDatasetContainer2 = (IDatasetContainer2)pFeatureDatasetExtension;
      IDEDataset pDENetDataset = (IDEDataset)_pDENetDataset;
      INetworkDataset pNetworkDataset = (INetworkDataset)pDatasetContainer2.CreateDataset(pDENetDataset);
　  return pNetworkDataset

}