I have a polyline feature class with several closed lines (the start point = the end point). I need to break these lines in two features, using ArcObjects (doesn't matter Java, VB or C#).

I have already detected these closed lines in this way:

IFeatureCursor featureCursor = lineFeatureClass.search(null, false);
        IFeature feature = null;
        while((feature = featureCursor.nextFeature()) != null) {
            IGeometry geometry = feature.getShape();
            IPolyline polyline = (IPolyline)geometry;
            if(polyline.isClosed()) {
                log.info("closed line detected");
                boolean[] splitHappened = new boolean[1];
                int[] newPartIndex = new int[1];
                int[] newSegmentIndex = new int[1];
                polyline.splitAtDistance(0.5, true, true, splitHappened, newPartIndex, newSegmentIndex);


Now, I get a polyline composed of 2 parts (or path), and I don't know how to get them.

Then, I need to remove the second path from the current feature, and create a new feature with the second path as a geometry and the same attribute values.

Does anyone know what's the best way to do that?

  • Not sure if this will help you, but there are geoprocessing tools you can call in ArcObjects to seperate multipart features into individual features: (resources.arcgis.com/en/help/main/10.1/index.html#//…)
    – pvdev
    Commented Nov 18, 2014 at 9:35
  • yes, maybe it's a good way to split polylines as multipart, and then to get singleparts with the geoprocessing tool. Nevertheless, I would prefer not to create a new feature class.
    – superrache
    Commented Nov 18, 2014 at 9:45

1 Answer 1


polyline.splitAtDistance doesn't actually split a polyline. All you have to do is cast your IFeature as IFeatureEdit and use the method IFeatureEdit.Split(). This will create two separate features.

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