Extracting all the files into a directory is very easy:
using (FileStream fs = new FileStream("archive.zip", FileMode.Open))
using (ZipArchive archive = new ZipArchive(fs, ZipArchiveMode.Read))
{
archive.ExtractToDirectory(AppDomain.CurrentDomain.BaseDirectory);
}
When the file already exists, a System.IO.IOException will be thrown.
Extracting specific files:
using (FileStream fs = new FileStream("archive.zip", FileMode.Open))
using (ZipArchive archive = new ZipArchive(fs, ZipArchiveMode.Read))
{
// Get a root entry file
archive.GetEntry("test.txt").ExtractToFile("test_extracted_getentries.txt", true);
// Enter a path if you want to extract files from a subdirectory
archive.GetEntry("sub/subtest.txt").ExtractToFile("test_sub.txt", true);
// You can also use the Entries property to find files
archive.Entries.FirstOrDefault(f => f.Name == "test.txt")?.ExtractToFile("test_extracted_linq.txt", true);
// This will throw a System.ArgumentNullException because the file cannot be found
archive.GetEntry("nonexistingfile.txt").ExtractToFile("fail.txt", true);
}
Any of these methods will produce the same result.