c# 第三方解壓sharpziplib

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ICSharpCode.SharpZipLib.Zip;  //開源工具using System.IO; 

namespace Package
{
    class Class1
    {
        #region 加壓解壓方法
        /// <summary>   
        /// 功能：壓縮文件（暫時只壓縮文件夾下一級目錄中的文件，文件夾及其子級被忽略）   
        /// </summary>   
        /// <param name="dirPath">被壓縮的文件夾夾路徑</param>   
        /// <param name="zipFilePath">生成壓縮文件的路徑，爲空則默認與被壓縮文件夾同一級目錄，名稱爲：文件夾名+.zip</param>   
        /// <param name="err">出錯信息</param>   
        /// <returns>是否壓縮成功</returns>   
        public bool ZipFile(string dirPath, string zipFilePath, out string err)
        {
            err = "";
            if (dirPath == string.Empty)
            {
                err = "要壓縮的文件夾不能爲空！";
                return false;
            }
            if (!Directory.Exists(dirPath))
            {
                err = "要壓縮的文件夾不存在！";
                return false;
            }
            //壓縮文件名爲空時使用文件夾名＋.zip   
            if (zipFilePath == string.Empty)
            {
                if (dirPath.EndsWith("\\"))
                {
                    dirPath = dirPath.Substring(0, dirPath.Length - 1);
                }
                zipFilePath = dirPath + ".zip";
            }

            try
            {
                string[] filenames = Directory.GetFiles(dirPath);
                using (ZipOutputStream s = new ZipOutputStream(File.Create(zipFilePath)))
                {
                    s.SetLevel(9);
                    byte[] buffer = new byte[4096];
                    foreach (string file in filenames)
                    {
                        ZipEntry entry = new ZipEntry(Path.GetFileName(file));
                        entry.DateTime = DateTime.Now;
                        s.PutNextEntry(entry);
                        using (FileStream fs = File.OpenRead(file))
                        {
                            int sourceBytes;
                            do
                            {
                                sourceBytes = fs.Read(buffer, 0, buffer.Length);
                                s.Write(buffer, 0, sourceBytes);
                            } while (sourceBytes > 0);
                        }
                    }
                    s.Finish();
                    s.Close();
                }
            }
            catch (Exception ex)
            {
                err = ex.Message;
                return false;
            }
            return true;
        }

        /// <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,爲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 = "壓縮文件不能爲空！";
                return false;
            }
            if (!File.Exists(zipFilePath))
            {
                err = "壓縮文件不存在！";
                return false;
            }
            //解壓文件夾爲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)))
                {

                    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  
        #endregion


    }
}

 附：實例地址：http://download.csdn.net/detail/json1204/4381944