ICSharpCode.SharpZipLib.Zip 多个文件合并下载

public class ZipHelper
    {
        #region 压缩  
        /// <summary>
        /// 将文件压缩到文件流中
        /// </summary>
        /// <param name="files">文件的路径</param>
        /// <param name="zipStream">文件流</param>
        /// <returns></returns>
        public static bool ZipDirectory(List<string> files, ZipOutputStream zipStream)
        {
            bool result = true;
            ZipEntry ent = null;
            FileStream fs = null;
            Crc32 crc = new Crc32();

            try
            {
                foreach (string file in files)
                {
                    fs = File.OpenRead(file);

                    byte[] buffer = new byte[fs.Length];
                    fs.Read(buffer, 0, buffer.Length);
                    ent = new ZipEntry(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);
            }
            return result;
        }



        /// <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(Path.GetFileName(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(Path.GetFileName(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(9);
            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;

        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="files">要压缩的路径</param>
        /// <param name="zipedFile">压缩后的文件名</param>
        /// <returns></returns>
        public static MemoryStream Zip(List<string> files, string basedir, string password)
        {
            ZipEntry ent = null;
            FileStream fs = null;
            Crc32 crc = new Crc32();
            MemoryStream ms = new MemoryStream();//支持存储区为内存的流
            var zipMs = new MemoryStream();


            using (ZipOutputStream zipStream = new ZipOutputStream(zipMs))
            {
                if (!string.IsNullOrEmpty(password))
                {
                    zipStream.Password = password;
                }
                zipStream.SetLevel(9);
                foreach (string file in files)
                {
                    string fileName = file.Replace(basedir, "");
                    using (fs = File.OpenRead(file))
                    {
                        zipStream.PutNextEntry(new ZipEntry(fileName));
                        byte[] buffer = new byte[fs.Length];
                        fs.Read(buffer, 0, buffer.Length);
                        zipStream.Write(buffer, 0, buffer.Length);
                        zipStream.Flush();
                    }
                }
                zipStream.Finish();
                zipMs.Position = 0;
                zipMs.WriteTo(ms);
            }
            ms.Position = 0;
            return ms;

        }


        public static MemoryStream Zip(List<string> files, string basedir)
        {
            return Zip(files, basedir, string.Empty);
        }

        /// <summary>
        /// 多个ZIP合并
        /// </summary>
        /// <param name="files"></param>
        /// <returns></returns>
        public static MemoryStream Zip(Dictionary<string, MemoryStream> files)
        {  
            Crc32 crc = new Crc32();
            MemoryStream ms = new MemoryStream();//支持存储区为内存的流
            var zipMs = new MemoryStream();
            using (ZipOutputStream zipStream = new ZipOutputStream(zipMs))
            {
                zipStream.SetLevel(9);
                foreach (KeyValuePair<string, MemoryStream> file in files)
                {
                    zipStream.PutNextEntry(new ZipEntry(file.Key));
                    zipStream.Write(file.Value.ToArray(), 0, (int)file.Value.Length);
                    zipStream.Flush();
                }
                zipStream.Finish();
                zipMs.Position = 0;
                zipMs.WriteTo(ms);
            }
            ms.Position = 0;
            return ms;

        }

        #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 = 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


        public static List<string> GetDirectory(string filePath)
        {
            List<string> list = new List<string>();
            int index = 0;
            using (ZipInputStream zip = new ZipInputStream(File.OpenRead(filePath)))
            {
                ZipEntry theEntry;
                while ((theEntry = zip.GetNextEntry()) != null)
                {
                    index = theEntry.Name.Length - (theEntry.Name.Replace("/", "")).Length;
                    if (theEntry.IsDirectory && index == 1)
                    {
                        list.Add(AppDomain.CurrentDomain.BaseDirectory + theEntry.Name.Replace("/", "\\"));
                    }

                }
            }
            return list;
        }

        /// <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="packagename">包名</param>   
        /// <returns>是否压缩成功</returns>   
        public static bool ZipDirectorys(List<string> folderToZips, string zipedFile, string packagename)
        {
            bool result = false;
            using (ZipFile zip = ICSharpCode.SharpZipLib.Zip.ZipFile.Create(zipedFile))
            {
                zip.BeginUpdate();
                zip.AddDirectory(packagename);
                foreach (var folderToZip in folderToZips)
                {
                    if (!Directory.Exists(folderToZip)
                        || folderToZip.ToString().EndsWith("BackUP")
                        || folderToZip.ToString().EndsWith("Resource")
                        )
                        continue;
                    var files = Director(folderToZip);
                    string entrypath = Path.Combine(Path.GetFileName(packagename), Path.GetFileName(folderToZip) + "\\");
                    zip.AddDirectory(entrypath);
                    foreach (var f in files)
                    {
                        zip.Add(f, entrypath + Path.GetFileName(f));
                        //zip.Add(f);
                    }
                }
                zip.CommitUpdate();
                return true;
            }
        }



        private static List<string> Director(string dir)
        {
            List<string> list = new List<string>();
            DirectoryInfo d = new DirectoryInfo(dir);
            FileSystemInfo[] fsinfos = d.GetFileSystemInfos();
            foreach (FileSystemInfo fsinfo in fsinfos)
            {
                if (fsinfo is DirectoryInfo)     //判断是否为文件夹  
                {
                    if (fsinfo.FullName.EndsWith("BackUP")
                       || fsinfo.FullName.EndsWith("Resource")
                       )
                        continue;
                    list.AddRange(Director(fsinfo.FullName));//递归调用  
                }
                else
                {
                    list.Add(fsinfo.FullName);//输出文件的全部路径  
                }
            }
            return list;
        }

