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NuGet引用官网自带的System.IO.Compression.ZipFile;

var filename = "测试压缩解压文件";
var path = Directory.GetCurrentDirectory() + "/wwwroot/file/" + filename + ".pdf";
//这里是获取到文件的byte数组
byte[] fileBuffer1 = Convert.FromBase64String(invData);
//将byte数组转换为文件并保存到指定地址
FileSystem.Bytes2File(fileBuffer1, path);
//添加文件到指定压缩文件中
ZipFile.CreateFromDirectory(Directory.GetCurrentDirectory() + "/wwwroot/file", Directory.GetCurrentDirectory() + "/wwwroot/" + zipFileName);
//删除文件夹下的所有文件
FileSystem.DeleteDirAllFile(Directory.GetCurrentDirectory() + "/wwwroot/file/");
byte[] fileBuffer;
//文件转成byte二进制数组
fileBuffer = FileSystem.File2Bytes(Directory.GetCurrentDirectory() + "/wwwroot/" + zipFileName);
//这里开始上传文件

//将指定 zip 存档中的所有文件都解压缩到文件系统的一个目录下
ZipFile.ExtractToDirectory(Directory.GetCurrentDirectory() + "/wwwroot/" + zipFileName,Directory.GetCurrentDirectory() + "/wwwroot/file");

 public class FileSystem
    {
        /// <summary>
        /// 将byte数组转换为文件并保存到指定地址
        /// </summary>
        /// <param name="buff">byte数组</param>
        /// <param name="savepath">保存地址</param>
        public static void Bytes2File(byte[] buff, string savepath)
        {
            if (System.IO.File.Exists(savepath))
            {
                System.IO.File.Delete(savepath);
            }

            FileStream fs = new FileStream(savepath, FileMode.CreateNew);
            BinaryWriter bw = new BinaryWriter(fs);
            bw.Write(buff, 0, buff.Length);
            bw.Close();
            fs.Close();
        }

        /// <summary>
        /// 将文件转换为byte数组
        /// </summary>
        /// <param name="path">文件地址</param>
        /// <returns>转换后的byte数组</returns>
        public static byte[] File2Bytes(string path)
        {
            if (!System.IO.File.Exists(path))
            {
                return new byte[0];
            }

            FileInfo fi = new FileInfo(path);
            byte[] buff = new byte[fi.Length];


            FileStream fs = fi.OpenRead();
            fs.Read(buff, 0, Convert.ToInt32(fs.Length));
            fs.Close();


            return buff;
        }

        /// <summary>
        /// 删除文件夹下的所有文件
        /// </summary>
        /// <param name="dirRoot"></param>
        public static void DeleteDirAllFile(string dirRoot)
        {
            DirectoryInfo aDirectoryInfo = new DirectoryInfo(Path.GetDirectoryName(dirRoot));
            FileInfo[] files = aDirectoryInfo.GetFiles("*.*", SearchOption.AllDirectories);
            foreach (FileInfo f in files)
            {
                File.Delete(f.FullName);
            }
        }
    }