C#使用ICSharpCode.SharpZipLib.dll進行文件的壓縮與解壓

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

namespace zip壓縮與解壓
{
    public class ZipHelper
    {
        /// <summary>
        /// 壓縮單個文件
        /// </summary>
        /// <param name="fileToZip">需壓縮的文件名</param>
        /// <param name="zipFile">壓縮后的文件名（文件名都是絕對路徑）</param>
        /// <param name="level">壓縮等級（0-9）</param>
        /// <param name="password">壓縮密碼（解壓是需要的密碼）</param>
        public static void ZipFile(string fileToZip, string zipFile, int level = 5, string password = "123")
        {
            if (!File.Exists(fileToZip))
                throw new FileNotFoundException("壓縮文件" + fileToZip + "不存在");

            using (FileStream fs = File.OpenRead(fileToZip))
            {
                fs.Position = 0;//設置流的起始位置
                byte[] buffer = new byte[(int)fs.Length];
                fs.Read(buffer, 0, buffer.Length);//讀取的時候設置Position，寫入的時候不需要設置
                fs.Close();
                using (FileStream zfstram = File.Create(zipFile))
                {
                    using (ZipOutputStream zipstream = new ZipOutputStream(zfstram))
                    {
                        zipstream.Password = md5(password);//設置屬性的時候在PutNextEntry函數之前
                        zipstream.SetLevel(level);
                        string fileName = fileToZip.Substring(fileToZip.LastIndexOf('\\') + 1);
                        ZipEntry entry = new ZipEntry(fileName);
                        zipstream.PutNextEntry(entry);
                        zipstream.Write(buffer, 0, buffer.Length);
                    }
                }

            }
        }

        /// <summary>
        /// 壓縮多個文件目錄
        /// </summary>
        /// <param name="dirname">需要壓縮的目錄</param>
        /// <param name="zipFile">壓縮后的文件名</param>
        /// <param name="level">壓縮等級</param>
        /// <param name="password">密碼</param>
        public static void ZipDir(string dirname, string zipFile, int level = 5, string password = "123")
        {
            ZipOutputStream zos = new ZipOutputStream(File.Create(zipFile));
            zos.Password = md5(password);
            zos.SetLevel(level);
            addZipEntry(dirname, zos, dirname);
            zos.Finish();
            zos.Close();

        }
        /// <summary>
        /// 往壓縮文件里面添加Entry
        /// </summary>
        /// <param name="PathStr">文件路徑</param>
        /// <param name="zos">ZipOutputStream</param>
        /// <param name="BaseDirName">基礎目錄</param>
        private static void addZipEntry(string PathStr, ZipOutputStream zos, string BaseDirName)
        {
            DirectoryInfo dir = new DirectoryInfo(PathStr);
            foreach (FileSystemInfo item in dir.GetFileSystemInfos())
            {
                if ((item.Attributes & FileAttributes.Directory) == FileAttributes.Directory)//如果是文件夾繼續遞歸
                {
                    addZipEntry(item.FullName, zos, BaseDirName);
                }
                else
                {
                    FileInfo f_item = (FileInfo)item;
                    using (FileStream fs = f_item.OpenRead())
                    {
                        byte[] buffer = new byte[(int)fs.Length];
                        fs.Position = 0;
                        fs.Read(buffer, 0, buffer.Length);
                        fs.Close();
                        ZipEntry z_entry = new ZipEntry(item.FullName.Replace(BaseDirName, ""));
                        zos.PutNextEntry(z_entry);
                        zos.Write(buffer, 0, buffer.Length);
                    }
                }
            }


        }

        /// <summary>
        /// 解壓多個文件目錄
        /// </summary>
        /// <param name="zfile">壓縮文件絕對路徑</param>
        /// <param name="dirname">解壓文件目錄</param>
        /// <param name="password">密碼</param>
        public static void UnZip(string zfile, string dirname, string password)
        {
            if (!Directory.Exists(dirname)) Directory.CreateDirectory(dirname);

            using (ZipInputStream zis = new ZipInputStream(File.OpenRead(zfile)))
            {
                zis.Password = md5(password);
                ZipEntry entry;
                while ((entry = zis.GetNextEntry()) != null)
                {
                    var strArr = entry.Name.Split('\\');//這邊判斷壓縮文件里面是否存在目錄，存在的話先創建目錄后繼續解壓
                    if (strArr.Length > 2)        
                        Directory.CreateDirectory(dirname + @"\" + strArr[1]);
                    
                    using (FileStream dir_fs = File.Create(dirname + entry.Name))
                    {
                        int size = 1024 * 2;
                        byte[] buffer = new byte[size];
                        while (true)
                        {
                            size = zis.Read(buffer, 0, buffer.Length);
                            if (size > 0)
                                dir_fs.Write(buffer, 0, size);
                            else
                                break;
                        }
                    }
                }
            }
        }

        private static string md5(string pwd)
        {
            var res = "";
            MD5 md = MD5.Create();
            byte[] s = md.ComputeHash(Encoding.Default.GetBytes(pwd));
            for (int i = 0; i < s.Length; i++)
                res = res + s[i].ToString("X");

            return res;
        }
    }
}

調用函數如下:

  static void Main(string[] args)
        {

            var str = @"\學籍導入模板.xls";
            //var arr=str.Split('\\');

            var filePath = @"D:\程序文件\VS2010學習\StudyProgram\zip壓縮與解壓\File\學籍導入模板.xls";
            //ZipHelper.ZipFile(filePath, @"D:\程序文件\VS2010學習\StudyProgram\zip壓縮與解壓\File\test.zip", 6, "123");
            var dirPath = @"D:\程序文件\VS2010學習\StudyProgram\zip壓縮與解壓";
            //ZipHelper.ZipDir(dirPath + @"\File", dirPath + @"\File.zip", 6, "huage");

            ZipHelper.UnZip(dirPath + @"\File.zip", dirPath + @"\test", "huage");

            Console.ReadKey();
        }

效果圖如下：