这类技巧可以用来建立索引，或将目录树状结构内容的索引反转。

This type of technique could be used to create indexes or reverse indexes of the contents of a directory tree.

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这个范例显示如何查询所指定目录树状结构中的所有档案、开启每个档案，然后检查档案的内容。

This example shows how to query over all the files in a specified directory tree, open each file, and inspect its contents.

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这个作法在逐一查看大型目录树状结构时比较快，尽管处理时间相较于第一个范例可能会根据许多因素而不同。

This approach can be faster when you are iterating over large directory trees, although the processing time compared to the first example can depend on many factors.

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