FileFormatException when calling XmlWriter.Flush() - why? - Open Packaging Convention - Formats

Hello

In my .NET application I have the following problem. I'm trying to update file in Zip and doing this:

public void Save(ZipDirectory dir, string fileName)
            {
                using (var dirInfoStream = dir.createFile(fileName))
                {
                    dirInfoStream.Position = 0;

                    using (var xmlWriter = XmlWriter.Create(dirInfoStream, new XmlWriterSettings() { Indent = true }))
                    {
                        xmlWriter.WriteStartDocument();

                        xmlWriter.WriteStartElement("DirectoryInfo");

                        foreach (var file in _files.Values)
                        {
                            xmlWriter.WriteStartElement("FileInfo");
                            xmlWriter.WriteAttributeString("Name", file.Name);
                            xmlWriter.WriteAttributeString("LastWriteTime", file.LastWriteTime.ToString(CultureInfo.InvariantCulture));
                            xmlWriter.WriteEndElement();
                        }

                        xmlWriter.WriteEndElement();

                        xmlWriter.WriteEndDocument();

                        xmlWriter.Flush(); // Exception here - ???
                        dirInfoStream.Flush();
                    }
                }
            }

But when I'm calling xmlWriter.Flush() (see in bold) I'm getting this exception:

{"Compressed part has inconsistent data length."} System.Exception {System.IO.FileFormatException}

MS.Internal.IO.Packaging.CompressStream.UpdateUncompressedDataLength(Int64 dataLength) at MS.Internal.IO.Packaging.CompressStream.Read(Byte[] buffer, Int32 offset, Int32 count) at MS.Internal.IO.Zip.Crc32Calculator.CalculateStreamCrc(Stream stream) at

MS.Internal.IO.Zip.ProgressiveCrcCalculatingStream.CalculateCrc() at

MS.Internal.IO.Zip.ZipIOLocalFileBlock.UpdateReferences(Boolean closingFlag) at

MS.Internal.IO.Zip.ZipIOBlockManager.SaveContainer(Boolean closingFlag) at

MS.Internal.IO.Zip.ZipIOBlockManager.SaveStream(ZipIOLocalFileBlock blockRequestingFlush, Boolean closingFlag) at MS.Internal.IO.Zip.ZipIOModeEnforcingStream.Dispose(Boolean disposing) at

System.IO.Stream.Close() at System.IO.Stream.Dispose() at

FI.Family.FileSystem.ZipDirectory.DirectoryInfo.Save(ZipDirectory dir, String fileName) in D:\Projects\Aker\MOS-2.1\DotNET\Components\Family\FileSystem\ZipDirectory.cs:line 785 at

FI.Family.FileSystem.ZipDirectory.changeFileLastWriteTime(String fileName) in D:\Projects\Aker\MOS-2.1\DotNET\Components\Family\FileSystem\ZipDirectory.cs:line 516 at

FI.Family.FileSystem.ZipDirectory.CreateFile(String fileName, FileAccess access) in D:\Projects\Aker\MOS-2.1\DotNET\Components\Family\FileSystem\ZipDirectory.cs:line 58

In fact I don't quite understand what is happening and why I can't edit this file in this. Any help will be highly appreciated!

Thanks!