C#编写一个查询程序，用于查询IP所属城市和手机号码归属地，在Bin目录中，已备好测试数据，IPData.dat为IP数据文件，MPhoneData.dat为手机号码归属地数据文件，程序的实现也是很简单的，只是一些数据库的查询操作，在查询前，判断了数据文件是否不存在，如果不存在则弹出提示。注：测试里面的数据只是测试用，可能并不太准确，而且不太全面，你需要自己收集完整的IP和号码数据。-C# write a query procedures, used to query IP respective cities and phone number attribution, in the Bin directory, the test data have been ready, IPData.dat to IP data files, MPhoneData.dat for the phone number belonging to a data file, the program' s implementation is very simple, just some database queries, the query before the judge whether the data file does not exist, does not exist if prompted. Note: The test data inside just testing, it may not quite accurate, but less comprehensive, you need to own the complete collection of IP and number data.