插件式开发Demo

代码说明：

说明：  热插拔式应用，winform框架，核心代码，只需要单独开发子系统以dll文件的形式从前台引入即可，供学习用(Hot plug-in applications, WinForm framework, core code, just need to develop a separate subsystem in the form of DLL files from the front desk can be introduced for learning.)