在使用System.IO.Compression提取文件期间强制替换现有文件

本文关键字：文件 替换 System IO Compression 提取 | 更新日期: 2023-09-27 17:58:36

我使用以下代码提取文件夹中的所有文件

        using (ZipArchive archive = new ZipArchive(zipStream))
        {
            archive.ExtractToDirectory(location);
        }

但如果存在一个文件，则会引发异常。是否有任何方法可以告诉压缩API替换现有文件。

我发现一种方法是先获取所有文件名，然后检查文件是否存在并删除它。但这对我来说代价高昂。

在使用System.IO.Compression提取文件期间强制替换现有文件

我已经创建了一个扩展。，任何对其改进的评论都将不胜感激

public static class ZipArchiveExtensions
{
    public static void ExtractToDirectory(this ZipArchive archive, string destinationDirectoryName, bool overwrite)
    {
        if (!overwrite)
        {
            archive.ExtractToDirectory(destinationDirectoryName);
            return;
        }
        DirectoryInfo di = Directory.CreateDirectory(destinationDirectoryName);
        string destinationDirectoryFullPath = di.FullName;
        foreach (ZipArchiveEntry file in archive.Entries)
        {
            string completeFileName = Path.GetFullPath(Path.Combine(destinationDirectoryFullPath, file.FullName));
            if (!completeFileName.StartsWith(destinationDirectoryFullPath, StringComparison.OrdinalIgnoreCase))
            {
                throw new IOException("Trying to extract file outside of destination directory. See this link for more info: https://snyk.io/research/zip-slip-vulnerability");
            }
            if (file.Name == "")
            {// Assuming Empty for Directory
                Directory.CreateDirectory(Path.GetDirectoryName(completeFileName));
                continue;
            }
            file.ExtractToFile(completeFileName, true);
        }
    }
}

当文件夹不存在时，此代码不会抛出异常，而不是创建文件夹。

public static class ZipArchiveExtensions
{
    public static void ExtractToDirectory(this ZipArchive archive, string destinationDirectoryName, bool overwrite)
    {
        if (!overwrite)
        {
            archive.ExtractToDirectory(destinationDirectoryName);
            return;
        }
        foreach (ZipArchiveEntry file in archive.Entries)
        {
            string completeFileName = Path.Combine(destinationDirectoryName, file.FullName);
            string directory = Path.GetDirectoryName(completeFileName);
            if (!Directory.Exists(directory))
                Directory.CreateDirectory(directory);
            if (file.Name != "")
                file.ExtractToFile(completeFileName, true);
        }
    }
}

看看这个：在.NET 4.5中轻松创建zip文件。你的问题似乎得到了解决。或者，您也可以检查DotNetZip。

由于我是Linq的忠实粉丝，Linq的方式仅供参考：

using (var strm = File.OpenRead(zipPath))
using (ZipArchive a = new ZipArchive(strm))
{
    a.Entries.Where(o => o.Name == string.Empty && !Directory.Exists(Path.Combine(basePath, o.FullName))).ToList().ForEach(o => Directory.CreateDirectory(Path.Combine(basePath, o.FullName)));
    a.Entries.Where(o => o.Name != string.Empty).ToList().ForEach(e => e.ExtractToFile(Path.Combine(basePath, e.FullName), true));
}

自.NET Standard 2.1以来，将overwriteFiles设置为true非常简单：ZipFile.ExtractToDirectory(string sourceFile, string destDir, Encoding entryNameEncoding, bool overwriteFiles)

Example:
ZipFile.ExtractToDirectory("c:''file.zip","c:''destination_folder", Encoding.UTF8, true);

