c#文件压缩，需要借助外部dll文件和ZipHelper.cs

后台代码

 ZipHelper z = new ZipHelper();
        List<string> pathList=new List<string> ();
        pathList.Add("E:\\wceq\\index.aspx");
        pathList.Add("E:\\wceq\\Error.aspx");
        pathList.Add("F:\\web\\Login.aspx");
        z.ZipManyFilesOrDictorys(pathList, "E:\\wceq\\Text.zip", null);

ZipHelper.cs

using System;

using System.Collections;
using System.Collections.Generic;
using System.IO;

namespace WebApplication4
{
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;
///
/// Zip压缩帮助类
///
/// 修改纪录
///
/// 2015-09-16 版本：1.0 YangHengLian 创建主键，注意命名空间的排序。
/// 2016-5-7 YangHengLian增加了可以支持多个文件或者多个文件夹打包成一个zip文件
///
/// 版本：1.0
///
///
/// YangHengLian
/// 2015-09-16
///
///
public class ZipHelper
{
///
/// 压缩文件夹
///
///
///
/// 压缩率0（无压缩）9（压缩率最高）
public void ZipDir(string dirToZip, string zipedFileName, int compressionLevel = 9)
{
if (Path.GetExtension(zipedFileName) != “.zip”)
{
zipedFileName = zipedFileName + “.zip”;
}
using (var zipoutputstream = new ZipOutputStream(File.Create(zipedFileName)))
{
zipoutputstream.SetLevel(compressionLevel);
Crc32 crc = new Crc32();
Hashtable fileList = GetAllFies(dirToZip);
foreach (DictionaryEntry item in fileList)
{
FileStream fs = new FileStream(item.Key.ToString(), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
// ZipEntry entry = new ZipEntry(item.Key.ToString().Substring(dirToZip.Length + 1));
ZipEntry entry = new ZipEntry(Path.GetFileName(item.Key.ToString()))
{
DateTime = (DateTime) item.Value,
Size = fs.Length
};
fs.Close();
crc.Reset();
crc.Update(buffer);
entry.Crc = crc.Value;
zipoutputstream.PutNextEntry(entry);
zipoutputstream.Write(buffer, 0, buffer.Length);
}
}
}
///
/// 获取所有文件
///
///
public Hashtable GetAllFies(string dir)
{
Hashtable filesList = new Hashtable();
DirectoryInfo fileDire = new DirectoryInfo(dir);
if (!fileDire.Exists)
{
throw new FileNotFoundException(“目录:” + fileDire.FullName + “没有找到!”);
}

        GetAllDirFiles(fileDire, filesList);
        GetAllDirsFiles(fileDire.GetDirectories(), filesList);
        return filesList;
    }
    /// <summary>  
    /// 获取一个文件夹下的所有文件夹里的文件  
    /// </summary>  
    /// <param name="dirs"></param>  
    /// <param name="filesList"></param>  
    public void GetAllDirsFiles(IEnumerable<DirectoryInfo> dirs, Hashtable filesList)
    {
        foreach (DirectoryInfo dir in dirs)
        {
            foreach (FileInfo file in dir.GetFiles("*.*"))
            {
                filesList.Add(file.FullName, file.LastWriteTime);
            }
            GetAllDirsFiles(dir.GetDirectories(), filesList);
        }
    }
    /// <summary>  
    /// 获取一个文件夹下的文件  
    /// </summary>  
    /// <param name="dir">目录名称</param>
    /// <param name="filesList">文件列表HastTable</param>  
    public static void GetAllDirFiles(DirectoryInfo dir, Hashtable filesList)
    {
        foreach (FileInfo file in dir.GetFiles("*.*"))
        {
            filesList.Add(file.FullName, file.LastWriteTime);
        }
    }

    /// <summary>  
    /// 功能：解压zip格式的文件。  
    /// </summary>  
    /// <param name="zipFilePath">压缩文件路径</param>  
    /// <param name="unZipDir">解压文件存放路径,为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹</param>  
    /// <returns>解压是否成功</returns>  
    public void UnZip(string zipFilePath, string unZipDir)
    {
        if (zipFilePath == string.Empty)
        {
            throw new Exception("压缩文件不能为空！");
        }
        if (!File.Exists(zipFilePath))
        {
            throw new FileNotFoundException("压缩文件不存在！");
        }
        //解压文件夹为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹  
        if (unZipDir == string.Empty)
            unZipDir = zipFilePath.Replace(Path.GetFileName(zipFilePath), Path.GetFileNameWithoutExtension(zipFilePath));
        if (!unZipDir.EndsWith("/"))
            unZipDir += "/";
        if (!Directory.Exists(unZipDir))
            Directory.CreateDirectory(unZipDir);

