获取环状要素的外环点、内环点

问题描述：如题

解决方法：

IGeometryCollection polyline = feature.Shape as IGeometryCollection;//获取几何集
IPointCollection pc = polyline.Geometry[0] as IPointCollection;//第一个环（外环）点集
IPointCollection pc = polyline.Geometry[1] as IPointCollection;//第一个环（外环）点集
......


double polygonLength = (feature.Shape as IPolygon).Length;//环状要素周长。指的是外环周长+内环周长

转载自：https://blog.csdn.net/qq_33222460/article/details/86480753