在C＃中以编程方式创建新条目后，会导致zip文件中“标题丢失或损坏”的原因是什么？

Question

I am trying to create a zip file and then add 2 new entries (xml and csv file) programmatically in C#. But I successed to write first entry, and after that for some reason it makes my zip file corrupted (more precisely it causes missing or corrupted header).

So when it tries to open already existing zip file in order to write the second entry, an exception is thrown.

Exception thrown:

'System.IO.InvalidDataException' in System.IO.Compression.FileSystem.dll ("End of Central Directory record could not be found.")

    if (Path.GetExtension(fileName) == ".zip")
    {
        m_fsOutput = new FileStream(fileName, FileMode.Create);
        m_zipFile = new ZipArchive(m_fsOutput, ZipArchiveMode.Create, true);

        ZipArchiveEntry CSVentry = m_zipFile.CreateEntry(String.Format(CultureInfo.InvariantCulture, "Test{0}.csv", testCells.ElementAt(0).Test), CompressionLevel.Optimal);
        m_fsFileWriter = new StreamWriter(CSVentry.Open());
    }

This is where I initialize zip file and streamWriter for the first entry. Basically m_fsFileWriter is a type of StreamWriter and I use this object to write the file in other places.

Answer 1

I just had to do something similar a few weeks ago. The code I used was this:

List<FileStream> FilesList = new List<FileStream>();
//Add your files
using (var archive = new ZipArchive(outStream, ZipArchiveMode.Create, true))
{
    int i = 0;
    foreach (var FileStream in FilesList)
    {
        string fileName = "File"+i;
        var fileInArchive = archive.CreateEntry(fileName, CompressionLevel.Optimal);
        using (var entryStream = fileInArchive.Open())
        {

            entryStream.Flush();
            FileStream.CopyTo(entryStream);
            FileStream.Flush();

        }
        i++;
    }

}
var path = "your path";
using (var fileStream = new FileStream(path, FileMode.Create))
{
    outStream.Seek(0, SeekOrigin.Begin); 

    outStream.CopyTo(fileStream);
}

FilesList are the streams of the files you want to add to the zip archive.