c#自带的System.IO.Compression命名空间下的压缩类实现的多文件压缩和解压功能，缺点是多文件压缩包的解压只能调用自身的解压方法，和现有的压缩软件不兼容。下面的代码没有把多文件的目录结构加进去

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;namespace Test.Zip
{class CompressHelper{/// <summary>/// 单文件压缩（生成的压缩包和第三方的解压软件兼容）/// </summary>/// <param name="sourceFilePath"></param>/// <returns></returns>public string CompressSingle(string sourceFilePath){string zipFileName = sourceFilePath + ".gz";using (FileStream sourceFileStream = new FileInfo(sourceFilePath).OpenRead()){using (FileStream zipFileStream = File.Create(zipFileName)){using (GZipStream zipStream = new GZipStream(zipFileStream, CompressionMode.Compress)){sourceFileStream.CopyTo(zipStream);}}}return zipFileName;}/// <summary>/// 自定义多文件压缩（生成的压缩包和第三方的压缩文件解压不兼容）/// </summary>/// <param name="sourceFileList">文件列表</param>/// <param name="saveFullPath">压缩包全路径</param>public void CompressMulti(string[] sourceFileList, string saveFullPath){MemoryStream ms = new MemoryStream();foreach (string filePath in sourceFileList){Console.WriteLine(filePath);if (File.Exists(filePath)){string fileName = Path.GetFileName(filePath);byte[] fileNameBytes = System.Text.Encoding.UTF8.GetBytes(fileName);byte[] sizeBytes = BitConverter.GetBytes(fileNameBytes.Length);ms.Write(sizeBytes, 0, sizeBytes.Length);ms.Write(fileNameBytes, 0, fileNameBytes.Length);byte[] fileContentBytes = System.IO.File.ReadAllBytes(filePath);ms.Write(BitConverter.GetBytes(fileContentBytes.Length), 0, 4);ms.Write(fileContentBytes, 0, fileContentBytes.Length);}}ms.Flush();ms.Position = 0;using (FileStream zipFileStream = File.Create(saveFullPath)){using (GZipStream zipStream = new GZipStream(zipFileStream, CompressionMode.Compress)){ms.Position = 0;ms.CopyTo(zipStream);}}ms.Close();}/// <summary>/// 多文件压缩解压/// </summary>/// <param name="zipPath">压缩文件路径</param>/// <param name="targetPath">解压目录</param>public void DeCompressMulti(string zipPath, string targetPath){byte[] fileSize = new byte[4];if (File.Exists(zipPath)){using (FileStream fStream = File.Open(zipPath, FileMode.Open)){using (MemoryStream ms = new MemoryStream()){using (GZipStream zipStream = new GZipStream(fStream, CompressionMode.Decompress)){zipStream.CopyTo(ms);}ms.Position = 0;while (ms.Position != ms.Length){ms.Read(fileSize, 0, fileSize.Length);int fileNameLength = BitConverter.ToInt32(fileSize, 0);byte[] fileNameBytes = new byte[fileNameLength];ms.Read(fileNameBytes, 0, fileNameBytes.Length);string fileName = System.Text.Encoding.UTF8.GetString(fileNameBytes);string fileFulleName = targetPath + fileName;ms.Read(fileSize, 0, 4);int fileContentLength = BitConverter.ToInt32(fileSize, 0);byte[] fileContentBytes = new byte[fileContentLength];ms.Read(fileContentBytes, 0, fileContentBytes.Length);using (FileStream childFileStream = File.Create(fileFulleName)){childFileStream.Write(fileContentBytes, 0, fileContentBytes.Length);}}}}}}}
}

调用示例：

 List<string> strList = new List<string>() { @"D:\文档\soapUI工程\Synchro-soapui-project.xml", @"D:\文档\soapUI工程\PKBSML-soapui-project.xml", @"D:\文档\soapUI工程\PKBSML-soapui-project.xml" };var zipHelper = new Test.Zip.CompressHelper();zipHelper.CompressMulti(strList.ToArray(), @"D:\wulala.gz");zipHelper.DeCompressMulti(@"D:\wulala.gz", @"D:\web\");