C# 解壓zip壓縮文件

此方法需要在程序內引用ICSharpCode.SharpZipLib.dll 類庫

/// <summary>
        /// 功能：解壓zip格式的文件。
        /// </summary>
        /// <param name="zipFilePath">壓縮文件路徑</param>
        /// <param name="unZipDir">解壓文件存放路徑,為空時默認與壓縮文件同一級目錄下，跟壓縮文件同名的文件夾</param>
        /// <param name="err">出錯信息</param>
        /// <returns>解壓是否成功</returns>
        public bool UnZipFile(string zipFilePath, string unZipDir)// , out string err
        {
            // err = "";
            if (zipFilePath == string.Empty)
            {
                //err = "壓縮文件不能為空！";
                return false;
            }
            if (!File.Exists(zipFilePath))
            {
                //err = "壓縮文件不存在！";
                return false;
            }
            //解壓文件夾為空時默認與壓縮文件同一級目錄下，跟壓縮文件同名的文件夾
            if (unZipDir == string.Empty)
                unZipDir = zipFilePath.Replace(Path.GetFileName(zipFilePath), Path.GetFileNameWithoutExtension(zipFilePath));
            if (!unZipDir.EndsWith("\"))
                unZipDir += "\";
            if (!Directory.Exists(unZipDir))
                Directory.CreateDirectory(unZipDir);

        try
        {
            using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipFilePath.ToLower())))
            {

                ZipEntry theEntry;
                while ((theEntry = s.GetNextEntry()) != null)
                {
                    string directoryName = Path.GetDirectoryName(theEntry.Name);
                    string fileName = Path.GetFileName(theEntry.Name);
                    if (directoryName.Length > 0)
                    {
                        Directory.CreateDirectory(unZipDir + directoryName);
                    }
                    if (!directoryName.EndsWith("\\"))
                        directoryName += "\\";
                    if (fileName != String.Empty)
                    {
                        using (FileStream streamWriter = File.Create(unZipDir + theEntry.Name))
                        {

                            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;
                                }
                            }
                        }
                    }
                }//while
            }
        }
        catch (Exception ex)
        {
            //err = ex.Message;
            return false;
        }
        return true;
    }//解壓結束</pre><br />