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IFeatureCursor.NextFeature not releasing memory

ElmorFigio

I've got a non recycling cursor retrieving features into a `List<IFeature>`.

When I populate the list, I can see my memory usage climbing up. When I discard my list (or it goes out of scope), the memory doesn't go down again, even when explicitly calling the garbage collector.

I've tried looping through the list and calling ReleaseComObject on each IFeature, also to no avail.

This is an issue, as my app does this whenever a given user action is performed, and the memory usage just keeps climbing, till there's no memory left on the machine and it crashes.

This is driving me nuts. Any ideas?

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Accepted answers

ElmorFigio

This topic was addressed and resolved over at http://gis.stackexchange.com/questions/1133/ifeaturecursor-nextfeature-not-releasing-memory

Thanks for our help though McCancey

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JanDuske

I've just made a test on this issue. This simple function is called in an inifite loop:

        
private static void check(IFeatureWorkspace fws)
        {
            IFeatureCursor c = fws.OpenFeatureClass("XYZ").Search(null, false);
            IFeature f = c.NextFeature();
            m_List = null;
            GC.Collect(2);
            m_List = new List<IFeature>();
            while (f != null)
            {
                m_List.Add(f);
                f = c.NextFeature();
            }
            Marshal.FinalReleaseComObject(c);
        }

Each time the function is called the memory usage drops to approximately the size it had before the last cursor loop, maybe a few KB more.
Can you post you critical code? Are you sure that there's no other operation involved which might increase memory usage, like in a ClassExtension fireing for each user action?

ElmorFigio

This topic was addressed and resolved over at http://gis.stackexchange.com/questions/1133/ifeaturecursor-nextfeature-not-releasing-memory

Thanks for our help though McCancey

DonnyVelazquez

For anyone having this issue in 10.4.1. Looks like its a bug in ArcObjects. Doesn't get fixed until 10.5.1.

arcobjects - IFeatureCursor.NextFeature not releasing memory - Geographic Information Systems Stack Exchange

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