using System;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            ExtractFile(@"E:\mzwu.zip", @"code/default.htm");
            ExtractFile(@"E:\mzwu.zip", "jquery-1.3.2.js", @"F:\a\b\c\d.js");
            ExtractDirectory(@"E:\mzwu.zip");
            ExtractDirectory(@"E:\mzwu.zip", @"E:\a\b\c\");

            Console.WriteLine("ok");
            Console.Read();

        }

        /// <summary>
        /// 解压单个文件
        /// </summary>
        /// <param name="zipfile"></param>
        /// <param name="sourcename"></param>
        static void ExtractFile(string zipfile, string sourcename)
        {
            ExtractFile(zipfile, sourcename, null);
        }

        /// <summary>
        /// 解压单个文件
        /// </summary>
        /// <param name="zipfile"></param>
        /// <param name="sourcename"></param>
        /// <param name="destname"></param>
        static void ExtractFile(string zipfile, string sourcename, string destname)
        {
            ZipEntry entry;
            byte[] b = new byte[1024];
            int length;

            using (ZipInputStream s = new ZipInputStream(File.Open(zipfile, FileMode.Open)))
            {
                while ((entry = s.GetNextEntry()) != null)
                {
                    if (entry.IsFile && entry.Name.ToLower().Equals(sourcename.ToLower(), StringComparison.CurrentCultureIgnoreCase))
                    {
                        if (destname == null)
                            destname = zipfile.Replace(Path.GetFileName(zipfile), Path.GetFileName(entry.Name));

                        if(!Directory.Exists(Path.GetDirectoryName(destname)))
                            Directory.CreateDirectory(Path.GetDirectoryName(destname));

                        using (FileStream fs = File.Create(destname))
                        {
                            while ((length = s.Read(b, 0, b.Length)) > 0)
                            {
                                fs.Write(b, 0, length);
                            }
                        }
                        return;
                    }
                }
            }
        }

        /// <summary>
        /// 解压文件夹
        /// </summary>
        /// <param name="zipfile"></param>
        static void ExtractDirectory(string zipfile)
        {
            ExtractDirectory(zipfile, null);
        }

        /// <summary>
        /// 解压文件夹
        /// </summary>
        /// <param name="zipfile"></param>
        /// <param name="destpath"></param>
        static void ExtractDirectory(string zipfile, string destpath)
        {
            ZipEntry entry;
            string str;
            byte[] b = new byte[1024];
            int length;

            if (destpath == null)
                destpath = zipfile.Replace(Path.GetExtension(zipfile), "");

            using (ZipInputStream s = new ZipInputStream(File.Open(zipfile, FileMode.Open)))
            {
                while ((entry = s.GetNextEntry()) != null)
                {
                    str = Path.Combine(destpath, entry.Name);

                    if (entry.IsDirectory)
                    {
                        Directory.CreateDirectory(str);
                    }
                    else if (entry.IsFile)
                    {
                        Directory.CreateDirectory(Path.GetDirectoryName(str));
                        using (FileStream fs = File.Create(str))
                        {
                            while ((length = s.Read(b, 0, b.Length)) > 0)
                            {
                                fs.Write(b, 0, length);
                            }
                        }
                    }
                }
            }
        }

    }
}