Suppose I have an IEnumerable such as a List(TValue) and I want to keep track of whether this list is being accessed (to prevent issues with, say, adding to the list while it is being iterated over on a different thread); I can always write code such as the following:Suppose I have an IEnumerable such as a List(TV
阅读背景：
有没有办法检查是否正在使用For Each循环访问IEnumerable？
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