Upload Multiple files to FTP in c#

问题:

i'm using the below method to upload files from local server to FTP server, here i'm creating a new connection and initiating a new session each and every file uploading and closing the same. how to achieve this in single initiated session in c#.

this is my code

public bool UploadTempFilesToFTP()
    {
        string[] fileList;
        try
        {
            ConfiguredValues conObj = new ConfiguredValues();
            conObj.PickTheValuesFromConfigFile();
            fileList = Directory.GetFiles(conObj.tempPath);
            foreach (string FileName in fileList)
            {
                FtpWebRequest upldrequest = (FtpWebRequest)FtpWebRequest.Create(conObj.tempOutboundURL + FileName);


                upldrequest.UseBinary = true;
                upldrequest.KeepAlive = false;
                upldrequest.Timeout = -1;
                upldrequest.UsePassive = true;

                upldrequest.Credentials = new NetworkCredential(conObj.user, conObj.pass);

                upldrequest.Method = WebRequestMethods.Ftp.UploadFile;

                string destinationAddress = conObj.tempPath;

                FileStream fs = File.OpenRead(destinationAddress + FileName);
                byte[] buffer = new byte[fs.Length];
                fs.Read(buffer, 0, buffer.Length);
                fs.Close();
                Stream requestStr = upldrequest.GetRequestStream();
                requestStr.Write(buffer, 0, buffer.Length);
                requestStr.Close();
                requestStr.Flush();
                FtpWebResponse response = (FtpWebResponse)upldrequest.GetResponse();
                response.Close();
                File.Delete(destinationAddress + FileName);
            }
            Console.WriteLine("Uploaded Successfully to Temp folder");
            return true;
        }
        catch (Exception ex)
        {
            Console.WriteLine("Upload failed. {0}", ex.Message);
            return false;
        }

    } 

回答1:

The ftp protocol is intended to works on request basis.

You start a request with a method (in your case UploadFile).

The only thing you can do is to KeepAlive your request to avoid connection closing

upldrequest.KeepAlive = true;

on every request you create except the last one. This will make a login only the first FTPWebRequest.

Then when you create the last FTPWebRequest, set

upldrequest.KeepAlive = false;

and it will close the connection when done.