函数:将一根线段Segment转化为Polyline

From: <插件式GIS应用框架的设计与实现>

/// <summary>

        /// 将一根线段segment变成Polyline

        /// </summary>

        /// <param name="iSegment"></param>

        /// <returns></returns>

        private IPolyline getPolylineFromSegment(ISegment iSegment)

        {

            IGeometryCollection pGeoCol = new PolylineClass();

            ISegmentCollection pSegCol = new PathClass();

            ILine pLine = new LineClass();

            pLine.FromPoint = iSegment.FromPoint;

            pLine.ToPoint = iSegment.ToPoint;

            object mis = Type.Missing;

            pSegCol.AddSegment((ISegment)pLine, ref mis, ref mis);

            pGeoCol.AddGeometry((IGeometry)pSegCol,ref mis,ref mis);



            return (IPolyline)pGeoCol;

        }