The number of points is less than required for feature

IPolygon polygon = new PolygonClass();IPointCollection pointCollection = (IPointCollection)polygon;

添加大于三个点到 pointCollection 中，由于第一个点和最后一个点不一样，运行时出现错误“The number of points is less than required for feature”。

解决方案：

//执行如下代码，简化多边形//Simplifies the polygon and maintains the index location of the from/to point of each ringpolygon.SimplifyPreserveFromTo();