Upload and download FTP server files using C#/.NET

This article describes how to use C#/.NET to efficiently upload and download FTP server files. We'll provide several methods, including using WebClient and FtpWebRequest, and show how to track upload and download progress.

File upload

Method 1: Use WebClient (simple method)

Here’s the easy way to upload your files:

WebClient client = new WebClient();
client.Credentials = new NetworkCredential("用戶名", "密碼");
client.UploadFile("ftp://ftp.example.com/遠(yuǎn)程路徑/文件.zip", @"C:\本地路徑\文件.zip");

Method 2: Use FtpWebRequest (stream copy, more fine control)

This method allows finer control over the upload process, achieved via stream replication:

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/遠(yuǎn)程路徑/文件.zip");
request.Credentials = new NetworkCredential("用戶名", "密碼");
request.Method = WebRequestMethods.Ftp.UploadFile;

using (Stream fileStream = File.OpenRead(@"C:\本地路徑\文件.zip"))
using (Stream ftpStream = request.GetRequestStream())
{
    fileStream.CopyTo(ftpStream);
}

Method 3: Use FtpWebRequest (blocked copy, progress tracking)

This method copies the file content in chunks to track the upload progress:

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/遠(yuǎn)程路徑/文件.zip");
request.Credentials = new NetworkCredential("用戶名", "密碼");
request.Method = WebRequestMethods.Ftp.UploadFile;

using (Stream fileStream = File.OpenRead(@"C:\本地路徑\文件.zip"))
using (Stream ftpStream = request.GetRequestStream())
{
    byte[] buffer = new byte[10240];
    int read;
    while ((read = fileStream.Read(buffer, 0, buffer.Length)) > 0)
    {
        ftpStream.Write(buffer, 0, read);
        Console.WriteLine("已上傳 {0} 字節(jié)", fileStream.Position);
    }
}

File download

Method 1: Use WebClient (simple method)

Here’s an easy way to download your file:

WebClient client = new WebClient();
client.Credentials = new NetworkCredential("用戶名", "密碼");
client.DownloadFile("ftp://ftp.example.com/遠(yuǎn)程路徑/文件.zip", @"C:\本地路徑\文件.zip");

Method 2: Use FtpWebRequest (stream copy, more fine control)

This method allows finer control over the download process, achieved via stream replication:

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/遠(yuǎn)程路徑/文件.zip");
request.Credentials = new NetworkCredential("用戶名", "密碼");
request.Method = WebRequestMethods.Ftp.DownloadFile;

using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(@"C:\本地路徑\文件.zip"))
{
    ftpStream.CopyTo(fileStream);
}

Method 3: Use FtpWebRequest (blocked copy, progress tracking)

This method copies the file content in chunks to track the download progress:

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/遠(yuǎn)程路徑/文件.zip");
request.Credentials = new NetworkCredential("用戶名", "密碼");
request.Method = WebRequestMethods.Ftp.DownloadFile;

using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(@"C:\本地路徑\文件.zip"))
{
    byte[] buffer = new byte[10240];
    int read;
    while ((read = ftpStream.Read(buffer, 0, buffer.Length)) > 0)
    {
        fileStream.Write(buffer, 0, read);
        Console.WriteLine("已下載 {0} 字節(jié)", fileStream.Position);
    }
}

Remember to replace "用戶名", "密碼", "ftp://ftp.example.com/遠(yuǎn)程路徑/文件.zip", and @"C:本地路徑文件.zip" with your actual FTP server information and file path.

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