学步园

        {
            try
            {
                ISegmentCollection ipSegColl;
                IPolygon ipPolygon = new PolygonClass();

                IGeometryCollection ipPolylineToPolygon = new PolygonClass();
                IClone ipClone1, ipClone2;
                ipClone1 = ipPline as IClone;

                ipClone2 = ipClone1.Clone();
                IGeometryCollection ipGeosPolyline = ipClone2 as IGeometryCollection;
                int iCount = ipGeosPolyline.GeometryCount;

                object before = Type.Missing;
                object after = Type.Missing;
                for (int i = 0; i < iCount; i++)
                {
                    IGeometry ipSRing;
                    ipSegColl = new RingClass();
                    ipSRing = ipGeosPolyline.get_Geometry(i);

                    ipSegColl.AddSegmentCollection(ipSRing as ISegmentCollection);
                    IRing ring = ipSegColl as IRing;
                    IGeometry geo = ring;
                    ipPolylineToPolygon.AddGeometry(geo, ref before, ref after);

                    Marshal.ReleaseComObject(ipSRing);
                    Marshal.ReleaseComObject(ring);
                    Marshal.ReleaseComObject(geo);

                }
                ipPolygon = ipPolylineToPolygon as IPolygon;
                ipPolygon.SimplifyPreserveFromTo();

                //Marshal.ReleaseComObject(ipPolylineToPolygon);
                Marshal.ReleaseComObject(ipClone1);
                Marshal.ReleaseComObject(ipClone2);
                Marshal.ReleaseComObject(ipGeosPolyline);
                return ipPolygon;
            }
            catch (Exception ee)
            {
                MessageBoxEx.Show(ee.Message);
                return null;
            }
        }