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项目中遇到需要将面转成线，网上的大多资料都是使用GP工具，对整个图层进行面转线，这里的方法可以对单个要素进行面转线操作。代码如下：

 IPolygon polygon = pFeature.Shape as IPolygon;
 ISegmentCollection segmentCollction = polygon as ISegmentCollection;
 ISegmentCollection polyline = new Polyline() as ISegmentCollection;
 object missing = Type.Missing;
 for (int m = 0; m < segmentCollction.SegmentCount; m++)
    {
    ISegment pSeg = segmentCollction.get_Segment(m);
    polyline.AddSegment(pSeg, ref missing, ref missing);
    }
  IGeometry pGeo = polyline as IPolyline;
  IFeature pInFeatureLine = pFeatureClass.CreateFeature();//线图层创建的要素
  pInFeatureLine .Shape = pGeo ;