在.NET可以通過多種方式實現zip的壓縮和解壓：1、使用System.IO.Packaging；2、使用第三方類庫；3、通過 System.IO.Compression 命名空間中新增的ZipArchive、ZipFile等類實現。

一、使用System.IO.Packaging壓縮和解壓

Package為一個抽象類，可用于將對象組織到定義的物理格式的單個實體中，從而實現可移植性與高效訪問。ZIP 文件是Package的主物理格式。 其他Package實現可以使用其他物理格式（如 XML 文檔、數據庫或 Web 服務。與文件系統類似，在分層組織的文件夾和文件中引用Package中包含的項。雖然Package是抽象類，但Package.Open方法默認使用ZipPackage派生類。

System.IO.Packaging在WindowsBase.dll程序集下，使用時需要添加對WindowsBase的引用。

1、將整個文件夾壓縮成zip

        /// <summary>
        /// Add a folder along with its subfolders to a Package
        /// </summary>
        /// <param name="folderName">The folder to add</param>
        /// <param name="compressedFileName">The package to create</param>
        /// <param name="overrideExisting">Override exsisitng files</param>
        /// <returns></returns>
        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;
        }

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經過我改進的方法 注：當文件夾名或文件名包含空格時會亂碼，有解決辦法請賜教

        /// <summary>
        /// 壓縮文件
        /// </summary>
        /// <param name="folderName">要添加的文件夾</param>
        /// <param name="zipFilePath">生成壓縮文件的路徑，為空則默認與被壓縮文件夾同一級目錄，名稱為：文件夾名+.zip</param>
        /// <returns></returns>
        public static bool PackageFolder(string folderName, string zipFilePath)
        {
            if (folderName.EndsWith(@""))
                folderName = folderName.Remove(folderName.Length - 1);
            bool result = false;
            if (!Directory.Exists(folderName))
            {
                return result;
            }
            //壓縮文件名為空時使用文件夾名＋.zip  
            if (string.IsNullOrEmpty(zipFilePath))
            {
                if (folderName.EndsWith("\"))
                {
                    folderName = folderName.Substring(0, folderName.Length - 1);
                }
                zipFilePath = folderName + ".zip";
            }

            try
            {
                var fileList = Directory.GetFiles(folderName, "*", SearchOption.AllDirectories);

                using (Package package = Package.Open(zipFilePath, FileMode.OpenOrCreate))
                {
                    string pathInPackage;
                    foreach (string fileName in fileList)
                    {
                        pathInPackage = Path.GetDirectoryName(fileName).Replace(folderName, string.Empty) + "\" + Path.GetFileName(fileName);

                        Uri partUriDocument = PackUriHelper.CreatePartUri(new Uri(pathInPackage, UriKind.RelativeOrAbsolute));
                        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)
            {
                LogHelper.Error(e);
            }

            return result;
        }

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2、將單個文件添加到zip文件中

        /// <summary>
        /// Compress a file into a ZIP archive as the container store
        /// </summary>
        /// <param name="fileName">The file to compress</param>
        /// <param name="compressedFileName">The archive file</param>
        /// <param name="overrideExisting">override existing file</param>
        /// <returns></returns>
        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;
        }

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3、zip文件解壓

        /// <summary>
        /// Extract a container Zip. NOTE: container must be created as Open Packaging Conventions (OPC) specification
        /// </summary>
        /// <param name="folderName">The folder to extract the package to</param>
        /// <param name="compressedFileName">The package file</param>
        /// <param name="overrideExisting">override existing files</param>
        /// <returns></returns>
        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);
            }
        }

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使用Package壓縮文件會在zip文件自動生成[Content_Type].xml，用來描述zip文件解壓支持的文件格式。

<?xml version="1.0" encoding="utf-8" ?> 
<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
    <Default Extension="vsixmanifest" ContentType="text/xml" /> 
    <Default Extension="dll" ContentType="application/octet-stream" /> 
    <Default Extension="png" ContentType="application/octet-stream" /> 
    <Default Extension="txt" ContentType="text/plain" /> 
    <Default Extension="pkgdef" ContentType="text/plain" /> 
</Types>

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同樣，如果zip文件不包含[Content_Type].xml文件，或者[Content_Type].xml文件不包含所對應擴展名的描述（手動添加的[Content_Type].xml也是可以），將無法解壓文件。

二、使用第三方類庫

zip的壓縮和解壓使用比較的有SharpZipLib和DotNetZip。

1、SharpZipLib，也稱為“#ziplib”，基于GPL開源，支持Zip，GZip，Tar和BZip2的壓縮和解壓縮。

支持.NET 1.1,NET 2.0（3.5、4.0）.

（1）zip壓縮

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<buffersize />;
    ZipEntry entry = new ZipEntry(Path.GetFileName(SrcFile));
    zipOutStream.PutNextEntry(entry);
    int size;
    do
    {
        size = fileStreamIn.Read(buffer, 0, buffer.Length);
        zipOutStream.Write(buffer, 0, size);
    } while (size > 0);
    zipOutStream.Close();
    fileStreamOut.Close();
    fileStreamIn.Close();
}

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（2）解壓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<buffersize />;
    do
    {
        size = zipInStream.Read(buffer, 0, buffer.Length);
        fileStreamOut.Write(buffer, 0, size);
    } while (size > 0);
    zipInStream.Close();
    fileStreamOut.Close();
    fileStreamIn.Close();
}

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2、DotNetLib，是基于”WS-PL”開源，使用比較簡單
(1)壓縮

using (ZipFile zip = new ZipFile())
  {
    zip.AddFile("ReadMe.txt");
    zip.AddFile("7440-N49th.png");
    zip.AddFile("2008_Annual_Report.pdf");        
    zip.Save("Archive.zip");
  }

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（2）解壓

        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[BufferSize];
            do
            {
                size = zipInStream.Read(buffer, 0, buffer.Length);
                fileStreamOut.Write(buffer, 0, size);
            } while (size > 0);
            zipInStream.Close();
            fileStreamOut.Close();
            fileStreamIn.Close();
        }

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三、在.NET 4.5使用ZipArchive、ZipFile等類壓縮和解壓

        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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