C#实现多文件打包压缩(.Net Core)

/// <summary>
        /// 压缩文件
        /// </summary>
        /// <param name="fileName">压缩后获得的文件名</param>
        public static bool CompressFile(string dir, out string fileName)
        {
            string dest = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Desktop) + "\\" + string.Format("{0:yyyyMMddHHmmss}", DateTime.Now) + ".zip";   //默认压缩在桌面上
            if (!Directory.Exists(Path.GetDirectoryName(dest)))   //文件不存在就根据路径创建  E:\\test
                Directory.CreateDirectory(Path.GetDirectoryName(dest));
            using (ZipOutputStream zipStream = new ZipOutputStream(File.Create(dest)))
            {
                zipStream.SetLevel(6);   //压缩级别0-9
                CreateZip(dir, zipStream);
                fileName = dest;
                zipStream.Finish();
                zipStream.Close();
            }
            return true;
        }
        /// <summary>
        /// 压缩内容到 zipStream 流中
        /// </summary>
        /// <param name="source">源文件</param>
        /// <param name="zipStream">目标文件流(全路径+文件名+.zip)</param>

        private static void CreateZip(string source, ZipOutputStream zipStream)
        {
            Crc32 crc = new Crc32();
            string[] files = Directory.GetFileSystemEntries(source);  //获得所有文件名称和目录名称
            foreach (var file in files)
            {
                if (Directory.Exists(file))    //如果是文件夹里有文件则递归
                {
                    CreateZip(file, zipStream);
                }
                else    //如果不是则压缩
                {
                    using (FileStream fs = File.OpenRead(file))
                    {
                        byte[] buffer = new byte[fs.Length];
                        fs.Read(buffer, 0, buffer.Length);
                        string tempFileName = file.Substring(file.LastIndexOf("\\") + 1);  //获得当前文件路径的文件名
                        ZipEntry entry = new ZipEntry(tempFileName);
                        entry.DateTime = DateTime.Now;
                        entry.Size = fs.Length;
                        fs.Close();
                        crc.Reset();
                        crc.Update(buffer);
                        entry.Crc = crc.Value;
                        zipStream.PutNextEntry(entry);
                        zipStream.Write(buffer, 0, buffer.Length);
                    }
                }
            }
        }

/// <summary>
        /// 打包线上线下文件
        /// </summary>
        /// <param name="fileList">文件列表</param>
        /// <param name="savepath">保存路径</param>
        public static void ZipOnlineFile3(List<string> fileList, string savepath)
        {
            //判断保存的文件目录是否存在
            if (!File.Exists(savepath))
            {
                var file = new FileInfo(savepath);
                if (!file.Directory.Exists)
                {
                    file.Directory.Create();
                }
            }

            Crc32 crc = new Crc32();
            using (ZipOutputStream zipStream = new ZipOutputStream(File.Create(savepath)))
            {
                zipStream.SetLevel(9);   //压缩级别0-9  

                foreach (var url in fileList)
                {
                    byte[] buffer = new WebClient().DownloadData(url);
                    string tempFileName = GetFileNameByUrl(url);  //获得当前文件路径的文件名
                    ZipEntry entry = new ZipEntry(tempFileName);
                    entry.DateTime = DateTime.Now;
                    entry.Size = buffer.Length;
                    crc.Reset();
                    crc.Update(buffer);
                    zipStream.PutNextEntry(entry);
                    zipStream.Write(buffer, 0, buffer.Length);
                }
            }
        }

public static string GetFileNameByUrl(string url)
        {
            //判断路径是否为空
            if (string.IsNullOrWhiteSpace(url)) return null;

            //判断是否为线上文件
            if (url.ToLower().StartsWith("http"))
            {
                return url.Substring(url.LastIndexOf("/") + 1);
            }
            else
            {
                return url.Substring(url.LastIndexOf("\\") + 1);
            }
        }

/// <summary>
    /// 文件对象
    /// </summary>
    public class FileItem
    {
        /// <summary>
        /// 文件名称
        /// </summary>
        public string FileName { get; set; }
        /// <summary>
        /// 文件路径
        /// </summary>
        public string FileUrl { get; set; }
    }

/// <summary>
        /// 打包线上线下文件
        /// </summary>
        /// <param name="zipName">压缩文件名称</param>
        /// <param name="fileList">文件列表</param>
        /// <param name="savepath">保存路径</param>
        public static string ZipFiles(string zipName, List<FileItem> fileList, out string error)
        {
            error = string.Empty;

            string path = string.Format("/files/zipFiles/{0}/{1}/{2}/", DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day);
            //文件保存目录
            string directory = FileSavePath + path;
            string url = FileHostUrl.TrimEnd('/') + path + zipName;
            string savePath = directory + zipName;

            try
            {
                if (!Directory.Exists(directory))
                {
                    Directory.CreateDirectory(directory);
                }

                using (ZipOutputStream zipStream = new ZipOutputStream(File.Create(savePath)))
                {
                    zipStream.SetLevel(9);   //压缩级别0-9

                    foreach (var item in fileList)
                    {
                        byte[] buffer = new WebClient().DownloadData(item.FileUrl);
                        ZipEntry entry = new ZipEntry(item.FileName);
                        entry.DateTime = DateTime.Now;
                        entry.Size = buffer.Length;
                        zipStream.PutNextEntry(entry);
                        zipStream.Write(buffer, 0, buffer.Length);
                    }
                }
            }
            catch (Exception ex)
            {
                error = "文件打包失败：" + ex.Message;
            }

            return url;
        }

{
  "zipName": "test.zip",
  "fileList": [
    {
      "fileName": "123.png",
      "fileUrl": "https://file.yidongcha.cn/files/uploadfiles/image/2021/11/15/11c6de395fcc484faf4745ade62cf6e6.png"
    },
    {
      "fileName": "123/456/789.jpg",
      "fileUrl": "https://file.yidongcha.cn/files/uploadfiles/image/2021/11/15/fe922b250acf4344b8ca4d2aad6e0355.jpg"
    }
  ]
}