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C#使用ICSharpCode.SharpZipLib压缩文件 
http://blog.csdn.net/venus0314/archive/2006/09/25/1280610.aspx

引用   ICSharpCode.SharpZipLib
public static byte[] Compress(byte[] data)
        {
            MemoryStream ms = new MemoryStream();
            GZipStream stream = new GZipStream(ms, CompressionMode.Compress);
            stream.Write(data, 0, data.Length);
            stream.Close();
            return ms.ToArray();
        }        public static byte[] Decompress(byte[] data)
        {
            MemoryStream ms = new MemoryStream();
            ms.Write(data, 0, data.Length);
            ms.Position = 0;
            GZipStream stream = new GZipStream(ms, CompressionMode.Decompress);
            MemoryStream temp = new MemoryStream();
            byte[] buffer = new byte[1];
            while (true)
            {
                int read = stream.Read(buffer, 0, buffer.Length);
                if (read <= 0)
                {
                    break;
                }
                else
                {
                    temp.Write(buffer, 0, buffer.Length);
                }
            }
            stream.Close();
            return temp.ToArray();
        }

不论zip文件里有多少文件和文件夹，我都能解压缩
/// <summary>
    /// 解压缩文件
    /// </summary>
    /// <param name="TargetFile">待解压的文件</param>
    /// <param name="fileDir">解压出来的文件保存的路径</param>
    /// <param name="ErrorMessage"></param>
    /// <returns></returns>
    public string unZipFile(string TargetFile, string fileDir)
    {
        string rootFile = "";
        try
        {
            //读取压缩文件(zip文件)，准备解压缩
            ZipInputStream s = new ZipInputStream(File.OpenRead(TargetFile.Trim()));
            ZipEntry theEntry;
            string path = fileDir;          //解压出来的文件保存的路径            string rootDir = "";            //根目录下的第一个子文件夹的名称
            while ((theEntry = s.GetNextEntry()) != null)
            {
                rootDir = Path.GetDirectoryName(theEntry.Name);             //得到根目录下的第一级子文件夹的名称
                if (rootDir.IndexOf("\\") >= 0)
                {
                    rootDir = rootDir.Substring(0, rootDir.IndexOf("\\") + 1);
                }
                string dir = Path.GetDirectoryName(theEntry.Name);          //根目录下的第一级子文件夹的下的文件夹的名称
                string fileName = Path.GetFileName(theEntry.Name);          //根目录下的文件名称
                if (dir != "" && fileName == "")                            //创建根目录下的子文件夹,不限制级别
                {
                    if (!Directory.Exists(fileDir + "\\" + dir))
                    {
                        path = fileDir + "\\" + dir;                        //在指定的路径创建文件夹
                        Directory.CreateDirectory(path);
                    }
                }
                else if (dir == "" && fileName != "")                       //根目录下的文件
                {
                    path = fileDir;
                    rootFile = fileName;
                }
                else if (dir != "" && fileName != "")                       //根目录下的第一级子文件夹下的文件
                {
                    if (dir.IndexOf("\\") > 0)                              //指定文件保存的路径
                    {
                        path = fileDir + "\\" + dir;
                    }
                }                if (dir == rootDir)                                         //判断是不是需要保存在根目录下的文件
                {
                    path = fileDir + "\\" + rootDir;
                }                //以下为解压缩zip文件的基本步骤
                //基本思路就是遍历压缩文件里的所有文件，创建一个相同的文件。
                if (fileName != String.Empty)
                {
                    FileStream streamWriter = File.Create(path + "\\" + fileName);                    int size = 2048;
                    byte[] data = new byte[2048];
                    while (true)
                    {
                        size = s.Read(data, 0, data.Length);
                        if (size > 0)
                        {
                            streamWriter.Write(data, 0, size);
                        }
                        else
                        {
                            break;
                        }
                    }                    streamWriter.Close();
                }
            }
            s.Close();            return rootFile;
        }
        catch (Exception ex)
        {
            return "1;" + ex.Message;
        }
    }