C#实现文件夹压缩到zip以及解压

需要用到SharpLibZip。代码如下：

Zip.cs

    public class Zip
    {
        /// <summary>
        /// 压缩文件夹
        /// </summary>
        /// <param name="dirPath">压缩文件夹的路径</param>
        /// <param name="fileName">生成的zip文件路径</param>
        /// <param name="level">压缩级别 0 - 9 0是存储级别 9是最大压缩</param>
        /// <param name="bufferSize">读取文件的缓冲区大小</param>
        public void CompressDirectory(string dirPath,string fileName,int level,int bufferSize)
        {
            byte[] buffer = new byte[bufferSize];
            using (ZipOutputStream s = new ZipOutputStream(File.Create(fileName)))
            {
                s.SetLevel(level);
                CompressDirectory(dirPath, dirPath, s, buffer);
                s.Finish();
                s.Close();
            }
        }

        /// <summary>
        /// 压缩文件夹
        /// </summary>
        /// <param name="root">压缩文件夹路径</param>
        /// <param name="path">压缩文件夹内当前要压缩的文件夹路径</param>
        /// <param name="s"></param>
        //