问题描述

request = MakeConnection(uri, WebRequestMethods.Ftp.DownloadFile, username, password);
response = (FtpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();

//This part of the code is  used to write the read content from the server
using (StreamReader responseReader = new StreamReader(responseStream))
{
    using (var destinationStream = new FileStream(toFilenameToWrite, FileMode.Create))
    {
        byte[] fileContents = Encoding.UTF8.GetBytes(responseReader.ReadToEnd());
        destinationStream.Write(fileContents, 0, fileContents.Length);
    }
}

//This part of the code is  used to write the read content from the server
using (var destinationStream = new FileStream(toFilenameToWrite, 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)
    {
        destinationStream.Write(buffer, 0, readCount);
        readCount = responseStream.Read(buffer, 0, bufferSize);
    }
}

前者将内容写入文件，但当我尝试打开文件时，它说它已损坏.但是后者在下载 zip 文件时完美地完成了这项工作.之前的代码对 zip 文件不起作用，因为它对文本文件非常有效，是否有任何具体原因?

The former ones writes the content to the file but when I try to open the file it says it is corrupted. But the later one does the job perfectly when downloading zip files. Is there any specific reason why the former code doesn't work for zip files as it works perfectly for text files?

推荐答案

byte[] fileContents = Encoding.UTF8.GetBytes(responseReader.ReadToEnd());

您尝试将二进制 PDF 文件解释为 UTF-8 文本.那是行不通的.

You try to interpret a binary PDF file as an UTF-8 text. That just cannot work.

有关正确代码，请参阅在 C#/.NET 中向/从 FTP 服务器上传和下载二进制文件.

For a correct code, see Upload and download a binary file to/from FTP server in C#/.NET.

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