在.NET可以通过多种方式实现zip的压缩和解压：1、使用System.IO.Packaging；2、使用第三方类库；3、通过 System.IO.Compression 命名空间中新增的ZipArchive、ZipFile等类实现。
一、使用System.IO.Packaging压缩和解压
Package为一个抽象类，可用于将对象组织到定义的物理格式的单个实体中，从而实现可移植性与高效访问。ZIP 文件是Package的主物理格式。 其他Package实现可以使用其他物理格式（如 XML 文档、数据库或 Web 服务。与文件系统类似，在分层组织的文件夹和文件中引用 Package 中包含的项。虽然 Package 是抽象类，但 Package.Open 方法默认使用 ZipPackage 派生类。
System.IO.Packaging在Windowsbase.dll程序集下，使用时需要添加对Windowsbase的引用。
1、将整个文件夹压缩成zip
////// Add a folder along with its subfolders to a Package /// /// The folder to add /// The package to create /// Override exsisitng files ///static bool PackageFolder(string folderName, string compressedFileName, bool overrideExisting) { if (folderName.EndsWith(@"")) folderName = folderName.Remove(folderName.Length - 1); bool result = false; if (!Directory.Exists(folderName)) { return result; } if (!overrideExisting && File.Exists(compressedFileName)) { return result; } try { using (Package package = Package.Open(compressedFileName, FileMode.Create)) { var fileList = Directory.EnumerateFiles(folderName, "*", SearchOption.AllDirectories); foreach (string fileName in fileList) { //The path in the package is all of the subfolders after folderName string pathInPackage; pathInPackage = Path.GetDirectoryName(fileName).Replace(folderName, string.Empty) + "/" + Path.GetFileName(fileName); Uri partUridocument = PackUriHelper.CreatePartUri(new Uri(pathInPackage, UriKind.Relative)); PackagePart packagePartdocument = package.CreatePart(partUridocument,"", CompressionOption.Maximum); using (FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read)) { fileStream.CopyTo(packagePartdocument.GetStream()); } } } result = true; } catch (Exception e) { throw new Exception("Error zipping folder " + folderName, e); } return result; }
2、将单个文件添加到zip文件中
////// Compress a file into a ZIP archive as the container store /// /// The file to compress /// The archive file /// override existing file ///static bool PackageFile(string fileName, string compressedFileName, bool overrideExisting) { bool result = false; if (!File.Exists(fileName)) { return result; } if (!overrideExisting && File.Exists(compressedFileName)) { return result; } try { Uri partUridocument = PackUriHelper.CreatePartUri(new Uri(Path.GetFileName(fileName), UriKind.Relative)); using (Package package = Package.Open(compressedFileName, FileMode.OpenOrCreate)) { if (package.PartExists(partUridocument)) { package.DeletePart(partUridocument); } PackagePart packagePartdocument = package.CreatePart(partUridocument, "", CompressionOption.Maximum); using (FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read)) { fileStream.CopyTo(packagePartdocument.GetStream()); } } result = true; } catch (Exception e) { throw new Exception("Error zipping file " + fileName, e); } return result; }
3、zip文件解压
////// Extract a container Zip. NOTE: container must be created as Open Packaging Conventions (OPC) specification /// /// The folder to extract the package to /// The package file /// override existing files ///static bool UncompressFile(string folderName, string compressedFileName, bool overrideExisting) { bool result = false; try { if (!File.Exists(compressedFileName)) { return result; } DirectoryInfo directoryInfo = new DirectoryInfo(folderName); if (!directoryInfo.Exists) directoryInfo.Create(); using (Package package = Package.Open(compressedFileName, FileMode.Open, FileAccess.Read)) { foreach (PackagePart packagePart in package.GetParts()) { ExtractPart(packagePart, folderName, overrideExisting); } } result = true; } catch (Exception e) { throw new Exception("Error unzipping file " + compressedFileName, e); } return result; } static void ExtractPart(PackagePart packagePart, string targetDirectory, bool overrideExisting) { string stringPart = targetDirectory + HttpUtility.UrlDecode(packagePart.Uri.ToString()).Replace('\', '/'); if (!Directory.Exists(Path.GetDirectoryName(stringPart))) Directory.CreateDirectory(Path.GetDirectoryName(stringPart)); if (!overrideExisting && File.Exists(stringPart)) return; using (FileStream fileStream = new FileStream(stringPart, FileMode.Create)) { packagePart.GetStream().CopyTo(fileStream); } }
使用Package压缩文件会在zip文件自动生成[Content_Type].xml，用来描述zip文件解压支持的文件格式。
同样，如果zip文件不包含[Content_Type].xml文件，或者[Content_Type].xml文件不包含所对应扩展名的描述（手动添加的[Content_Type].xml也是可以），将无法解压文件。
二、使用第三方类库
zip的压缩和解压使用比较的有SharpZipLib和DotNetZip。
1、SharpZipLib，也称为“#ziplib”，基于GPL开源，支持Zip，GZip，Tar和BZip2的压缩和解压缩。
支持.NET 1.1,NET 2.0（3.5、4.0）.
（1）zip压缩
public static void Zip(string SrcFile, string DstFile, int BufferSize)
{
FileStream fileStreamIn = new FileStream
(SrcFile, FileMode.Open, FileAccess.Read);
FileStream fileStreamOut = new FileStream
(DstFile, FileMode.Create, FileAccess.Write);
ZipOutputStream zipOutStream = new ZipOutputStream(fileStreamOut);
byte[] buffer = new byte
（2）解压zip
public static void UnZip(string SrcFile, string DstFile, int BufferSize)
{
FileStream fileStreamIn = new FileStream
(SrcFile, FileMode.Open, FileAccess.Read);
ZipInputStream zipInStream = new ZipInputStream(fileStreamIn);
ZipEntry entry = zipInStream.GetNextEntry();
FileStream fileStreamOut = new FileStream
(DstFile + @"" + entry.Name, FileMode.Create, FileAccess.Write);
int size;
byte[] buffer = new byte
2、DotNetLib，是基于”WS-PL”开源，使用比较简单
(1)压缩
using (ZipFile zip = new ZipFile())
{
zip.AddFile("ReadMe.txt");
zip.AddFile("7440-N49th.png");
zip.AddFile("2008_Annual_Report.pdf");
zip.Save("Archive.zip");
}
（2）解压
private void MyExtract()
{
string zipToUnpack = "C1P3SML.zip";
string unpackDirectory = "Extracted Files";
using (ZipFile zip1 = ZipFile.Read(zipToUnpack))
{
// here, we extract every entry, but we could extract conditionally
// based on entry name, size, date, checkbox status, etc.
foreach (ZipEntry e in zip1)
{
e.Extract(unpackDirectory, ExtractExistingFileAction.OverwriteSilently);
}
}
}
三、在.NET 4.5使用ZipArchive、ZipFile等类压缩和解压
static void Main(string[] args)
{
string ZipPath = @"c:usersexampleuserstart.zip";
string ExtractPath = @"c:usersexampleuserextract";
string NewFile = @"c:usersexampleuserNewFile.txt";
using (ZipArchive Archive = ZipFile.Open(ZipPath, ZipArchiveMode.Update))
{
Archive.CreateEntryFromFile(NewFile, "NewEntry.txt");
Archive.ExtractToDirectory(ExtractPath);
}
}
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