IPointCollection转IPolyline

IPointCollection转线IPolyline:

IPolyline pl =  new PolylineClass();

IPointCollection ptc = pl as IPointCollection;

object missing = Type.Missing;

for (int i = 0; i < num1; i++) 
{
          IPoint pt = autoStation.GetFeature(i).Shape as IPoint;//提取点
          ptc.AddPoint(pt, missing, missing);

}

(pl as ITopologicalOperator).Simplify();

//把IPolyline插入到IFeatureClass中

IFeatureClass f1 = (ws as IFeatureWorkspace).OpenFeatureClass("bb1");
IFeature fea=f1.CreateFeature(); 
fea.Shape = pl;
fea.Store();

自己总结一下，省的每次用的时候还得翻箱倒柜。