Memory Leak on referencing IMap instance

Question

var pMd = new MapDocumentClass();
pMd.Open(RevisionState.CurrentBackupMXDPath_.BSValue());
var pMap = pMd.Map[0];
pMd.Close();
Marshal.FinalReleaseComObject(pMap);
pMap = null;
Marshal.FinalReleaseComObject(pMd);
pMd = null;
GC.Collect();
GC.WaitForPendingFinalizers();

Please see the code above. I found that memory usage increased so much while executing var pMap = pMd.Map[0];. However, I cannot release these memory even I run all the rest of the statement. May I know how can I release IMap reference? Thanks!

Hornbydd · Answer

What is in the map? Do you have basemaps displaying, layers linking to say datasets stored in ArcGIS Online or ArcServer that maybe maintaining a link thus not allowing memory to be released? I would try a simple map with say a locally stored shapefile as  a test. See if you can track the problem down.

mannokmannok · Answer

This is because you are playing with a short-run process. For me, I am working with a long run process which lives as long as the lifetime of an ArcMap session.

BrentHoskisson · Answer

At the very end of all of my projects in "Dispose" of my form with the map I always include

ESRI.ArcGIS.ADF.COMSupport.AOUninitialize.Shutdown();

This is in the ESRI.ArcGIS.ADF.Local resource.

I have never had an issue and I don't need to do the garbage collecting and marshalling.

Brent Hoskisson