从包含 zip 的流中提取文件

Question

I am making a GET request using HttpClient to download a zip file from the internet. I want to extract all the files contained in the zip file without saving the zip file to disk. Currently, I am able to download and save the zip file to disk, extract its contents and then delete the zip file from disk. This perfectly fine. However, I want to optimize the process. I found a way to extract the contents directly from the downloaded zip stream but I have to specify the filenames and extensions. I am not sure how to extract the contents while preserving their original filenames and extensions without me specifying them.

Current Approach:

string requestUri = "https://www.nuget.org/api/v2/package/" + PackageName + "/" + PackageVersion;
HttpResponseMessage response = await client.GetAsync(requestUri);
response.EnsureSuccessStatusCode();
using Stream PackageStream = await response.Content.ReadAsStreamAsync();
SaveStream($"{DownloadPath}.zip", PackageStream);
ZipFile.ExtractToDirectory($"{DownloadPath}.zip", ExtractPath);
File.Delete($"{DownloadPath}.zip");

// Directly extract Zip contents without saving file and without losing filename and extension
using (ZipArchive archive = new ZipArchive(await response.Content.ReadAsStreamAsync()))
{
   foreach (ZipArchiveEntry entry in archive.Entries)
   {
       using (Stream stream = entry.Open())
       {
           using (FileStream file = new FileStream("file.txt", FileMode.Create, FileAccess.Write))
           {
               stream.CopyTo(file);
           }
       }
   }
}

.NET 4.8
.NET Core 3.1
C# 8.0

Any help in this regards would be appreciated.
Please feel free to comment on alternative approaches or suggestions.
Thank you in advance.

Answer 1

ZipArchiveEntry has a Name and FullName property that can be used to get the names of the files within the archive while preserving their original filenames and extensions

The FullName property contains the relative path, including the subdirectory hierarchy, of an entry in a zip archive. (In contrast, the Name property contains only the name of the entry and does not include the subdirectory hierarchy.)

For example

using (ZipArchive archive = new ZipArchive(await response.Content.ReadAsStreamAsync())) {
    foreach (ZipArchiveEntry entry in archive.Entries) {
        using (Stream stream = entry.Open()) {                        
            string destination = Path.GetFullPath(Path.Combine(downloadPath, entry.FullName));

            var directory = Path.GetDirectoryName(destination);
            if (!Directory.Exists(directory))
                Directory.CreateDirectory(directory);

            using (FileStream file = new FileStream(destination, FileMode.Create, FileAccess.Write)) {
                await stream.CopyToAsync(file);
            }
        }
    }
}

will extract the files in the same subdirectory hierarchy as they were stored in the archive while if entry.Name was used, all the files would be extracted to the same location.