使用C＃/ .NET上传和下载二进制文件到/从FTP服务器

我正在使用.NET 4 C＃。 我试图上传，然后下载一个ZIP文件到（我的）服务器。

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, 0, fileContents.Length); } FtpWebResponse response = null; response = (FtpWebResponse)request.GetResponse(); response.Close(); } 

这似乎工作，因为我得到一个正确的大小的服务器上的文件。

1）我如何stream，而不是首先将其加载到内存中？ 我将上传非常大的文件。

并为我下载

 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, 0, bufferSize); while (readCount > 0) { writer.Write(buffer, 0, readCount); readCount = responseStream.Read(buffer, 0, bufferSize); } } } 

2）一切似乎工作…除了当我试图解压缩下载的ZIP文件，我得到一个无效的ZIP文件。

Answer 1

上传

使用.NET框架将二进制file upload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:\local\path\file.zip"); 

如果你需要更好的控制， WebClient不提供（如TLS / SSLencryption等），使用FtpWebRequest 。 简单的方法是使用Stream.CopyTo将FileStream复制到FTPstream：

 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); } 

如果您需要监控上传进度，则必须自行将文件复制到内容中：

 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（WinForms ProgressBar ），请参阅：
我们如何显示进度条上传与FtpWebRequest

如果您想上传文件夹中的所有文件，请参阅
使用WebClient上传文件的目录 。

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下载

使用.NET框架从FTP服务器下载二进制文件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:\local\path\file.zip"); 

如果你需要更好的控制， WebClient不提供（如TLS / SSLencryption等），使用FtpWebRequest 。 简单的方法是使用Stream.CopyTo将FTP响应stream复制到FileStream ：

 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); } 

如果您需要监视下载进度，则必须自行将块复制到内容中：

 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（WinForms ProgressBar ），请参阅：
FtpWebRequest FTP与ProgressBar下载

如果要从远程文件夹下载所有文件，请参阅
C＃通过FTP下载所有文件和子目录 。