ZipHelper

本文只列举一个压缩帮助类，使用的是有要添加一个dll引用ICSharpCode.SharpZipLib.dll。另外说明一下的是，这个类压缩格式是ZIP的，所以文件的后缀写成 .zip

还有，如果用这个类来解压rar格式的压缩文件时会报错，就网上说的那个"Wrong Local header signature: 0x21726152"异常。只要解压ZIP压缩格式的压缩文件就不会报错了。 下面就是Helper类的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using ICSharpCode.SharpZipLib;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Checksums;

namespace MyHelpers.Helpers
{
    /// <summary>
    /// 适用与ZIP压缩
    /// </summary>
    public class ZipHelper
    {
        #region 压缩

        /// <summary>
        /// 递归压缩文件夹的内部方法
        /// </summary>
        /// <param name="folderToZip">要压缩的文件夹路径</param>
        /// <param name="zipStream">压缩输出流</param>
        /// <param name="parentFolderName">此文件夹的上级文件夹</param>
        /// <returns></returns>
        private static bool ZipDirectory(string folderToZip, ZipOutputStream zipStream, string parentFolderName)
        {
            bool result = true;
            string [] folders, files;
            ZipEntry ent = null;
            FileStream fs = null;
            Crc32 crc = new Crc32();

            try
            {
                ent = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/"));
                zipStream.PutNextEntry(ent);
                zipStream.Flush();

                files = Directory.GetFiles(folderToZip);
                foreach (string file in files)
                {
                    fs = File.OpenRead(file);

                    byte[] buffer = new byte[fs.Length];
                    fs.Read(buffer, 0, buffer.Length);
                    ent = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/" + Path.GetFileName(file)));
                    ent.DateTime = DateTime.Now;
                    ent.Size = fs.Length;

                    fs.Close();

                    crc.Reset();
                    crc.Update(buffer);

                    ent.Crc = crc.Value;
                    zipStream.PutNextEntry(ent);
                    zipStream.Write(buffer, 0, buffer.Length);
                }

            }
            catch
            {
                result = false;
            }
            finally
            {
                if (fs != null)
                {
                    fs.Close();
                    fs.Dispose();
                }
                if (ent != null)
                {
                    ent = null;
                }
                GC.Collect();
                GC.Collect(1);
            }

            folders = Directory.GetDirectories(folderToZip);
            foreach (string folder in folders)
                if (!ZipDirectory(folder, zipStream, folderToZip))
                    return false;

            return result;
        }

        /// <summary>
        /// 压缩文件夹 
        /// </summary>
        /// <param name="folderToZip">要压缩的文件夹路径</param>
        /// <param name="zipedFile">压缩文件完整路径</param>
        /// <param name="password">密码</param>
        /// <returns>是否压缩成功</returns>
        public static bool ZipDirectory(string folderToZip, string zipedFile, string password)
        {
            bool result = false;
            if (!Directory.Exists(folderToZip))
                return result;

            ZipOutputStream zipStream = new ZipOutputStream(File.Create(zipedFile));
            zipStream.SetLevel(6);
            if (!string.IsNullOrEmpty(password)) zipStream.Password = password;

            result = ZipDirectory(folderToZip, zipStream, "");

            zipStream.Finish();
            zipStream.Close();

            return result;
        }

        /// <summary>
        /// 压缩文件夹
        /// </summary>
        /// <param name="folderToZip">要压缩的文件夹路径</param>
        /// <param name="zipedFile">压缩文件完整路径</param>
        /// <returns>是否压缩成功</returns>
        public static bool ZipDirectory(string folderToZip, string zipedFile)
        {
            bool result = ZipDirectory(folderToZip, zipedFile, null);
            return result;
        }

        /// <summary>
        /// 压缩文件
        /// </summary>
        /// <param name="fileToZip">要压缩的文件全名</param>
        /// <param name="zipedFile">压缩后的文件名</param>
        /// <param name="password">密码</param>
        /// <returns>压缩结果</returns>
        public static bool ZipFile(string fileToZip, string zipedFile, string password)
        {
            bool result = true;
            ZipOutputStream zipStream=null;
            FileStream fs = null;
            ZipEntry ent = null;

            if (!File.Exists(fileToZip))
                return false;

            try
            {
                fs = File.OpenRead(fileToZip);
                byte[] buffer = new byte[fs.Length];
                fs.Read(buffer, 0, buffer.Length);
                fs.Close();

                fs = File.Create(zipedFile);
                zipStream = new ZipOutputStream(fs);
                if (!string.IsNullOrEmpty(password)) zipStream.Password = password;
                ent = new ZipEntry(Path.GetFileName(fileToZip));
                zipStream.PutNextEntry(ent);
                zipStream.SetLevel(6);

                zipStream.Write(buffer, 0, buffer.Length);

