用C#编写，实现在日历里添加记事功能，使用文件操作，减去了使用数据库的繁琐。而且简单易懂，注释详细，方便修改。适于初学者参照研究。-Written in C# to achieve to add notes in the calendar, file operations, less cumbersome to use the database. And easy-to-understand, detailed annotations, easy to modify. Suitable for