实现对文件读写的操作。利用STL实现对有很好的移植性-realization of the document to read and write operation. The use of STL to achieve a very good transplantation

这个是C#的程序包，包括了读写XML文件，是图书馆借阅系统的界面。-This is a C# package, including reading and writing XML files, library loan system interface.