Chapter100:Readingandwriting.zipfiles

Parameter                                                                          Details

archiveFileName Thepathtothearchivetoopen,specifiedasarelativeorabsolutepath.Arelativepathis interpreted as relative to the current working directory.

Section100.1:Writingtoazipfile

Towriteanew.zipfile:

System.IO.Compression

System.IO.Compression.FileSystem

using(FileStreamzipToOpen=newFileStream(@”C:\temp”,FileMode.Open))

{

using(ZipArchivearchive=newZipArchive(zipToOpen,ZipArchiveMode.Update))

{

ZipArchiveEntryreadmeEntry=archive.CreateEntry(“Readme.txt”); using(StreamWriterwriter=newStreamWriter(readmeEntry.Open()))

{

writer.WriteLine(“Informationaboutthispackage.”);

writer.WriteLine(“========================”);

}

}

}

Section100.2:WritingZipFilesin-memory

Thefollowingexamplewillreturnthebyte[]dataofazippedfilecontainingthefilesprovidedtoit,without needingaccesstothefilesystem.

publicstaticbyte[]ZipFiles(Dictionary<string,byte[]>files)

{

using(MemoryStreamms=newMemoryStream())

{

using(ZipArchivearchive=newZipArchive(ms,ZipArchiveMode.Update))

{

foreach(varfileinfiles)

{

ZipArchiveEntryorderEntry=archive.CreateEntry(file.Key);//createafilewith

thisname

using(BinaryWriterwriter=newBinaryWriter(orderEntry.Open()))

{

writer.Write(file.Value);//writethebinarydata

}

}

}

//ZipArchivemustbedisposedbeforetheMemoryStreamhasdata

returnms.ToArray();

}

}

Section100.3:GetfilesfromaZipfile

Thisexamplegetsalistingoffilesfromtheprovidedziparchivebinary data:

publicstaticDictionary<string,byte[]>GetFiles(byte[]zippedFile)

{

using(MemoryStreamms=newMemoryStream(zippedFile))

using(ZipArchivearchive=newZipArchive(ms,ZipArchiveMode.Read))

{

returnarchive.Entries.ToDictionary(x=>x.FullName,x=>ReadStream(x.Open()));

}

}

privatestaticbyte[]ReadStream(Streamstream)

{

using(varms=newMemoryStream())

{

stream.CopyTo(ms);

returnms.ToArray();

}

}

Section100.4:Thefollowingexampleshowshowtoopenazip archiveandextractall.txtfilestoafolder

usingSystem;

usingSystem.IO;

usingSystem.IO.Compression;

namespaceConsoleApplication1

{

classProgram

{

staticvoidMain(string[]args)

{

stringzipPath=@”c:\example\start.zip”;

stringextractPath=@”c:\example\extract”;

using(ZipArchivearchive=ZipFile.OpenRead(zipPath))

{

foreach(ZipArchiveEntryentryinarchive.Entries)

{

if(entry.FullName.EndsWith(“.txt”,StringComparison.OrdinalIgnoreCase))

{

entry.ExtractToFile(Path.Combine(extractPath,entry.FullName));

}

}

}

}

}

}