HttpClient: How to upload multiple files at once

Question

I am trying to upload muliple files using System.Net.Http.HttpClient.

using (var content = new MultipartFormDataContent())
{
   content.Add(new StreamContent         


        

Answer 1

Nailed it. But behaviour is strange.

using (var content = new MultipartFormDataContent())
{
    content.Add(CreateFileContent(imageStream, "image.jpg", "image/jpeg"));
    content.Add(CreateFileContent(signatureStream, "image.jpg.sig", "application/octet-stream"));

    var response = await httpClient.PostAsync(_profileImageUploadUri, content);
    response.EnsureSuccessStatusCode();
}

private StreamContent CreateFileContent(Stream stream, string fileName, string contentType)
{
    var fileContent = new StreamContent(stream);
    fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data") 
    { 
        Name = "\"files\"", 
        FileName = "\"" + fileName + "\""
    }; // the extra quotes are key here
    fileContent.Headers.ContentType = new MediaTypeHeaderValue(contentType);            
    return fileContent;
}

[HttpPost]
public ActionResult UploadProfileImage(IList<HttpPostedFileBase> files)
{
    if(files == null || files.Count != 2)
        return new HttpStatusCodeResult(HttpStatusCode.BadRequest);

    // more code
}