Zip file is getting corrupted after uploaded to server using C#(使用 C# 上传到服务器后，Zip 文件损坏)

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问题描述

我正在尝试使用 C# (Framework 4)上传一个 zip 文件到服务器，下面是我的代码.

I am trying to upload a zip file to server using C# (Framework 4)and following is my code.

string ftpUrl = ConfigurationManager.AppSettings["ftpAddress"];
string ftpUsername = ConfigurationManager.AppSettings["ftpUsername"];
string ftpPassword = ConfigurationManager.AppSettings["ftpPassword"];  
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpUrl + "Transactions.zip");  
request.Proxy = new WebProxy(); //-----The requested FTP command is not supported when using HTTP proxy.
request.Method = WebRequestMethods.Ftp.UploadFile;
request.Credentials = new NetworkCredential(ftpUsername, ftpPassword);
StreamReader sourceStream = new StreamReader(fileToBeUploaded);
byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Console.WriteLine("Upload File Complete, status {0}", response.StatusDescription);
            response.Close();

zip 文件已成功上传，但是当我尝试从服务器(手动)打开 zip 文件时，它显示 Unexpected end of archive 错误.
对于文件压缩，我使用 Ionic.zip dll.在传输 zip 文件之前，我能够成功解压.

The zip file is uploaded successfully, but when I tried to open the zip file from server(manually), it showed me Unexpected end of archive error.
For file compression I am using Ionic.zip dll. Before transferring the zip file, I was able to extract successfully.

任何帮助表示赞赏.谢谢.

Any help appreciated. Thanks.

推荐答案

这是问题所在:

StreamReader sourceStream = new StreamReader(fileToBeUploaded);
byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());

StreamReader(和任何 TextReader)用于 text 数据.zip 文件不是文本数据.

StreamReader (and any TextReader) is for text data. A zip file isn't text data.

只需使用:

byte[] fileContents = File.ReadAllBytes(fileToBeUploaded);

这样您就不会将二进制数据视为文本，因此它不应该被破坏.

That way you're not treating binary data as text, so it shouldn't get corrupted.

或者，不要单独将其全部加载到内存中 - 只需流式传输数据:

Or alternatively, don't load it all into memory separately - just stream the data:

using (var requestStream = request.GetRequestStream())
{
    using (var input = File.OpenRead(fileToBeUploaded))
    {
        input.CopyTo(requestStream);
    }
}

还请注意，您应该对所有这些流使用 using 语句，而不仅仅是调用 Close - 这样即使出现异常，资源也会被释放扔了.

Also note that you should be using using statements for all of these streams, rather than just calling Close - that way the resources will be disposed even if an exception is thrown.

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