GC.Collect() not collecting immediately?

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Objects with finalizers cannot be collected within a single garbage collection procedure. Such objects are moved to f-reachable queue, and remain there until finalizers are called. Only after that they can be garbage-collected.

Following code is better, but you should not rely on it anyway:

GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();

Also, throwing exceptions in finalizer seems too brutal for me, even for testing purposes.

Also, interesting side-effect of finalizers: an object with finalizer can still ‘resurrect’ itself (effectively prevent garbage collection of itself), if stores this reference in finalizer (assigns it to some static variable).

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