How can I upload and download files to/from an FTP server using C#/.NET?

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:

<code class="language-csharp">WebClient client = new WebClient();
client.Credentials = new NetworkCredential("用户名", "密码");
client.UploadFile("ftp://ftp.example.com/远程路径/文件.zip", @"C:\本地路径\文件.zip");</code>

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

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

<code class="language-csharp">FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/远程路径/文件.zip");
request.Credentials = new NetworkCredential("用户名", "密码");
request.Method = WebRequestMethods.Ftp.UploadFile;

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

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

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

<code class="language-csharp">FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/远程路径/文件.zip");
request.Credentials = new NetworkCredential("用户名", "密码");
request.Method = WebRequestMethods.Ftp.UploadFile;

using (Stream fileStream = File.OpenRead(@"C:\本地路径\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("已上传 {0} 字节", fileStream.Position);
    }
}</code>

File download

Method 1: Use WebClient (simple method)

Here’s an easy way to download your file:

<code class="language-csharp">WebClient client = new WebClient();
client.Credentials = new NetworkCredential("用户名", "密码");
client.DownloadFile("ftp://ftp.example.com/远程路径/文件.zip", @"C:\本地路径\文件.zip");</code>

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

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

<code class="language-csharp">FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/远程路径/文件.zip");
request.Credentials = new NetworkCredential("用户名", "密码");
request.Method = WebRequestMethods.Ftp.DownloadFile;

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

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

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

<code class="language-csharp">FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/远程路径/文件.zip");
request.Credentials = new NetworkCredential("用户名", "密码");
request.Method = WebRequestMethods.Ftp.DownloadFile;

using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(@"C:\本地路径\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("已下载 {0} 字节", fileStream.Position);
    }
}</code>

Remember to replace "用户名", "密码", "ftp://ftp.example.com/远程路径/文件.zip", and @"C:本地路径文件.zip" with your actual FTP server information and file path.

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