C#實現Zip壓縮解壓實例

本文只列舉一個壓縮幫助類，使用的是有要添加一個dll引用ICSharpCode.SharpZipLib.dll【下載地址】。

這個類壓縮格式是ZIP的，文件後綴寫成 .zip。若是用這個類來解壓rar格式的壓縮文件時會報錯。

 

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 ZipTest
{
    /// <summary>   
    /// 適用與ZIP壓縮   
    /// </summary>   
    public class ZipHelper
    {
        #region 壓縮

        /// <summary>   
        /// 遞歸壓縮文件夾的內部方法   
        /// </summary>   
        /// <param name="folderToZip">要壓縮的文件夾路徑</param>   
        /// <param name="zipStream">壓縮輸出流</param>   
        /// <param name="parentFolderName">此文件夾的上級文件夾</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>   
        /// 壓縮文件夾    
        /// </summary>   
        /// <param name="folderToZip">要壓縮的文件夾路徑</param>   
        /// <param name="zipedFile">壓縮文件完整路徑</param>   
        /// <param name="password">密碼</param>   
        /// <returns>是否壓縮成功</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>   
        /// 壓縮文件夾   
        /// </summary>   
        /// <param name="folderToZip">要壓縮的文件夾路徑</param>   
        /// <param name="zipedFile">壓縮文件完整路徑</param>   
        /// <returns>是否壓縮成功</returns>   
        public static bool ZipDirectory(string folderToZip, string zipedFile)
        {
            bool result = ZipDirectory(folderToZip, zipedFile, null);
            return result;
        }

        /// <summary>   
        /// 壓縮文件   
        /// </summary>   
        /// <param name="fileToZip">要壓縮的文件全名</param>   
        /// <param name="zipedFile">壓縮後的文件名</param>   
        /// <param name="password">密碼</param>   
        /// <returns>壓縮結果</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>   
        /// 壓縮文件   
        /// </summary>   
        /// <param name="fileToZip">要壓縮的文件全名</param>   
        /// <param name="zipedFile">壓縮後的文件名</param>   
        /// <returns>壓縮結果</returns>   
        public static bool ZipFile(string fileToZip, string zipedFile)
        {
            bool result = ZipFile(fileToZip, zipedFile, null);
            return result;
        }

        /// <summary>   
        /// 壓縮文件或文件夾   
        /// </summary>   
        /// <param name="fileToZip">要壓縮的路徑</param>   
        /// <param name="zipedFile">壓縮後的文件名</param>   
        /// <param name="password">密碼</param>   
        /// <returns>壓縮結果</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>   
        /// 壓縮文件或文件夾   
        /// </summary>   
        /// <param name="fileToZip">要壓縮的路徑</param>   
        /// <param name="zipedFile">壓縮後的文件名</param>   
        /// <returns>壓縮結果</returns>   
        public static bool Zip(string fileToZip, string zipedFile)
        {
            bool result = Zip(fileToZip, zipedFile, null);
            return result;

        }

        #endregion

        #region 解壓

        /// <summary>   
        /// 解壓功能(解壓壓縮文件到指定目錄)   
        /// </summary>   
        /// <param name="fileToUnZip">待解壓的文件</param>   
        /// <param name="zipedFolder">指定解壓目標目錄</param>   
        /// <param name="password">密碼</param>   
        /// <returns>解壓結果</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   

                        int index = ent.Name.LastIndexOf('/');
                        if (index != -1 || fileName.EndsWith("\\"))
                        {
                            string tmpDir = (index != -1 ? fileName.Substring(0, fileName.LastIndexOf('\\')) : fileName) + "\\";
                            if (!Directory.Exists(tmpDir))
                            {
                                Directory.CreateDirectory(tmpDir);
                            }
                            if (tmpDir == fileName)
                            {
                                continue;
                            }
                        }

                        fs = File.Create(fileName);
                        int size = 2048;
                        byte[] data = new byte[size];
                        while (true)
                        {
                            size = zipStream.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>   
        /// 解壓功能(解壓壓縮文件到指定目錄)   
        /// </summary>   
        /// <param name="fileToUnZip">待解壓的文件</param>   
        /// <param name="zipedFolder">指定解壓目標目錄</param>   
        /// <returns>解壓結果</returns>   
        public static bool UnZip(string fileToUnZip, string zipedFolder)
        {
            bool result = UnZip(fileToUnZip, zipedFolder, null);
            return result;
        }

        #endregion
    }
}

View Code

 

這個不一樣於以前用的zip壓縮類，壓縮後文件不會亂碼。

補充：UnZip方法修復，解決壓縮包內包含文件夾，可能沒有優先建立文件夾，從而報錯【未能找到路徑「」的一部分。】