C# zip/unzip with ICSharpCode.SharpZipLib

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using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;
using System.Diagnostics;
using ICSharpCode.SharpZipLib.Core;

namespace SKPaySlip
{

    public class ZipHelper
    {

        public static void CreateZipFile(string filesPath, string zipFilePath)
        {

            if (!Directory.Exists(filesPath))
            {
                Console.WriteLine("Cannot find directory '{0}'", filesPath);
                return;
            }

            try
            {
                string[] filenames = Directory.GetFiles(filesPath);
                using (ZipOutputStream s = new ZipOutputStream(File.Create(zipFilePath)))
                {
                    s.SetLevel(); // 压缩级别 0-9
                    //s.Password = "123"; //Zip压缩文件密码
                    byte[] buffer = new byte[]; //缓冲区大小
                    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, , buffer.Length);
                                s.Write(buffer, , sourceBytes);
                            } while (sourceBytes > );
                        }
                    }
                    s.Finish();
                    s.Close();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception during processing {0}", ex);
            }
        }

        public static void UnZipFile(string zipFilePath, string outDir)
        {
            if (string.IsNullOrEmpty(outDir))
            {
                outDir = "";
            }
            else
            {
                if (!outDir.EndsWith(@"\"))
                {
                    outDir = outDir + @"\";
                }
            }
            if (!File.Exists(zipFilePath))
            {

                Console.WriteLine("Cannot find file '{0}'", zipFilePath);
                return;
            }

            using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipFilePath)))
            {
                ZipEntry theEntry;
                while ((theEntry = s.GetNextEntry()) != null)
                {
                    Console.WriteLine(theEntry.Name);
                    string directoryName = Path.GetDirectoryName(theEntry.Name);
                    string fileName = Path.GetFileName(theEntry.Name);
                    // create directory
                    if (directoryName.Length > )
                    {
                        Directory.CreateDirectory(directoryName);
                    }
                    if (fileName != String.Empty)
                    {

                        using (FileStream streamWriter = File.Create(outDir + theEntry.Name))
                        {
                            int size = ;
                            byte[] data = new byte[];
                            while (true)
                            {
                                size = s.Read(data, , data.Length);
                                if (size > )
                                {
                                    streamWriter.Write(data, , size);
                                }
                                else
                                {
                                    break;
                                }
                            }
                        }
                    }
                }
            }
        }

    }

}