/// <summary>
  /// 上传ftp服务
  /// </summary>
  /// <param name="path">文件地址</param>
  /// <returns></returns>
  public string Upload(string path)
  {
   var client = new WebClient();
   client.Credentials = new NetworkCredential("fptuser", "ftppwd");//用户名和密码
   client.BaseAddress = "ftpurl";//ftp地址
   string ftpPath = client.BaseAddress + "/TestFileUpLoad/" + Guid.NewGuid();//上传fptp路径
   string returnPath = "";
   try
   {
    client.UploadFile(ftpPath, path);
    returnPath = ftpPath;
   }
   catch (Exception ex)
   {
    ///错误信息处理
   }
   return returnPath;
  }