using System.Net;public FileStreamResult GetStreaem(string path){var reqFtp = (FtpWebRequest)WebRequest.Create(new Uri(path));reqFtp.Method = WebRequestMethods.Ftp.DownloadFile;reqFtp.UseBinary = true;//reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);reqFtp.UsePassive = false; //選擇主動還是被動模式 , 這句要加上的。reqFtp.KeepAlive = false;//一定要設置此屬性，否則一次性下載多個文件的時候，會出現異常。var response = (FtpWebResponse)reqFtp.GetResponse();var ftpStream = response.GetResponseStream();return File(ftpStream, "application/pdf", "ib70guide.pdf");}