.Net Core Web API 上传下载压缩存储

 #region 文件上传
        /// <summary>
        /// 文件上传
        /// </summary>
        /// <param name="file">文件上传内容</param>
        /// <returns></returns>
        [HttpPost]
        public async Task<string> UploaderFiles([Required] IFormFile file)
        {
            if (file.Length == 0)
            {
                throw new Exception("上传文件不能为空");
            }
            if (file.Length > 1024 * 1024 * 500)
            {
                throw new Exception("上传文件不能大于500M");
            }
            string fileName =file.FileName;
            Stream stream = file.OpenReadStream();
            byte[] buffer = new byte[stream.Length];
            await stream.ReadAsync(buffer, 0, buffer.Length);
            stream.Close();
            string fileClass = buffer[0].ToString() + buffer[1].ToString();
            string FilePath = Guid.NewGuid().ToString() + "\\" + FileName;
            string RootPath = Path.Combine(Tools.FilePath(), FilePath);
            string DirecotryPath = Path.GetDirectoryName(RootPath);
            if (!Directory.Exists(DirecotryPath))
            {
                Directory.CreateDirectory(DirecotryPath);
            }
            byte[] res;
            try
            {
                using MemoryStream ms = new MemoryStream();
                using ZipArchive zip = new ZipArchive(ms, ZipArchiveMode.Create, true);
                //通过aws下载文件流       
                ZipArchiveEntry entry = zip.CreateEntry(FileName);//压缩文件内创建一个文件,流是什么文件格式就用什么格式
                using Stream sw = entry.Open();
                await sw.WriteAsync(buffer, 0, buffer.Length);//将文件的字节写到文件中
                InvokeWriteFile(zip);//重新计算压缩文件的大小，此处参考别人的
                int nowPos = (int)ms.Position;
                res = new byte[ms.Length];
                ms.Position = 0;
                await ms.ReadAsync(res, 0, res.Length);
                ms.Position = nowPos;
            }
            catch (Exception ex)
            {
                throw new Exception("上传文件失败");
            }
            await File.WriteAllBytesAsync(RootPath + ".zip", res);
            return FilePath;
        }
        #endregion

#region 下载文件
       /// <summary>
       /// 下载文件
       /// </summary>
       /// <param name="filePath">文件地址</param>
       /// <returns></returns>
       [HttpGet]
       public async Task<FileStreamResult> DownLoadFiles(string filePath)
       {
           if (string.IsNullOrWhiteSpace(filePath))
           {
               throw new Exception("文件地址不能为空");
           }
           string FilePath = Path.Combine(Tools.FilePath(), filePath);
           string zipFilePath = FilePath + ".zip";
           if (!File.Exists(zipFilePath))
           {
               throw new Exception("文件未找到");
           }
           List<byte> bytes = new List<byte>();
           using ZipInputStream s = new ZipInputStream(File.OpenRead(zipFilePath));
           ZipEntry theEntry;
           while ((theEntry = s.GetNextEntry()) != null)
           {
               int size = 2048;
               byte[] data = new byte[2048];
               while (true)
               {
                   size = await s.ReadAsync(data, 0, data.Length);
                   if (size > 0)
                   {
                       bytes.AddRange(data);
                   }
                   else
                   {
                       break;
                   }
               }
           }
           MemoryStream memoryStream = new MemoryStream(bytes.ToArray());
           return File(memoryStream , "application/octet-stream;charset=UTF-8", new FileInfo(filePath).Name);
       }
       #endregion