[HttpPost("upload")]

public async Task<ActionResult<string>> Upload([FromForm] UploadFileData data)

{

    using (var fileStream = data.file.OpenReadStream())

    {

        using (var zip = ZipFile.Open($@"C:\keatkeat\my-projects\aspnetcore-projects\asp.net core 2.2\zip-file\Project\dada.zip", ZipArchiveMode.Create))

        {

            var entry = zip.CreateEntry("abc.pdf");

            using (var entryStream = entry.Open())

            {

                await fileStream.CopyToAsync(entryStream);

            }

        }

    }

    return Ok();

}

string root = AppDomain.CurrentDomain.BaseDirectory;

string[] inputFiles = new string[] { root + "angular1.min.js", root + "Capture.PNG" };

string outputFile = root + "myZip4.zip";

FileInfo file = new FileInfo(outputFile);

if (file.Exists) throw new Exception("error");

bool notExist = inputFiles.Any(f =>

{

    FileInfo fileInfo = new FileInfo(f);

    return !fileInfo.Exists;

});

if (notExist) throw new Exception("error");

using (var zip = ZipFile.Open(outputFile, ZipArchiveMode.Create))

{

    foreach (var inputFile in inputFiles)

    {

        string fileName = Path.GetFileName(inputFile);

        zip.CreateEntryFromFile(inputFile, fileName);

    }

}

//ZipFile.CreateFromDirectory(root + "myfolder", root + "abc.zip");

[ODataRoute("uploadFile")]

public async Task<IHttpActionResult> uploadFile()

{

    if (!Request.Content.IsMimeMultipartContent()) throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);

    string root = AppDomain.CurrentDomain.BaseDirectory + "UploadedFiles";

    var provider = new Helper.MyMultipartFormDataStreamProvider(root);

    await Request.Content.ReadAsMultipartAsync(provider);

    string localFilePath = provider.FileData[].LocalFileName;

    //do zip..., delete original file, if multiple then loop

    string fileName = Path.GetFileNameWithoutExtension(localFilePath) + ".zip";

    return Ok(fileName);

}

string root = AppDomain.CurrentDomain.BaseDirectory;

var memoryStream = new MemoryStream();

using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))

{

    var demoFile = archive.CreateEntryFromFile(root + "angular.min.js", "angular.min.js");

}

memoryStream.Seek(, SeekOrigin.Begin);

string filepath = AppDomain.CurrentDomain.BaseDirectory + "angular.min.zip";

string contentType = MimeMapping.GetMimeMapping(filepath);

return File(memoryStream, contentType, "angular.min.zip");