在c＃中使用内置FTP客户端上传大文件 [英] Uploading large files in using in a built in FTP client in c#
问题描述
//我在下面有这个代码可以很好地将文件从服务器上传到另一个，但我担心如果客户端有一个大文件到FTP，我正在寻找一些代码来实现缓冲/流媒体的想法文件块而不是一次性FTP文件，我想改变的代码行是requestStream.Write（fileContents，0，fileContents.Length）;这是我需要循环并将文件以块的形式发送到FTP服务器的地方，有关如何操作的任何想法吗？
// I have this code below that does fine for uploading file from a server to another, but I am concerned if the client have a large file to FTP, I am looking for some code to implement the idea of buffering/streaming chunks of the file instead of FTPing the file in one shot, the line of code that I am thinking to change is "requestStream.Write(fileContents, 0, fileContents.Length);" This is where I need to loop through and send the file in chunks to FTP server, any ideas on how to do that?
FtpWebRequest request = null;
StreamReader sourceStream = null;
Stream requestStream = null;
FtpWebResponse response = null;
try
{
//获取用于与服务器通信的对象。
// Get the object used to communicate with the server.
request = (FtpWebRequest)WebRequest.Create(@ftpServer + tmpFilename);
request.Method = WebRequestMethods.Ftp.UploadFile;
request.UsePassive = true;
request.EnableSsl = true;
//此示例假设FTP站点使用匿名登录。
// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential(ftpUser, connectionStringToFTP); //将文件内容复制到请求流。
// Copy the contents of the file to the request stream.
sourceStream = new StreamReader(@fromSource + tmpFilename);
byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
request.ContentLength = fileContents.Length;
requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
if (requestStream != null)
{
requestStream.Flush();
requestStream.Close();
requestStream.Dispose();
}
response = (FtpWebResponse)request.GetResponse();
bool ftpSuccessful = false;
if (response.StatusDescription.StartsWith("226"))
{
ftpSuccessful = true;
}
else
{
// .....等< br $>
//.....etc.
}
}
catch(...)
{ //捕获需要捕获的内容......等等。
//catch something required to be captured....etc.
}
finally
{ //关闭/处理/刷新流这里
//close/dispose/flush streams here
}
推荐答案
看看这个：
http://www.digitalcoding.com/Code-Snippets/C-Sharp/C-Code-Snippet-Upload -file-to-FTP-Server.html [ ^ ]
***编辑***
此处还有一篇文章您可以使用简单C＃FTP类 [ ^ ]
Take a look at this:
http://www.digitalcoding.com/Code-Snippets/C-Sharp/C-Code-Snippet-Upload-file-to-FTP-Server.html[^]
*** EDIT ***
There is also a article written here with a class you can use Simple C# FTP Class[^]
FTP不支持chunk并行上传只有并行块下载。
但FTP扩展 RFC 3659 [< a href =http://tools.ietf.org/html/rfc3659target =_ blanktitle =新窗口> ^ ]引入了REST命令以恢复损坏的传输。据我所知，FtpWebRequest支持此扩展， ContentOffset [ ^ ]在那里，但是请注意，服务器也必须支持它！
你也可以实现整个协议，在这里你有一篇好文章：http://www.dreamincode.net/forums/topic/35902-create-an-ftp-class-library -in -c％23 / [ ^ ]
FTP does not support chunk parallel upload only parallel chunk download.
But FTP extension RFC 3659[^] introduced the REST command to resume broken transfer. As I know FtpWebRequest is supporting this extension, ContentOffset[^] is there, but be aware, that the server also has to support it!
You can also implement the whole protocol, and here you have a good article: http://www.dreamincode.net/forums/topic/35902-create-an-ftp-class-library-in-c%23/[^]
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