arcgis 线转面

/// <summary>/// 由线转为面/// </summary>/// <param name="pPolyline"></param>/// <returns></returns>private IPolygon PolyLineToPolygon(IPolyline pPolyline){object obj = Type.Missing;IClone pClonepPolyline = pPolyline as IClone;try{// 闭合线if (pPolyline.IsClosed){ISegmentCollection pPolylineSegment = pClonepPolyline.Clone()as ISegmentCollection;ISegmentCollection pPolygonSegment = new PolygonClass();for (int i = 0; i < pPolylineSegment.SegmentCount; i++){pPolygonSegment.AddSegment(pPolylineSegment.get_Segment(i), ref obj, ref obj);}return pPolygonSegment as IPolygon;}// 非闭合线else{IPointCollection pPolylinePoint = pClonepPolyline.Clone()as IPointCollection;IPointCollection pPolygonPoint = new PolygonClass();for (int i = 0; i < pPolylinePoint.PointCount; i++){pPolygonPoint.AddPoint(pPolylinePoint.get_Point(i), ref obj, ref obj);}IPolygon pPolygon = pPolygonPoint as IPolygon;//pPolygon.Close();return pPolygonPoint as IPolygon;}}catch (Exception exc){Console.WriteLine(exc.Message);return null;}}