var filePath = Directory.GetCurrentDirectory() + $@"\ImgZip\{DateTime.Now:yyyy-MM-dd}";

            using (ZipFile zip = ZipFile.Create(@"D:\test.zip"))

            {

                zip.BeginUpdate();

                zip.SetComment("这是我的压缩包");

                zip.AddDirectory(filePath);  //添加一个文件夹(这个方法不会压缩文件夹里的文件)

                zip.Add(filePath + @"\118e0e67b82e43698b447f1d79a3f9a0.jpg");     //添加文件夹里的文件

                zip.CommitUpdate();

            }

            FileStream fileStream = System.IO.File.OpenRead(@"D:\test.zip");//打开压缩文件

            buffer = new byte[fileStream.Length];

            fileStream.Read(buffer, 0, buffer.Length);

            fileStream.Close();

             return File(buffer , "application/zip", "118e0e67b82e43698b447f1d79a3f9a0.zip");

//获取远程文件，并读取为流文件

 string Url = @"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1597509647515&di=3e0ca14b97aafdfd69fc60d3323eec06&imgtype=0&src=http%3A%2F%2Ft8.baidu.com%2Fit%2Fu%3D3571592872%2C3353494284%26fm%3D79%26app%3D86%26f%3DJPEG%3Fw%3D1200%26h%3D1290";


            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

            //超时时间

            request.Timeout = 60000;

            //获取回写流

            WebResponse response = request.GetResponse();

            Stream stream = response.GetResponseStream();

            MemoryStream outstream = new MemoryStream();

            const int bufferLen = 4096;

            byte[] buffer = new byte[bufferLen];

            int count = 0;

            while ((count = stream.Read(buffer, 0, bufferLen)) > 0)

            {

                outstream.Write(buffer, 0, count);

            }

             byte[] result = null;

             //创建压缩流

            using (MemoryStream ms = new MemoryStream())

            {

                using ZipOutputStream zipStream = new ZipOutputStream(ms);

                //zipStream.Password = "123456";//设置压缩包密码

                //ZipEntry  斜杠表示文件夹 为自动按照填写的路径生成多级目录

                ZipEntry entry = new ZipEntry(@"文件夹1\文件夹2\118e0e67b82e43698b447f1d79a3f9a0.jpg")

                {

                    DateTime = DateTime.Now,//创建时间

                    IsUnicodeText = true//解决中文乱码

                };

                zipStream.PutNextEntry(entry);

                zipStream.Write(outstream.ToArray(), 0, bytes.Length);

                zipStream.CloseEntry();

                zipStream.IsStreamOwner = false;

                zipStream.Finish();

                zipStream.Close();

                ms.Position = 0;

                //压缩后的数据被保存到了byte[]数组中。

                result = ms.ToArray();

            }

              return File(result, "application/zip", "118e0e67b82e43698b447f1d79a3f9a0.zip");