c# ftp上传下载

上传到ftp

private void Upload(string filename)

{

    FileInfo fileInf = new FileInfo(filename);

    string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;

    FtpWebRequest reqFTP; 

    // Create FtpWebRequest object from the Uri provided

    reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileInf.Name)); 

    // Provide the WebPermission Credintials

    reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); 

    // By default KeepAlive is true, where the control connection is not closed

    // after a command is executed.

    reqFTP.KeepAlive = false; 

    // Specify the command to be executed.

    reqFTP.Method = WebRequestMethods.Ftp.UploadFile; 

    // Specify the data transfer type.

    reqFTP.UseBinary = true; 

    // Notify the server about the size of the uploaded file

    reqFTP.ContentLength = fileInf.Length; 

    // The buffer size is set to 2kb

    int buffLength = 2048;

    byte[] buff = new byte[buffLength];

    int contentLen; 

    // Opens a file stream (System.IO.FileStream) to read the file to be uploaded

    FileStream fs = fileInf.OpenRead(); 

    try

    {

        // Stream to which the file to be upload is written

        Stream strm = reqFTP.GetRequestStream(); 

        // Read from the file stream 2kb at a time

        contentLen = fs.Read(buff, 0, buffLength); 

        // Till Stream content ends

        while (contentLen != 0)

        {

            // Write Content from the file stream to the FTP Upload Stream

            strm.Write(buff, 0, contentLen);

            contentLen = fs.Read(buff, 0, buffLength);

        } 

        // Close the file stream and the Request Stream

        strm.Close();

        fs.Close();

    }

    catch (Exception ex)

    {

        MessageBox.Show(ex.Message, "Upload Error");

    }

}

 

下载

private void Download(string filePath, string fileName)

{

    FtpWebRequest reqFTP;

    try

    {

        //filePath = <<The full path where the file is to be created. the>>,

        //fileName = <<Name of the file to be createdNeed not name on FTP server. name name()>>

        FileStream outputStream = new FileStream(filePath + "//" + fileName, FileMode.Create); 

        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileName));

        reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

        reqFTP.UseBinary = true;

        reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

        FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

        Stream ftpStream = response.GetResponseStream();

        long cl = response.ContentLength;

        int bufferSize = 2048;

        int readCount;

        byte[] buffer = new byte[bufferSize];

        readCount = ftpStream.Read(buffer, 0, bufferSize);

        while (readCount > 0)

        {

            outputStream.Write(buffer, 0, readCount);

            readCount = ftpStream.Read(buffer, 0, bufferSize);

        }

        ftpStream.Close();

        outputStream.Close();

        response.Close();

    }

    catch (Exception ex)

    {

        MessageBox.Show(ex.Message);

    }

}