c# arcgis IRing与Ipolygon转换

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       public static IGeometry  CreatePolygonfromRing(IRing ExRing)

         {

             ISegmentCollection  SegCol= ExRing as ISegmentCollection;

             IPolygon  PPolygon =new PolygonClass();

              ISegmentCollection newSegCol = PPolygon as ISegmentCollection;

             newSegCol.AddSegmentCollection(SegCol);

             return PPolygon as IGeometry;

         }