说明：  用C#实现基于WEBService的文件传输程序，Web服务的创建和调用，并WSE3.0、后台线程的创建模式、文件哈希校验等
(To use C# to achieve WEBService-based file transfer program, Web services, to create and call, and WSE3.0, background thread creation mode, the file hash check, etc.)