获取离点最近的线要素

输入点要素feature和   和   线要素的集合IFeatureClass  ，返回一个feature_line。

 public IFeature get_nearst_feature(IFeature feature_point,IFeatureClass featureclass_line)
        {
            _point = feature_point.Shape as IPoint;
            IFeatureIndex2 pFeatureIndex = new FeatureIndexClass();
            pFeatureIndex.FeatureClass = featureclass_line;//这里应该是要查询的线要素类 
            ITrackCancel trackCancel = new TrackCancelClass();
            pFeatureIndex.Index(trackCancel, (featureclass_line as IGeoDataset).Extent);
            IIndexQuery2 pIndexQuery2 = (IIndexQuery2)pFeatureIndex;
            int pClosestFeatureFID;
            double pDistance;
            pIndexQuery2.NearestFeature(feature_point.Shape, out pClosestFeatureFID, out pDistance);//输入点 进行遍历

            if (pClosestFeatureFID < 0)
            {
                return null;
            }

            IFeature feature_line = featureclass_line.GetFeature(pClosestFeatureFID);
            return feature_line;


        }

转载自：https://blog.csdn.net/qq_33222460/article/details/79639015