#region  文件上上传

        /// <summary>
        /// 文件上上传
        /// </summary>
        /// <param name="fileinfo"></param>源文件路径
        /// <param name="targetDir"></param>目标目录
        /// <param name="hostname"></param> 主机名
        /// <param name="username"></param> 用户名
        /// <param name="password"></param> 密码
        /// 

        public  void UploadFile(FileInfo fileinfo, string targetDir, string hostname, string username, string password)
        {
            //1. check target
            string target;
            if (targetDir.Trim() == "")
            {
                return;
            }
            target = Guid.NewGuid().ToString();  

            string URI =hostname + targetDir + target;
            ///WebClient webcl = new WebClient();

            System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);

            //设置FTP命令
            ftp.Method = System.Net.WebRequestMethods.Ftp.UploadFile;
            ftp.UseBinary = true;
            ftp.UsePassive = true;

            //告诉ftp文件大小
            ftp.ContentLength = fileinfo.Length;

            const int BufferSize = 4096 * 4096;
            byte[] content = new byte[BufferSize - 1 + 1];
            int dataRead;

            //上传文件内容
            using (FileStream fs = fileinfo.OpenRead())
            {
                try
                {
                    using (Stream rs = ftp.GetRequestStream())
                    {
                        do
                        {
                            dataRead = fs.Read(content, 0, BufferSize);
                            rs.Write(content, 0, dataRead);
                        } while (!(dataRead < BufferSize));
                        rs.Close();
                        WriteLog("upload sucess!");

                        txt_log.Text = "\r\n\n" + DateTime.Now.ToString() + ": " + "upload sucess!\r\n\n" + txt_log.Text;

                    }
                }
                catch (Exception ex)
                {
                    WriteLog(ex.Message);
                    txt_log.Text = "\r\n\n" + DateTime.Now.ToString() + ": 异常警告：" + ex.Message + "\r\n\n" + txt_log.Text;

                }
                finally
                {
                    fs.Close();
                }
            }

            ftp = null;

            //设置FTP命令
            ftp = GetRequest(URI, username, password);
            ftp.Method = System.Net.WebRequestMethods.Ftp.Rename; //改名
            ftp.RenameTo = fileinfo.Name;
            try
            {
                ftp.GetResponse();
            }
            catch (Exception ex)
            {
                ftp = GetRequest(URI, username, password);
                // ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile; //删除
                ftp.GetResponse();
                WriteLog(ex.Message);
                WriteLog(ex.Message);
                txt_log.Text = "\r\n\n" + DateTime.Now.ToString() + ": "+ ex.Message + "\r\n\n" + txt_log.Text;

            }
            finally
            {
                fileinfo.Delete();//删除原件
                // WriteLog("file delete!");
            }
            ftp = null;
        }

       
         private static FtpWebRequest GetRequest(string URI, string username, string password)
        {
            FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);
            result.Credentials = new System.Net.NetworkCredential(username, password);
            result.KeepAlive = false;
            return result;
        }


        #endregion