FTP操作帮助类: public class FtpState { private ManualResetEvent wait; private FtpWebRequest request; private string fileName; private Exception operationException = null; string status; public FtpState() { wait = new ManualResetEvent(false); } public ManualResetEvent OperationComplete { get { return wait; } } public FtpWebRequest Request { get { return request; } set { request = value; } } public string FileName { get { return fileName; } set { fileName = value; } } public Exception...