            }
            catch
            {
                result = false;
            }
            finally
            {
                if (zipStream != null)
                {
                    zipStream.Finish();
                    zipStream.Close();
                }
                if (ent != null)
                {
                    ent = null;
                }
                if (fs != null)
                {
                    fs.Close();
                    fs.Dispose();
                }
            }
            GC.Collect();
            GC.Collect(1);

            return result;
        }

        /// <summary>
        /// 压缩文件
        /// </summary>
        /// <param name="fileToZip">要压缩的文件全名</param>
        /// <param name="zipedFile">压缩后的文件名</param>
        /// <returns>压缩结果</returns>
        public static bool ZipFile(string fileToZip, string zipedFile)
        {
            bool result = ZipFile(fileToZip, zipedFile,null);
            return result;
        }

        /// <summary>
        /// 压缩文件或文件夹
        /// </summary>
        /// <param name="fileToZip">要压缩的路径</param>
        /// <param name="zipedFile">压缩后的文件名</param>
        /// <param name="password">密码</param>
        /// <returns>压缩结果</returns>
        public static bool Zip(string fileToZip, string zipedFile, string password)
        {
            bool result = false;
            if (Directory.Exists(fileToZip))
                result = ZipDirectory(fileToZip, zipedFile, password);
            else if (File.Exists(fileToZip))
                result = ZipFile(fileToZip, zipedFile,password);

            return result;
        }

        /// <summary>
        /// 压缩文件或文件夹
        /// </summary>
        /// <param name="fileToZip">要压缩的路径</param>
        /// <param name="zipedFile">压缩后的文件名</param>
        /// <returns>压缩结果</returns>
        public static bool Zip(string fileToZip, string zipedFile)
        {
            bool result = Zip(fileToZip, zipedFile,null);
            return result;

        }

        #endregion

        #region 解压

        /// <summary>
        /// 解压功能(解压压缩文件到指定目录)
        /// </summary>
        /// <param name="fileToUnZip">待解压的文件</param>
        /// <param name="zipedFolder">指定解压目标目录</param>
        /// <param name="password">密码</param>
        /// <returns>解压结果</returns>
        public static bool UnZip(string fileToUnZip, string zipedFolder, string password)
        {
            bool result = true;
            FileStream fs = null;
            ZipInputStream zipStream = null;
            ZipEntry ent = null;
            string fileName;

            if (!File.Exists(fileToUnZip))
                return false;

            if (!Directory.Exists(zipedFolder))
                Directory.CreateDirectory(zipedFolder);

            try
            {
                zipStream=new ZipInputStream(File.OpenRead(fileToUnZip));
                if(!string.IsNullOrEmpty(password))zipStream.Password=password;
                while ((ent=zipStream.GetNextEntry())!=null)
                {
                    if (!string.IsNullOrEmpty(ent.Name))
                    {
                        fileName = Path.Combine(zipedFolder, ent.Name);
                        fileName = fileName.Replace('/', '\\');//change by Mr.HopeGi

                        if (fileName.EndsWith("\\"))
                        {
                            Directory.CreateDirectory(fileName);
                            continue;
                        }

                        fs = File.Create(fileName);
                        int size = 2048;
                        byte[] data = new byte[size];
                        while (true)
                        {
                            size = fs.Read(data, 0, data.Length);
                            if (size > 0)
                                fs.Write(data, 0, data.Length);
                            else
                                break;
                        }
                    }
                }
            }
            catch
            {
                result = false;
            }
            finally
            {
                if (fs != null)
                {
                    fs.Close();
                    fs.Dispose();
                }
                if (zipStream != null)
                {
                    zipStream.Close();
                    zipStream.Dispose();
                }
                if(ent!=null)
                {
                    ent = null;
                }
                GC.Collect();
                GC.Collect(1);
            }
            return result;
        }

        /// <summary>
        /// 解压功能(解压压缩文件到指定目录)
        /// </summary>
        /// <param name="fileToUnZip">待解压的文件</param>
        /// <param name="zipedFolder">指定解压目标目录</param>
        /// <returns>解压结果</returns>
        public static bool UnZip(string fileToUnZip, string zipedFolder)
        {
            bool result = UnZip(fileToUnZip, zipedFolder,null);
            return result;
        }

        #endregion
    }
}