topic Re: IFeatureCursor.NextFeature not releasing memory in ArcObjects SDK Questions

IFeatureCursor.NextFeature not releasing memory

ElmorFigio — Fri, 13 Aug 2010 03:29:18 GMT

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?

Re: IFeatureCursor.NextFeature not releasing memory

JanDuske — Sat, 11 Dec 2021 19:08:22 GMT

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?

Re: IFeatureCursor.NextFeature not releasing memory

ElmorFigio — Tue, 17 Aug 2010 01:01:00 GMT

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

Re: IFeatureCursor.NextFeature not releasing memory

DonnyVelazquez — Wed, 04 Oct 2017 15:38:25 GMT

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

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