///
<summary>
///
建立拓扑
///
</summary>
///
<param name="featureDataset">
目标数据集
</param>
///
<param name="topologyName">
拓扑名称
</param>
public void CreateTopology(IFeatureDataset featureDataset, string topologyName)
{ // 建立一个空拓扑（拓扑名称、获得数据集的XY容差作为拓扑容差）
ITopologyContainer topologyContainer = (ITopologyContainer)featureDataset;
ITopology topology = topologyContainer.CreateTopology(topologyName,
topologyContainer.DefaultClusterTolerance, - 1, "");
topologyContainer.DefaultClusterTolerance, - 1, "");
//
获得“Roads”线状要素类加入到拓扑当中，拓扑等级为1
IFeatureClassContainer featureclassContainer = (IFeatureClassContainer)featureDataset;
IFeatureClass featureClass = featureclassContainer.get_ClassByName("Roads");
topology.AddClass(featureClass, 5, 1, 1, false);
//
建立一个拓扑规则（线丌重合）
ItopologyRuleContainer topologyRuleContainer = (ITopologyRuleContainer)topology;
ITopologyRule topologyRule = new TopologyRuleClass();
topologyRule.TopologyRuleType = esriTopologyRuleType.esriTRTLineNoOverlap;
topologyRule.OriginClassID = featureClass.ObjectClassID;
topologyRule.AllOriginSubtypes = true; topologyRule.Name = "Roads No Overlap";
//
把建立好的拓扑规则添加到拓扑中
if (topologyRuleContainer.get_CanAddRule(topologyRule))
{ topologyRuleContainer.AddRule(topologyRule); }
//
验证拓扑 IGeoDataset geoDataset = (IGeoDataset)topology;
//
根据拓扑对象获得范围 IPolygon searchArea = new PolygonClass();
ISegmentCollection segmentCollection = (ISegmentCollection)searchArea;
segmentCollection.SetRectangle(geoDataset.Extent);
//
获得整个拓扑中的“脏区”
IPolygon dirtyArea = topology.get_DirtyArea(searchArea);
//
验证“脏区”
IEnvelope dirtyAreaEnvelope = dirtyArea.Envelope; topology.ValidateTopology(dirtyAreaEnvelope);
