摘要：
https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/concepts/linq/basic-queries-linq-to-xml In This Section TopicDescription How to: Find 阅读全文
摘要：
https://stackoverflow.com/questions/36019544/if-double-slash-is-used-2-times-in-xpath-what-does-it-mean Double slash // means any descendant node of t 阅读全文