列出位于C#中SFTP服务器上的ZIP文件中的文件 [英] List files inside ZIP file located on SFTP server in C#

问题描述

我需要通过ASP.NET Core以编程方式处理SFTP服务器(WinSCP)的ZIP文件中的文件夹.

I need to process folders inside a ZIP file from SFTP server (WinSCP) programmatically through ASP.NET Core.

有什么方法可以获取ZIP文件中的文件列表，而无需下载到本地计算机?作为文件大小会很高，并且不会保持一致.任何帮助将不胜感激.

Is there any way where I can get list of files inside ZIP file without downloading to local computer? As the file size would be high and won't be in a consistent manner. Any help would be appreciated.

推荐答案

使用 SSH.NET库，它可能像这样简单:

With SSH.NET library, it could be as easy as:

using (var client = new SftpClient(host, username, password)
{
    client.Connect();

    using (Stream stream = client.OpenRead("/remote/path/archive.zip"))
    using (var archive = new ZipArchive(stream, ZipArchiveMode.Read))
    {
        foreach (var entry in archive.Entries)
        {
            Console.WriteLine(entry);
        }
    }
}

您需要引用 System.IO.Compression 程序集以获取

You need to reference System.IO.Compression assembly to get the ZipArchive.

该代码将仅读取(下载)ZIP中央目录记录，而不是整个ZIP存档.

The code will only read (download) the ZIP central directory record, not whole ZIP archive.

不幸的是，该库中存在一个错误.要解决此问题，您必须像这样实现包装器 Stream 的实现:

Unfortunately, there's a bug in the library. To workaround it, you have to implement a wrapper Stream implementation like this:

class FixStream : Stream
{
    public override long Seek(long offset, SeekOrigin origin)
    {
        long result;
        // workaround for SSH.NET bug in implementation of SeekOrigin.End
        if (origin == SeekOrigin.End)
        {
            result = _stream.Seek(Length + offset, SeekOrigin.Begin);
        }
        else
        {
            result = _stream.Seek(offset, origin);
        }
        return result;
    }

    // passthrough implementation of the rest of Stream interface

    public override bool CanRead => _stream.CanRead;

    public override bool CanSeek => _stream.CanSeek;

    public override bool CanWrite => _stream.CanWrite;

    public override long Length => _stream.Length;

    public override long Position { 
        get => _stream.Position; set => _stream.Position = value; }

    public FixStream(Stream stream)
    {
        _stream = stream;
    }

    public override void Flush()
    {
        _stream.Flush();
    }

    public override int Read(byte[] buffer, int offset, int count)
    {
        return _stream.Read(buffer, offset, count);
    }

    public override void SetLength(long value)
    {
        _stream.SetLength(value);
    }

    public override void Write(byte[] buffer, int offset, int count)
    {
        _stream.Write(buffer, offset, count);
    }

    private Stream _stream;
}

并将 SftpFileStream 包裹到其中:

using (Stream stream = client.OpenRead("/remote/path/archive.zip"))
using (var stream2 = new FixStream(stream))
using (var archive = new ZipArchive(stream2, ZipArchiveMode.Read))
{
    ...
}

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