根据给定的弧段 ID 数组查找与这些弧段相连通的环路，返回构成环路的弧段 ID 数组。
命名空间：
SuperMap.Analyst.NetworkAnalyst程序集： SuperMap.Analyst.NetworkAnalyst (in SuperMap.Analyst.NetworkAnalyst)
版本: dll
语法
| C# |
|---|
public int[] FindLoopsFromEdges( int[] edgeIDs ) |
参数
- edgeIDs
- Type: array<
System..::.Int32
>[]()[]
指定的弧段 ID 数组。
返回值
与给定弧段相连通的环路的弧段 ID 数组。备注
设施网络中，两条或两条以上流向值为 2（即不确定流向）的弧段构成的闭合路径，称为环路。详细内容请参阅 CheckLoops 方法的介绍。
示例
以下代码示范了如何查找与给定的弧段或结点相连通的环路。
假设下面函数操作的网络数据集为安装目录\SampleData\changchun\下的 changchun.udb 数据源中的名为 RoadNet 的网络数据集，并且已经为该网络数据集建立了流向以及等级。有关建立网络数据集的流向及等级，请参见 NetworkBuilder.BuildFacilityNetworkDirections 方法。
CopyC#public void FindLoopsFrom(DatasetVector networkDataset) { //设置用于设施网络分析的环境 FacilityAnalystSetting facilityAnalystSetting = new FacilityAnalystSetting(); facilityAnalystSetting.NetworkDataset = networkDataset; facilityAnalystSetting.DirectionField = "Direction"; facilityAnalystSetting.EdgeIDField = "SmID"; facilityAnalystSetting.NodeIDField = "SmNodeID"; facilityAnalystSetting.FNodeIDField = "SmFNode"; facilityAnalystSetting.TNodeIDField = "SmTNode"; facilityAnalystSetting.Tolerance = 0.0015; WeightFieldInfo weightFieldInfo = new WeightFieldInfo(); weightFieldInfo.Name = "Length"; weightFieldInfo.FTWeightField = "SmLength"; weightFieldInfo.TFWeightField = "SmLength"; WeightFieldInfos weightFieldInfos = new WeightFieldInfos(); weightFieldInfos.Add(weightFieldInfo); facilityAnalystSetting.WeightFieldInfos = weightFieldInfos; FacilityAnalyst facilityAnalyst = new FacilityAnalyst(); facilityAnalyst.AnalystSetting = facilityAnalystSetting; facilityAnalyst.Load(); //获取参与分析的弧段或结点 Int32[] edgeIDs = new Int32[] { 3855, 9073 }; Int32[] nodeIDs = new Int32[] { 2996, 2682 }; //查找与给定弧段相连通的环路 Int32[] loopsFromEdges = facilityAnalyst.FindLoopsFromEdges(edgeIDs); //查找与给定结点相连通的环路 Int32[] loopsFromNodes = facilityAnalyst.FindLoopsFromNodes(nodeIDs); }
