Creating a ZIP archive in memory using System.IO.Compression

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I’m trying to create a ZIP archive with a simple demo text file using a MemoryStream as follows:

using (var memoryStream = new MemoryStream())
using (var archive = new ZipArchive(memoryStream , ZipArchiveMode.Create))
{
    var demoFile = archive.CreateEntry("foo.txt");

    using (var entryStream = demoFile.Open())
    using (var streamWriter = new StreamWriter(entryStream))
    {
        streamWriter.Write("Bar!");
    }

    using (var fileStream = new FileStream(@"C:\Temp\test.zip", FileMode.Create))
    {
        stream.CopyTo(fileStream);
    }
}

If I run this code, the archive file itself is created but foo.txt isn’t.

However, if I replace the MemoryStream directly with the file stream, the archive is created correctly:

using (var fileStream = new FileStream(@"C:\Temp\test.zip", FileMode.Create))
using (var archive = new ZipArchive(fileStream, FileMode.Create))
{
    // ...
}

Is it possible to use a MemoryStream to create the ZIP archive without the FileStream?

12 Answers
12

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