topic Re: How to cast a FeatureClass? in ArcObjects SDK Questions

How to cast a FeatureClass?

ShaningYu — Tue, 02 Dec 2014 15:26:54 GMT

I need to cast a featureclass to IPolyline. In this piece of code below

IFeatureClass fcR = gHelp.GetFeatureClass(pWS2, fNameR);

ESRI.ArcGIS.Geometry.IPolyline refLine = fcR as ESRI.ArcGIS.Geometry.IPolyline;

the IPolyline refLine is null. What's wrong in this piece of code? Thanks if you can help.

Re: How to cast a FeatureClass?

ShaningYu — Wed, 03 Dec 2014 12:26:02 GMT

I found my mistake in my post. The correct way is to cast a line feature of a featureclass as an IPolyline:

ESRI.ArcGIS.Geometry.IPolyline pLine = (ESRI.ArcGIS.Geometry.IPolyline)feature.ShapeCopy;

Thanks for your review.

Re: How to cast a FeatureClass?

FreddieGibson — Thu, 25 Jun 2015 22:53:34 GMT

Hi Shuping,

You are correct in your findings. You cannot cast a FeatureClass to IPolyline because a feature class is a collection of polyline. As you discovered, you'd first need to get a feature (IFeature) from the polyline feature class and then you could cast its shape to IPolyline.