        /// <summary>
        /// 获取ZIP包中的所有文件名称
        /// </summary>
        /// <param name="zipfile"></param>
        /// <returns></returns>
        public static List<string> PageFiles(string zipfile)
        {
            List<string> list = new List<string>();
            using (ZipFile zip = new ZipFile(zipfile))
            {
                foreach (ZipEntry e in zip)
                {
                    if (e.IsFile)
                    {
                        list.Add(e.Name);
                    }
                }

            }
            return list;
        }

        /// <summary>
        /// 获取ZIP包中的所有文件名称
        /// </summary>
        /// <param name="zipfile"></param>
        /// <returns></returns>
        public static List<string> PageFiles(FileStream zipfile)
        {
            List<string> list = new List<string>();
            byte[] zipBytes = StreamToBytes(zipfile);
            Stream stream = new MemoryStream(zipBytes);

            using (ZipFile zip = new ZipFile(stream))
            {
                foreach (ZipEntry e in zip)
                {
                    if (e.IsFile)
                    {
                        list.Add(e.Name);
                    }
                }

            }
            return list;
        }

        /// <summary>
        /// 获取ZIP包中的所有文件名称
        /// </summary>
        /// <param name="zipfile"></param>
        /// <returns></returns>
        public static List<string> PageFiles(Stream zipfile)
        {
            List<string> list = new List<string>();
            byte[] zipBytes = StreamToBytes(zipfile);
            Stream stream = new MemoryStream(zipBytes);

            using (ZipFile zip = new ZipFile(stream))
            {
                foreach (ZipEntry e in zip)
                {
                    if (e.IsFile)
                    {
                        list.Add(e.Name);
                    }
                }

            }
            return list;
        }

        public static byte[] StreamToBytes(Stream stream)
        {
            byte[] bytes = new byte[stream.Length];
            stream.Read(bytes, 0, bytes.Length);

            // 设置当前流的位置为流的开始 
            stream.Seek(0, SeekOrigin.Begin);
            return bytes;
        }

        /// <summary>
        /// 获取ZIP包中的所有目录名称
        /// </summary>
        /// <param name="zipfile"></param>
        /// <returns></returns>
        public static List<string> ZipDirectorys(Stream zipfile)
        {
            List<string> list = new List<string>();

            byte[] zipBytes = StreamToBytes(zipfile);
            Stream stream = new MemoryStream(zipBytes);

            using (ZipFile zip = new ZipFile(stream))
            {
                foreach (ZipEntry e in zip)
                {
                    if (e.IsDirectory && !list.Contains(e.Name))
                    {
                        list.Add(e.Name);
                    }
                }

            }
            return list;
        }

        /// <summary>
        /// 获取ZIP包中的所有目录名称
        /// </summary>
        /// <param name="zipfile"></param>
        /// <returns></returns>
        public static List<string> ZipDirectorys(string zipfile)
        {
            List<string> list = new List<string>();
            using (ZipFile zip = new ZipFile(zipfile))
            {
                foreach (ZipEntry e in zip)
                {
                    if (e.IsDirectory && !list.Contains(e.Name))
                    {
                        list.Add(e.Name);
                    }
                }

            }
            return list;
        }
    }

Dictionary<string, MemoryStream> dic = new Dictionary<string, MemoryStream>();

//循环 

MemoryStream fsm = ZipHelper.Zip(files, Server.MapPath(vpath));//files 文件列表 List<string> files,Server.MapPath(vpath)//目录
 dic.Add("XXX.zip", fsm);

//循环

MemoryStream fs = ZipHelper.Zip(dic);//合并

//输出
if (fs != null)
            {
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment;filename=download.zip");
                byte[] bt = fs.ToArray();
                Response.OutputStream.Write(bt, 0, bt.Length);
                fs.Close();
            }

Dictionary<string, MemoryStream> dic = new Dictionary<string, MemoryStream>();

//循环 

MemoryStream fsm = ZipHelper.Zip(files, Server.MapPath(vpath));//files 文件列表 List<string> files,Server.MapPath(vpath)//目录
 dic.Add("XXX.zip", fsm);

//循环

MemoryStream fs = ZipHelper.Zip(dic);//合并

//输出
if (fs != null)
            {
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment;filename=download.zip");
                byte[] bt = fs.ToArray();
                Response.OutputStream.Write(bt, 0, bt.Length);
                fs.Close();
            }