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The MemoryCache class in .net is supposed to evict items whenever the amount of memory it uses exceeds some limit.
How does it actually determine how much memory its items are using?
MemoryCachehas an internalCacheMemoryMonitorthat periodically asks its references how big they are. It utilizes an internal type in mscorlib calledSizedReferencewhich is a reference that also keeps track of how much memory (approximately) its target uses.It also collects various statistics from the GC to help ascertain if memory pressure should cause it to start an eviction process.