Question 86416 in ASP.NET Question posted in
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Unzip .zip File without Writing to Disc from Response c# – Asp.net

Let me preface by stating that I’ somewhat new to dealing with zipping/unzipping/reading/reading files. That being said, I’m doing a PoC that will retrieve data via api and write the responses to a database. The response is a zip file and inside this zip is the json data I will be reading and writing to the database.

I’m having some trouble unzipping and reading the information. Please find the code below:

HttpClient client = new HttpClient();
            HttpRequestMessage request = new HttpRequestMessage
            {
                Method = HttpMethod.Get,
                RequestUri = new Uri(baseUrl),
                Headers =
                {
                    { "X-API-TOKEN", apiKey },
                },

            };

            using (var response = await client.SendAsync(request))
            {
                response.EnsureSuccessStatusCode();
                var body = await response.Content.ReadAsStringAsync();
               // here is where I am stuck - not sure how I would unzip and read the contents
            }

Thanks

Tags:

2

Answers


  1. 0

    You can convert body to a byte array and then unzip it using MemoryStream.

        byte[] bytes = Encoding.ASCII.GetBytes(body);
    using (var mso = new MemoryStream(bytes)) {
        using (var gs = new GZipStream(msi, CompressionMode.Decompress)) {
            CopyTo(gs, mso);
        }

        return Encoding.UTF8.GetString(mso.ToArray());
    }
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  2. 0

    Assuming you actually have a .zip file, you don’t need a MemoryStream, you just need to pass the existing stream to ZipArchive

    static HttpClient client = new HttpClient();  // always keep static client

async Task GetZip()
{
    using var request = new HttpRequestMessage(HttpMethod.Get, new Uri(baseUrl))
    {
        Headers = {
            { "X-API-TOKEN", apiKey },
        },
    };
    using var response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);

    response.EnsureSuccessStatusCode();
    using var stream = await response.Content.ReadAsStreamAsync();
    await ProcessZip(stream);
}

async Task ProcessZip(Stream zipStream)
{
    using var zip = new ZipArchive(zipStream, ZipArchiveMode.Read);
    foreach (var file in zip.Entries)
    {
        using var entryStream = file.Open();
        await ....; // do stuff here
    }
}
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