上传文件和从 FTP 下载文件

我正在尝试制作一个上传/下载的程序.exe文件到一个FTP

我尝试使用FtpWebRequest，但我只成功上传和下载.txt文件。

然后我在这里找到了一个使用下载的解决方案WebClient:

WebClient request = new WebClient();
request.Credentials = new NetworkCredential("username", "password");
byte[] fileData =  request.DownloadData("ftp://myFTP.net/");

FileStream file = File.Create(destinatie);
file.Write(fileData, 0, fileData.Length);

file.Close();

这个解决方案有效。但我看到了WebClient有一个方法DownloadFile这没有用。我认为因为它不起作用FTP仅在HTTP。我的假设是真的吗？如果不是，我怎样才能让它工作？

还有其他上传/下载的解决方案吗？.exe文件到 ftp 使用FtpWebRequest?

Both WebClient.UploadFile https://learn.microsoft.com/en-us/dotnet/api/system.net.webclient.uploadfile and WebClient.DownloadFile https://learn.microsoft.com/en-us/dotnet/api/system.net.webclient.downloadfile对于 FTP 和二进制文件都可以正常工作。

Upload

WebClient client = new WebClient();
client.Credentials = new NetworkCredential("username", "password");
client.UploadFile(
    "ftp://ftp.example.com/remote/path/file.zip", @"C:\local\path\file.zip");

如果您需要更大的控制权，那么WebClient不提供（例如TLS/SSL 加密 https://stackoverflow.com/q/4331665/850848#56888555、ascii/文本传输模式、传输恢复等），使用FtpWebRequest https://learn.microsoft.com/en-us/dotnet/api/system.net.ftpwebrequest。简单的方法就是复制一个FileStream使用 FTP 流Stream.CopyTo https://learn.microsoft.com/en-us/dotnet/api/system.io.stream.copyto:

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.UploadFile;  

using (Stream fileStream = File.OpenRead(@"C:\local\path\file.zip"))
using (Stream ftpStream = request.GetRequestStream())
{
    fileStream.CopyTo(ftpStream);
}

如果你需要监控上传进度，你必须自己分块复制内容：

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.UploadFile;  

using (Stream fileStream = File.OpenRead(@"C:\local\path\file.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("Uploaded {0} bytes", fileStream.Position);
    } 
}

对于 GUI 进度（WinFormsProgressBar), see:
我们如何使用 FtpWebRequest 显示上传进度条 https://stackoverflow.com/q/6341024/850848#45931971

如果您想上传文件夹中的所有文件，请参阅
C# 递归上传到FTP服务器 https://stackoverflow.com/q/60925131/850848.

Download

WebClient client = new WebClient();
client.Credentials = new NetworkCredential("username", "password");
client.DownloadFile(
    "ftp://ftp.example.com/remote/path/file.zip", @"C:\local\path\file.zip");

如果您需要更大的控制权，那么WebClient不提供（例如TLS/SSL 加密 https://stackoverflow.com/q/4331665/850848#56888555, ascii/文本传输模式,恢复传输 https://stackoverflow.com/q/6331133/850848#66154869等），使用FtpWebRequest https://learn.microsoft.com/en-us/dotnet/api/system.net.ftpwebrequest。简单的方法是将 FTP 响应流复制到FileStream using Stream.CopyTo https://learn.microsoft.com/en-us/dotnet/api/system.io.stream.copyto:

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.DownloadFile;

using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(@"C:\local\path\file.zip"))
{
    ftpStream.CopyTo(fileStream);
}

如果你需要监控下载进度，你必须自己分块复制内容：

FtpWebRequest request =
    (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.DownloadFile;

using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(@"C:\local\path\file.zip"))
{
    byte[] buffer = new byte[10240];
    int read;
    while ((read = ftpStream.Read(buffer, 0, buffer.Length)) > 0)
    {
        fileStream.Write(buffer, 0, read);
        Console.WriteLine("Downloaded {0} bytes", fileStream.Position);
    }
}

对于 GUI 进度（WinFormsProgressBar), see:
FtpWebRequest 使用进度条进行 FTP 下载 https://stackoverflow.com/q/45269263/850848

如果您想从远程文件夹下载所有文件，请参阅
C# 通过FTP下载所有文件及子目录 https://stackoverflow.com/q/37038676/850848.