Question

arcengine 中怎么把IFeatureLayer或者IFeatureClass转成IGeometry类型

arcengine 中怎么把IFeatureLayer或者IFeatureClass转成IGeometry类型，我的目的是用一个polyline叠置查询一个线图层里面的线。用到ITopologicalOperator的Intersect方法。有朋友知道怎么实现吗？谢谢了~（最好用C#语言）

Answer 1

可以不用ITopologicalOperator，直接用空间查询就可以实现
//spatial query
ISpatialFilter pSpatialFilter = new SpatialFilterClass();
pSpatialFilter.Geometry = (IGeometry)pPolyline;//用于查询的polyline
SpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;//Intersect
IFeatureCursor pFeatureCursor = pFeatureClass.Search(pSpatialFilter, false);//query
IFeature pFeature = pFeatureCursor.NextFeature();
while (pFeature != null)
{
IPolyline pQueryPolyline = (IPolyline)pFeature.Shape ; //查询出来的polyline
pFeature = pFeatureCursor.NextFeature();
}
//release com resource
System.Runtime.InteropServices.Marshal.ReleaseComObject(pFeatureCursor);

追问

这个可以用，但可能会找出交叉但不重合的线，我在循环里加了叠置分析，再用线长判断就可以找出了，可能方法有点笨拙，不知道有没有好方法~(*^__^*) 嘻嘻……~
pTopo = pPolyline as ITopologicalOperator;
pBuffer = pTopo.Intersect(pQueryPolyline, esriGeometryDimension.esriGeometry1Dimension);pPolylineResult = pBuffer as IPolyline;if (pPolylineResult.Length != 0.0){i++;}

追答

那你可以试试IRelationalOperator里面的Overlaps 方法，可能有用