C# 解压缩文件帮助类

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代码如下图：
/// <summary>    /// 压缩、解压缩文件类    /// </summary>    public class ZipHelper    {        /// <summary>        /// 压缩        /// </summary>        /// <param name="sourcepath">要压缩的文件或者文件夹(绝对路径)</param>        /// <param name="destpath">压缩后zip文件的路径(绝对路径)</param>        /// <param name="level">压缩级别0~9，数字越大压缩率越高，默认为5</param>        /// <param name="zipcontent">压缩文件夹时，只压缩文件夹内文件是否，如果为true,说明只是压缩文件夹内的文件，如果是false,则压缩出来的zip文件，包含该文件夹</param>        /// <returns></returns>        public static bool CompressionZip(string sourcepath, string destpath, int level = 5, bool zipcontent = true)        {            bool result = false;            FileStream fs = null;            try            {                sourcepath = sourcepath.Replace("/", "\\");                destpath = destpath.Replace("/", "\\");                                ZipOutputStream outputstream = new ZipOutputStream(File.Create(destpath));//压缩                outputstream.SetLevel(level); //设置压缩的等级                if (Directory.Exists(sourcepath))                {                    ZipFolder(sourcepath, outputstream, sourcepath, zipcontent);                }                else if (File.Exists(sourcepath))                {                    fs = File.OpenRead(sourcepath);                    byte[] buffer = new byte[fs.Length];                    fs.Read(buffer, 0, buffer.Length);                    string filename = new FileInfo(sourcepath).Name;                    ZipEntry entry = new ZipEntry(filename);                    outputstream.PutNextEntry(entry);//为压缩文件流提供一个容器                    outputstream.Write(buffer, 0, buffer.Length);//写入字节                }                outputstream.Finish(); //结束压缩                outputstream.Close();                fs.Close();                result = true;            }            catch (Exception ex)            {                if (fs != null)                {                    fs.Close();                }            }            return result;        }        /// <summary>        /// 压缩文件夹        /// </summary>        /// <param name="sourcefolder"></param>        /// <param name="outputstream"></param>        /// <param name="topsourcefolder"></param>        /// <param name="zipcontent"></param>        static void ZipFolder(string sourcefolder, ZipOutputStream outputstream, string topsourcefolder, bool zipcontent = true)        {            FileSystemInfo[] fileInfos = new DirectoryInfo(sourcefolder).GetFileSystemInfos();            foreach (FileSystemInfo item in fileInfos)            {                if (Directory.Exists(item.FullName))                {                    ZipFolder(item.FullName, outputstream, topsourcefolder, zipcontent);                }                else if (File.Exists(item.FullName))                {                    DirectoryInfo dirInfo = new DirectoryInfo(topsourcefolder);                    string fullname = new FileInfo(item.FullName).FullName;//获取该文件的全部路径                    string name = fullname.Substring(dirInfo.FullName.Length, fullname.Length - dirInfo.FullName.Length);//获取压缩文件相对于跟文件夹的相对路径                    string relativepath = string.Empty;                    if (zipcontent)//是否只压缩文件的内容， true,压缩文件夹内容，false,压缩文件夹                    {                        relativepath = name;                    }                    else                    {                        relativepath = string.Format("{0}{1}", dirInfo.Name, name);                    }                    FileStream fs = File.OpenRead(fullname);                    byte[] buffer = new byte[fs.Length];                    fs.Read(buffer, 0, buffer.Length);                    ZipEntry entry = new ZipEntry(relativepath);                    outputstream.PutNextEntry(entry);     //为压缩文件流提供一个容器                    outputstream.Write(buffer, 0, buffer.Length);                }            }        }        /// <summary>        /// 解压缩        /// </summary>        /// <param name="zippath">待解压缩的zip文件路径</param>        /// <param name="destfolder">解压处理的文件存放路径</param>        /// <returns></returns>        public static bool DeCompressionZip(string zippath, string destfolder)        {            bool result = false;            FileStream fs = null;            try            {                ZipInputStream inputstream = new ZipInputStream(File.OpenRead(zippath));                ZipEntry entry = inputstream.GetNextEntry(); //获取压缩文件中的每一个文件                if (!Directory.Exists(destfolder))                {                    Directory.CreateDirectory(destfolder);                }                while (entry != null)//如果解压完ze则是null                {                    if (entry.IsFile) //压缩zipINputStream里面存的都是文件。带文件夹的文件名字是文件夹\\文件名                      {                        string[] pathArr = entry.Name.Split('\\');//如果文件名包含"\\",这说明包含文件夹                        if (pathArr.Length > 1)                        {                            string path = entry.Name.Substring(0, entry.Name.LastIndexOf("\\") + 1); //创建文件夹                            Directory.CreateDirectory(Path.Combine(String.Format("{0}\\{1}", destfolder, path)));                        }                        fs = new FileStream(String.Format("{0}\\{1}", destfolder, entry.Name), FileMode.OpenOrCreate, FileAccess.ReadWrite);                        byte[] buffer = new byte[1024];                        int read = inputstream.Read(buffer, 0, buffer.Length);                        while (read > 0)                        {                            fs.Write(buffer, 0, read);                            read = inputstream.Read(buffer, 0, buffer.Length);                        }                        fs.Flush();                        fs.Close();                    }                    entry = inputstream.GetNextEntry();                }            }            catch (Exception ex)            {                if (fs != null)                {                    fs.Close();                }            }            return result;        }            }
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