求助：关于利用c#修改ftp文件名问题

我在win7系统下运行我写的c#服务，通过服务给linux的ftp传文件，传输成功后修改ftp目录下文件名，但是win7 32位系统下可以正常重命名，但是到win7 64位系统下，linux监测文件改名时，修改的名字前会有一个多余的“/”，但是ftp下重命名的文件不会有多余的“/”，求助大神为什么会出现这个“/”，附上代码

bool isSuccess = ftpHelper.fileUpload(file, ftpSource.FilePath, fileNewName);
                            if (isSuccess)
                            {
                                DataTable svrDataTable = ServerCom.ExeSqlForDataTable("select * from totalstream where isupload=0");
                                long sum = 0;
                                string fileName = string.Empty;
                                foreach (DataRow row in svrDataTable.Rows)
                                {
                                    if (row["FileZipName"].ToString() == file.Name.ToString())
                                    {
                                        fileName = row["FileName"].ToString();
                                        sum = Convert.ToInt64(row["StreamNum"]);
                                        break;
                                    }
                                }
                                DateTime time = DateTime.Now;
                                ftpHelper.fileRename(ftpSource.FilePath, fileNewName, fileName.Replace("txt", "zip"));
                                file.CopyTo(file.DirectoryName + "/" + fileName.Replace("txt", "zip"));
                                file.Delete();
                                                                }

 /// <summary>
        /// 重命名
        /// </summary>
        /// <param name="ftpPath">ftp文件路径</param>
        /// <param name="currentFilename"></param>
        /// <param name="newFilename"></param>
        public bool fileRename(string ftpPath, string currentFileName, string newFileName)
        {
            bool success = false;
            FtpWebRequest ftpWebRequest = null;
            FtpWebResponse ftpWebResponse = null;
            Stream ftpResponseStream = null;
            try
            {
                string uri = ftpRootURL + ftpPath + currentFileName;
                ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
                ftpWebRequest.Credentials = new NetworkCredential(ftpUser, ftpPassword);
                ftpWebRequest.UseBinary = true;
                ftpWebRequest.Method = WebRequestMethods.Ftp.Rename;
                ftpWebRequest.RenameTo = newFileName;

                ftpWebResponse = (FtpWebResponse)ftpWebRequest.GetResponse();
                ftpResponseStream = ftpWebResponse.GetResponseStream();

            }
            catch (Exception)
            {
                success = false;
            }
            finally
            {
                if (ftpResponseStream != null)
                {
                    ftpResponseStream.Close();
                }
                if (ftpWebResponse != null)
                {
                    ftpWebResponse.Close();
                }
            }
            return success;
        }                                                               

目前在win10上可正常传输，win7、winserver都不行

既然如此
file.CopyTo(file.DirectoryName + "/" + fileName.Replace("txt", "zip"));
修改为
if (fileName.Replace("txt", "zip").StartsWith(""/))
file.CopyTo(file.DirectoryName + fileName.Replace("txt", "zip"));
else
file.CopyTo(file.DirectoryName + "/" + fileName.Replace("txt", "zip"));

友情提示一下，linux服务器默认的开启的是sftp服务，如果你这个需要上生产的话，最好是能切到sftp服务上去传文件