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copied!<p>I had this same problem, and solved it like this (WeakDictionary is the class I was trying to clean up):</p> <pre><code>internal class CleanerRef { ~CleanerRef() { if (handle.IsAllocated) handle.Free(); } public CleanerRef(WeakDictionaryCleaner cleaner, WeakDictionary dictionary) { handle = GCHandle.Alloc(cleaner, GCHandleType.WeakTrackResurrection); Dictionary = dictionary; } public bool IsAlive { get {return handle.IsAllocated && handle.Target != null;} } public object Target { get {return IsAlive ? handle.Target : null;} } GCHandle handle; public WeakDictionary Dictionary; } internal class WeakDictionaryCleaner { public WeakDictionaryCleaner(WeakDictionary dict) { refs.Add(new CleanerRef(this, dict)); } ~WeakDictionaryCleaner() { foreach(var cleanerRef in refs) { if (cleanerRef.Target == this) { cleanerRef.Dictionary.ClearGcedEntries(); refs.Remove(cleanerRef); break; } } } private static readonly List<CleanerRef> refs = new List<CleanerRef>(); } </code></pre> <p>What this two classes try to achieve is to "hook" the GC. You activate this mechanism by creating an instance of WeakDictionaryCleaner during the construction of the weak collection:</p> <pre><code>new WeakDictionaryCleaner(weakDictionary); </code></pre> <p>Notice that I don't create any reference to the new instance, so that the GC will dispose it during the next cycle. In the ClearGcedEntries() method I create a new instance again, so that each GC cycle will have a cleaner to finalize that in turn will execute the collection compaction. You can make the CleanerRef.Dictionary also a weak reference so that it won't hold the dictionary in memory.</p> <p>Hope this helps</p>

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