        using (var s = new ZipInputStream(File.OpenRead(zipFilePath)))
        {

            ZipEntry theEntry;
            while ((theEntry = s.GetNextEntry()) != null)
            {
                string directoryName = Path.GetDirectoryName(theEntry.Name);
                string fileName = Path.GetFileName(theEntry.Name);
                if (!string.IsNullOrEmpty(directoryName))
                {
                    Directory.CreateDirectory(unZipDir + directoryName);
                }
                if (directoryName != null && !directoryName.EndsWith("/"))
                {
                }
                if (fileName != String.Empty)
                {
                    using (FileStream streamWriter = File.Create(unZipDir + theEntry.Name))
                    {

                        int size;
                        byte[] data = new byte[2048];
                        while (true)
                        {
                            size = s.Read(data, 0, data.Length);
                            if (size > 0)
                            {
                                streamWriter.Write(data, 0, size);
                            }
                            else
                            {
                                break;
                            }
                        }
                    }
                }
            }
        }
    }
    /// <summary>
    /// 压缩单个文件
    /// </summary>
    /// <param name="filePath">被压缩的文件名称(包含文件路径)，文件的全路径</param>
    /// <param name="zipedFileName">压缩后的文件名称(包含文件路径)，保存的文件名称</param>
    /// <param name="compressionLevel">压缩率0（无压缩）到 9（压缩率最高）</param>
    public void ZipFile(string filePath, string zipedFileName, int compressionLevel = 9)
    {
        // 如果文件没有找到，则报错 
        if (!File.Exists(filePath))
        {
            throw new FileNotFoundException("文件：" + filePath + "没有找到！");
        }
        // 如果压缩后名字为空就默认使用源文件名称作为压缩文件名称
        if (string.IsNullOrEmpty(zipedFileName))
        {
            string oldValue = Path.GetFileName(filePath);
            if (oldValue != null)
            {
                zipedFileName = filePath.Replace(oldValue, "") + Path.GetFileNameWithoutExtension(filePath) + ".zip";
            }
        }
        // 如果压缩后的文件名称后缀名不是zip，就是加上zip，防止是一个乱码文件
        if (Path.GetExtension(zipedFileName) != ".zip")
        {
            zipedFileName = zipedFileName + ".zip";
        }
        // 如果指定位置目录不存在，创建该目录  C:\Users\yhl\Desktop\大汉三通
        string zipedDir = zipedFileName.Substring(0, zipedFileName.LastIndexOf("\\", StringComparison.Ordinal));
        if (!Directory.Exists(zipedDir))
        {
            Directory.CreateDirectory(zipedDir);
        }
        // 被压缩文件名称
        string filename = filePath.Substring(filePath.LastIndexOf("\\", StringComparison.Ordinal) + 1);
        var streamToZip = new FileStream(filePath, FileMode.Open, FileAccess.Read);
        var zipFile = File.Create(zipedFileName);
        var zipStream = new ZipOutputStream(zipFile);
        var zipEntry = new ZipEntry(filename);
        zipStream.PutNextEntry(zipEntry);
        zipStream.SetLevel(compressionLevel);
        var buffer = new byte[2048];
        Int32 size = streamToZip.Read(buffer, 0, buffer.Length);
        zipStream.Write(buffer, 0, size);
        try
        {
            while (size < streamToZip.Length)
            {
                int sizeRead = streamToZip.Read(buffer, 0, buffer.Length);
                zipStream.Write(buffer, 0, sizeRead);
                size += sizeRead;
            }
        }
        finally
        {
            zipStream.Finish();
            zipStream.Close();
            streamToZip.Close();
        }
    }
    /// <summary> 
    /// 压缩单个文件 
    /// </summary> 
    /// <param name="fileToZip">要进行压缩的文件名，全路径</param> 
    /// <param name="zipedFile">压缩后生成的压缩文件名,全路径</param> 
    public void ZipFile(string fileToZip, string zipedFile)
    {
        // 如果文件没有找到，则报错 
        if (!File.Exists(fileToZip))
        {
            throw new FileNotFoundException("指定要压缩的文件: " + fileToZip + " 不存在!");
        }
        using (FileStream fileStream = File.OpenRead(fileToZip))
        {
            byte[] buffer = new byte[fileStream.Length];
            fileStream.Read(buffer, 0, buffer.Length);
            fileStream.Close();
            using (FileStream zipFile = File.Create(zipedFile))
            {
                using (ZipOutputStream zipOutputStream = new ZipOutputStream(zipFile))
                {
                    // string fileName = fileToZip.Substring(fileToZip.LastIndexOf("\\") + 1);
                    string fileName = Path.GetFileName(fileToZip);
                    var zipEntry = new ZipEntry(fileName)
                    {
                        DateTime = DateTime.Now,
                        IsUnicodeText = true
                    };
                    zipOutputStream.PutNextEntry(zipEntry);
                    zipOutputStream.SetLevel(5);
                    zipOutputStream.Write(buffer, 0, buffer.Length);
                    zipOutputStream.Finish();
                    zipOutputStream.Close();
                }
            }
        }
    }
    /// <summary>
    /// 压缩多个目录或文件
    /// </summary>
    /// <param name="folderOrFileList">待压缩的文件夹或者文件，全路径格式,是一个集合</param>
    /// <param name="zipedFile">压缩后的文件名，全路径格式</param>
    /// <param name="password">压宿密码</param>
    /// <returns></returns>
    public bool ZipManyFilesOrDictorys(IEnumerable<string> folderOrFileList, string zipedFile, string password)
    {
        bool res = true;
        using (var s = new ZipOutputStream(File.Create(zipedFile)))
        {
            s.SetLevel(6);
            if (!string.IsNullOrEmpty(password))
            {
                s.Password = password;
            }
            foreach (string fileOrDir in folderOrFileList)
            {
                //是文件夹
                if (Directory.Exists(fileOrDir))
                {
                    res = ZipFileDictory(fileOrDir, s, "");
                }
                else
                {
                    //文件
                    res = ZipFileWithStream(fileOrDir, s);
                }
            }
            s.Finish();
            s.Close();
            return res;
        }
    }
    /// <summary>
    /// 带压缩流压缩单个文件
    /// </summary>
    /// <param name="fileToZip">要进行压缩的文件名</param>
    /// <param name="zipStream"></param>
    /// <returns></returns>
    private bool ZipFileWithStream(string fileToZip, ZipOutputStream zipStream)
    {
        //如果文件没有找到，则报错
        if (!File.Exists(fileToZip))
        {
            throw new FileNotFoundException("指定要压缩的文件: " + fileToZip + " 不存在!");
        }
        //FileStream fs = null;
        FileStream zipFile = null;
        ZipEntry zipEntry = null;
        bool res = true;
        try
        {
            zipFile = File.OpenRead(fileToZip);
            byte[] buffer = new byte[zipFile.Length];
            zipFile.Read(buffer, 0, buffer.Length);
            zipFile.Close();
            zipEntry = new ZipEntry(Path.GetFileName(fileToZip));
            zipStream.PutNextEntry(zipEntry);
            zipStream.Write(buffer, 0, buffer.Length);
        }
        catch
        {
            res = false;
        }
        finally
        {
            if (zipEntry != null)
            {
            }

