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OpenEntryStream returns empty stream #475

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opened 2026-01-29 22:12:38 +00:00 by claunia · 2 comments
claunia commented 2026-01-29 22:12:38 +00:00
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Originally created by @nikoslyk203 on GitHub (Sep 21, 2021).

I have downloaded a zip file as a stream through HttpClient in C# and I am trying to open one of the files inside the archive as a stream but for some reason when I use OpenEntryStream the stream returned is empty. Am I doing something wrong? The Zip File isn't corrupted because I tried to unzip the files to my disk and it did it successfully.

var zipRequest = httpClient.GetAsync(url).Result;
using (var zipStream = zipRequest.Content.ReadAsStreamAsync().Result)
using (var archive = SharpCompress.Archives.Zip.ZipArchive.Open(zipStream))
using (var xlsFileStream = archive.Entries.Where(x => x.Key == fileName).FirstOrDefault().OpenEntryStream())
{

}
Originally created by @nikoslyk203 on GitHub (Sep 21, 2021). I have downloaded a zip file as a stream through HttpClient in C# and I am trying to open one of the files inside the archive as a stream but for some reason when I use OpenEntryStream the stream returned is empty. Am I doing something wrong? The Zip File isn't corrupted because I tried to unzip the files to my disk and it did it successfully. ``` var zipRequest = httpClient.GetAsync(url).Result; using (var zipStream = zipRequest.Content.ReadAsStreamAsync().Result) using (var archive = SharpCompress.Archives.Zip.ZipArchive.Open(zipStream)) using (var xlsFileStream = archive.Entries.Where(x => x.Key == fileName).FirstOrDefault().OpenEntryStream()) { } ```
claunia added the question label 2026-01-29 22:12:38 +00:00
claunia commented 2026-01-29 22:12:38 +00:00
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@adamhathcock commented on GitHub (Sep 24, 2021):

Archives expect a random access stream. I don't know what HttpClient is doing with the response stream of that but it could not be buffered.

You should use Reader or buffer the stream yourself (to memory or a file) and see what happens.

Also, use async/await instead of .Result

@adamhathcock commented on GitHub (Sep 24, 2021): Archives expect a random access stream. I don't know what HttpClient is doing with the response stream of that but it could not be buffered. You should use Reader or buffer the stream yourself (to memory or a file) and see what happens. Also, use async/await instead of .Result
claunia commented 2026-01-29 22:12:38 +00:00
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@majorro commented on GitHub (Dec 11, 2024):

Same here, ReadAsStream returns MemoryStream btw

@majorro commented on GitHub (Dec 11, 2024): Same here, `ReadAsStream` returns `MemoryStream` btw
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Reference: starred/sharpcompress#475
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