在C＃中使用弱引用的GC成本？

Question

In another question , Stephen C says:

A second concern is that there are runtime overheads with using weak references. The obvious costs are those of creating weak references and calling get on them. A less obvious cost is that significant extra work needs to be done each time the GC runs.

So what exactly is the cost to the GC of a weak ref? What extra work does it need to do, and how big of a deal is it? I can make some educated guesses, but am interested in the actual mechanics.

Answer 1

请查看Jeffrey Richter关于.NET中的内存管理的文章，它必须稍微澄清一下。