            if (zipFile != null)
            {
                zipFile.Close();
            }
            GC.Collect();
            GC.Collect(1);
        }
        return res;

    }

    /// <summary>
    /// 递归压缩文件夹方法
    /// </summary>
    /// <param name="folderToZip"></param>
    /// <param name="s"></param>
    /// <param name="parentFolderName"></param>
    private bool ZipFileDictory(string folderToZip, ZipOutputStream s, string parentFolderName)
    {
        bool res = true;
        ZipEntry entry = null;
        FileStream fs = null;
        Crc32 crc = new Crc32();
        try
        {
            //创建当前文件夹
            entry = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/")); //加上 “/” 才会当成是文件夹创建
            s.PutNextEntry(entry);
            s.Flush();
            //先压缩文件，再递归压缩文件夹
            var filenames = Directory.GetFiles(folderToZip);
            foreach (string file in filenames)
            {
                //打开压缩文件
                fs = File.OpenRead(file);
                byte[] buffer = new byte[fs.Length];
                fs.Read(buffer, 0, buffer.Length);
                entry = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/" + Path.GetFileName(file)));
                entry.DateTime = DateTime.Now;
                entry.Size = fs.Length;
                fs.Close();
                crc.Reset();
                crc.Update(buffer);
                entry.Crc = crc.Value;
                s.PutNextEntry(entry);
                s.Write(buffer, 0, buffer.Length);
            }
        }
        catch
        {
            res = false;
        }
        finally
        {
            if (fs != null)
            {
                fs.Close();
            }
            if (entry != null)
            {
            }
            GC.Collect();
            GC.Collect(1);
        }
        var folders = Directory.GetDirectories(folderToZip);
        foreach (string folder in folders)
        {
            if (!ZipFileDictory(folder, s, Path.Combine(parentFolderName, Path.GetFileName(folderToZip))))
            {
                return false;
            }
        }
        return res;
    }
}

}