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ZipReader OpenEntryStream / WriteEntryTo NullReferenceException with .NET 6.0 #478

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opened 2026-01-29 22:12:44 +00:00 by claunia · 0 comments
claunia commented 2026-01-29 22:12:44 +00:00
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Originally created by @Pyroluk on GitHub (Nov 17, 2021).

Hi,

ZipReader's OpenEntryStream() and WriteEntryTo() are throwing NullReferenceException when using .NET 6. Same code works perfectly fine with .NET 5.

string expectedTestResult = "";

using (var inputMs = new MemoryStream(Encoding.UTF8.GetBytes(xmlFileElement.Attribute("testResults").Value)))
using (CryptoStream base64Stream = new CryptoStream(inputMs, new FromBase64Transform(), CryptoStreamMode.Read))
using (var zipReader = ReaderFactory.Open(base64Stream))
using (var outputMs = new MemoryStream())
{
    zipReader.MoveToNextEntry();
    using (var zipStream = zipReader.OpenEntryStream())
        zipStream.CopyTo(outputMs);
    expectedTestResult = Encoding.UTF8.GetString(outputMs.ToArray());
}

Hope it is a quick and easy fix.

Thank you for providing this awesome project.

Cheers!

Originally created by @Pyroluk on GitHub (Nov 17, 2021). Hi, ZipReader's OpenEntryStream() and WriteEntryTo() are throwing NullReferenceException when using .NET 6. Same code works perfectly fine with .NET 5. ``` string expectedTestResult = ""; using (var inputMs = new MemoryStream(Encoding.UTF8.GetBytes(xmlFileElement.Attribute("testResults").Value))) using (CryptoStream base64Stream = new CryptoStream(inputMs, new FromBase64Transform(), CryptoStreamMode.Read)) using (var zipReader = ReaderFactory.Open(base64Stream)) using (var outputMs = new MemoryStream()) { zipReader.MoveToNextEntry(); using (var zipStream = zipReader.OpenEntryStream()) zipStream.CopyTo(outputMs); expectedTestResult = Encoding.UTF8.GetString(outputMs.ToArray()); } ``` Hope it is a quick and easy fix. Thank you for providing this awesome project. Cheers!
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Reference: starred/sharpcompress#478
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