c#实现p2p文件共享，①、按P2P原理规划一文件共享程序；

②、支持文件检索；

③、支持客户端间点对点直接文件传输；

④、支持文件共享信息维护（添加、删除、修改）；

⑤、支持服务端之间的共享信息交互；-c# achieve p2p file sharing, ①, according P2P principle planning a file-sharing program　②, support document retrieval　③, support for direct file transfer between peer clients　④, supports file sharing of information maintenance (add, delete, modify)　⑤ support the sharing of information between the service side of the interaction