IPointCollection转IPolyline

IPointCollection转线IPolyline:

 IPolyline pl =  new PolylineClass();

 IPointCollection ptc = pl as IPointCollection;

 object missing = Type.Missing;

 for (int i = ; 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。