使用.NET框架将二进制文件上传到FTP服务器的最简单的方法是使用WebClient.UploadFile：
WebClient client = new WebClient();client.Credentials = new NetworkCredential('username', 'password');client.UploadFile('ftp://ftp.example.com/remote/path/file.zip', @'C:localpathfile.zip');
如果您需要更大的控制权WebClient（例如TLS /SSL加密等），则无法使用，请使用FtpWebRequest。简单的方法是FileStream使用Stream.CopyTo以下命令将a复制到FTP流：
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:localpathfile.zip'))using (Stream ftpStream = request.GetRequestStream()){ fileStream.copyTo(ftpStream);}
如果需要监视上传进度，则必须自己逐块复制内容：
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:localpathfile.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); } }
有关GUI进度（WinForms ProgressBar），请参见：我们如何显示进度栏，以便使用FtpWebRequest上传
如果要从文件夹上传所有文件，请参阅C＃中的“递归上传到FTP服务器”。
下载使用.NET框架从FTP服务器下载二进制文件的最简单的方法是使用WebClient.DownloadFile：
WebClient client = new WebClient();client.Credentials = new NetworkCredential('username', 'password');client.DownloadFile( 'ftp://ftp.example.com/remote/path/file.zip', @'C:localpathfile.zip');
如果您需要更大的控制权WebClient（例如TLS /SSL加密等），则无法使用，请使用FtpWebRequest。简单的方法是将FTP响应流复制到FileStream使用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:localpathfile.zip')){ ftpStream.copyTo(fileStream);}
如果需要监视下载进度，则必须自己逐块复制内容：
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:localpathfile.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); }}
有关GUI进度（WinForms ProgressBar），请参见：FtpWebRequest使用ProgressBar下载FTP
如果要从远程文件夹下载所有文件，请参见C＃通过FTP下载所有文件和子目录。
解决方法我正在使用.NET 4 C＃。我正在尝试上传ZIP文件，然后将其下载到（我的）服务器。
对于上传我有
using (WebClient client = new WebClient()){ FtpWebRequest request = (FtpWebRequest)WebRequest.Create(MyUrl); request.Method = WebRequestMethods.Ftp.UploadFile; request.EnableSsl = false; request.Credentials = new NetworkCredential(MyLogin,MyPassword); byte[] fileContents = null; using (StreamReader sourceStream = new StreamReader(LocalFilePath)) {fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd()); } request.ContentLength = fileContents.Length; using (Stream requestStream = request.GetRequestStream()) {requestStream.Write(fileContents,fileContents.Length); } FtpWebResponse response = null; response = (FtpWebResponse)request.GetResponse(); response.Close();}
这似乎可行，因为我在服务器上获得了正确大小的文件。
1）我如何流式传输它，而不是先将其加载到内存中？我将上传非常大的文件。
对于下载，我有
using (WebClient client = new WebClient()){ string HtmlResult = String.Empty; FtpWebRequest request = (FtpWebRequest)WebRequest.Create(remoteFile); request.Method = WebRequestMethods.Ftp.DownloadFile; request.EnableSsl = false; request.Credentials = new NetworkCredential(MyLogin,MyPassword); using (FtpWebResponse response = (FtpWebResponse)request.GetResponse()) using (Stream responseStream = response.GetResponseStream()) using (StreamReader reader = new StreamReader(responseStream)) using (FileStream writer = new FileStream(localFilename,FileMode.Create)) {long length = response.ContentLength;int bufferSize = 2048;int readCount;byte[] buffer = new byte[2048];readCount = responseStream.Read(buffer,bufferSize);while (readCount > 0){ writer.Write(buffer,readCount); readCount = responseStream.Read(buffer,bufferSize);} }}
2）一切似乎都可以正常工作……除了当我尝试解压缩下载的ZIP文件时，我得到的是无效的ZIP文件。
