///

 

<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, 

""); 

//

 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);