您可以将文件提取到某个临时目录，然后使用"File.Copy"与ovveride选项true到您的目标目录

我知道这不是一个完美的解决方案，但这样你就不需要检查文件是否存在

这里有一个方法，它获取zip文件的路径。

基于已接受的答案。

    public void ExtractZipFileToDirectory(string sourceZipFilePath, string destinationDirectoryName, bool overwrite)
    {
        using (var archive = ZipFile.Open(sourceZipFilePath, ZipArchiveMode.Read))
        {
            if (!overwrite)
            {
                archive.ExtractToDirectory(destinationDirectoryName);
                return;
            }
            DirectoryInfo di = Directory.CreateDirectory(destinationDirectoryName);
            string destinationDirectoryFullPath = di.FullName;
            foreach (ZipArchiveEntry file in archive.Entries)
            {
                string completeFileName = Path.GetFullPath(Path.Combine(destinationDirectoryFullPath, file.FullName));
                if (!completeFileName.StartsWith(destinationDirectoryFullPath, StringComparison.OrdinalIgnoreCase))
                {
                    throw new IOException("Trying to extract file outside of destination directory. See this link for more info: https://snyk.io/research/zip-slip-vulnerability");
                }
                if (file.Name == "")
                {// Assuming Empty for Directory
                    Directory.CreateDirectory(Path.GetDirectoryName(completeFileName));
                    continue;
                }
                file.ExtractToFile(completeFileName, true);
            }
        }
    }

嗨，我正在使用从金块下载的DotNetZip。我只是简单地使用这个代码。这将自动替换目录中的文件（如果存在）。"超级安静"！

using (ZipFile archive = new ZipFile(@"" + System.Environment.CurrentDirectory + "''thezipfile.zip"))
{
     archive.ExtractAll(@"" + System.Environment.CurrentDirectory, ExtractExistingFileAction.OverwriteSilently);
}

当您有zip文件路径时，这很有用

public static class ZipArchiveHelper
    {
        public static void ExtractToDirectory(string archiveFileName, string destinationDirectoryName, bool overwrite)
        {
            if (!overwrite)
            {
                ZipFile.ExtractToDirectory(archiveFileName, destinationDirectoryName);
            }
            else
            {
                using (var archive = ZipFile.OpenRead(archiveFileName))
                {
                    foreach (var file in archive.Entries)
                    {
                        var completeFileName = Path.Combine(destinationDirectoryName, file.FullName);
                        var directory = Path.GetDirectoryName(completeFileName);
                        if (!Directory.Exists(directory) && !string.IsNullOrEmpty(directory))
                            Directory.CreateDirectory(directory);
                        if (file.Name != "")
                            file.ExtractToFile(completeFileName, true);
                    }
                }
            }            
        }
    }

从答案中重新制作一个小方法来创建所有文件夹

public static void ExtractToDirectory(this ZipArchive archive, string destinationDirectoryName, bool overwrite)
{
    if (!overwrite)
    {
        archive.ExtractToDirectory(destinationDirectoryName);
        return;
    }
    foreach (ZipArchiveEntry file in archive.Entries)
    {
        string completeFileName = Path.Combine(destinationDirectoryName, file.FullName);
        if (file.Name == "")
        {// Assuming Empty for Directory
            Directory.CreateDirectory(Path.GetDirectoryName(completeFileName));
            continue;
        }
        // create dirs
        var dirToCreate = destinationDirectoryName;
        for (var i = 0; i < file.FullName.Split('/').Length - 1; i++)
        {
            var s = file.FullName.Split('/')[i];
            dirToCreate = Path.Combine(dirToCreate, s);
            if (!Directory.Exists(dirToCreate))
                Directory.CreateDirectory(dirToCreate);
        }
        file.ExtractToFile(completeFileName, true);
    }
}

似乎避免包含该代码块的唯一方法是在使用del:提取存档之前简单地删除文件

del (location + "'*")
using (ZipArchive archive = new ZipArchive(zipStream))
{
  archive.ExtractToDirectory(location);
}

这并不完全是OP想要的，但它很紧凑。

一种更好的代码，

不检查目录是否存在（创建时会自动检查）

零堆分配（而不是用于的foreach）

使用

using var stream = someStream;
using var zipArchive = new ZipArchive(stream);
zipArchive.ExtractToDirectoryEx(path);

public static class ZipArchiveExtensions
{
    [SuppressMessage("ReSharper", "ForCanBeConvertedToForeach")]
    public static void ExtractToDirectoryEx(this ZipArchive source, string destinationDirectoryName)
    {
        var entries = source.Entries;
        for (var i = 0; i < entries.Count; i++)
        {
            var entry = entries[i];
            var completeFileName = Path.Combine(destinationDirectoryName, entry.FullName);
            var directory = Path.GetDirectoryName(completeFileName);
            Directory.CreateDirectory(directory);
            if (entry.Name != string.Empty)
            {
                entry.ExtractToFile(completeFileName, overwrite: true);
            }
        }
    }
}
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