In my program I've created a custom class 'PtClass' which contains an IPoint named 'Pt' and a collection of 'PtClass' named 'Surround'. This class can be written to and restored from XML.
I read several point features from a featureclass 'FC' with a feature cursor.
For every point feature I create an instance of 'PtClass', use the point feature coordinates to create 'Pt' - to be sure there is no link between the feature and the instance - and store the instance to a collection 'PtCollection'.
When finished, I loop every item in 'PtCollection' to search surrounding point features in 'FC' with a spatial cursor, find the corresponding items in 'PtCollection' and put them in 'Surround'.
Finally this collection is stored to XML.
Then I need some overlapping buffers around certain groups of 'PtClass' points (pointList is a List of 'Pt' from 'PtCollection'):
private IGeometryCollection BufferCollection(List<IPoint> pointList, ISpatialReference spatialReference,
double bufferDistance, bool explodeBuffers, bool unionOverlapBuffers)
IGeometryBag bufferBag = new GeometryBag() as IGeometryBag;
bufferBag.SpatialReference = spatialReference;
IGeometryCollection bufferCollection = bufferBag as IGeometryCollection;
object missing = Type.Missing;
// make a MultiPoint geometry from the collection IPoint's
IMultipoint mp = new Multipoint() as IMultipoint;
mp.SpatialReference = spatialReference;
IGeometryCollection multiPoint = mp as IGeometryCollection;
foreach (IPoint point in pointList)
multiPoint.AddGeometry(point, ref missing, ref missing);
// add the MultiPoint to a geometrybag
IGeometryBag bag = new GeometryBag() as IGeometryBag;
bag.SpatialReference = spatialReference;
IGeometryCollection obstacleBag = bag as IGeometryCollection;
obstacleBag.AddGeometry((IGeometry)multiPoint, ref missing, ref missing);
// create an enumerator
IEnumGeometry enumGeometry = obstacleBag as IEnumGeometry;
// build buffers around the points
IBufferConstruction bufferConstruction = new BufferConstruction();
IBufferConstructionProperties bufferConstructionProperties =
bufferConstructionProperties.ExplodeBuffers = explodeBuffers;
bufferConstructionProperties.UnionOverlappingBuffers = unionOverlapBuffers;
bufferConstruction.ConstructBuffers(enumGeometry, bufferDistance, bufferCollection);
catch (Exception ex)
// do something with the error
But sometimes it returns an empty collection, unless when I start the program anew, skip the 'FC' search and create 'PtCollection' from XML.
All the featurecursors are non-recycling and are released with Marshal.ReleaseComObject immediately afterwards. I'm using Visual Studio 2010 and ArcGIS 10.2.2.
Does it have anything to do with memory usage?