Stream rs;
        public bool Upload(FileInfo localFile, string remoteFileName)
        {
            try
            {
                bool result = false;
                if (localFile.Exists)//判定
                {
                    string url = Host.TrimEnd('/') + RemotePath + remoteFileName;
                    FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.UploadFile);
                    //上传数据
                    Stream rs = request.GetRequestStream();
                    using (FileStream fs = localFile.OpenRead())
                    {

                        byte[] buffer = new byte[4096];//4K
                        int count = fs.Read(buffer, 0, buffer.Length);
                        while (count > 0)
                        {
                            rs.Write(buffer, 0, count);
                            count = fs.Read(buffer, 0, buffer.Length);

                        }
                        fs.Close();
                        result = true;
                    }
                    return result;
                }
            }
            catch (Exception ex)
            {
               
            }
            throw new Exception(string.Format("本地文件不存在,文件路径:{0}", localFile.FullName));
        }
        #endregion