C#Arcengine通过坐标点生成面(环形)

通过传入坐标点，返回几何图形，此代码部分可以生成环形面。 

方法一

        private IGeometry getGeometry(IPointCollection Points)
        {
            IPointCollection iPointCollection = new PolygonClass();

            Ring ring = new RingClass();
            object missing = Type.Missing;

            ring.AddPointCollection(Points);

            IGeometryCollection pointPolygon = new PolygonClass();
            pointPolygon.AddGeometry(ring as IGeometry, ref missing, ref missing);
            IPolygon polyGonGeo = pointPolygon as IPolygon;
            //polyGonGeo.Close();
            polyGonGeo.SimplifyPreserveFromTo();
            return polyGonGeo as IGeometry;

        }

方法二：

        private IGeometry getGeometry1(IPointCollection Points)
        {
            //IPointCollection iPointCollection = new PolygonClass();
            object pMissing = Type.Missing;
             //iPointCollection.AddPointCollection(Points);

            IGeometryCollection pGeoColl = Points as IGeometryCollection;
            ISegmentCollection pRing = new RingClass();
            pRing.AddSegmentCollection(pGeoColl as ISegmentCollection);
            object miss = Type.Missing;
            IGeometryCollection pPolygon = new PolygonClass();
            pPolygon.AddGeometry(pRing as IGeometry, ref miss, ref miss);

            ITopologicalOperator topologicalOperator = pPolygon as ITopologicalOperator;
            topologicalOperator.Simplify();

            return pPolygon as IGeometry;
        }