How to post and receive a file with web api

Question

I have a Api Post method that I want to be able to accept any file type and that looks like this:

[HttpPost]
    public async Task Post(         


        

Answer 1

The MultipartFormDataContent from the System.Net.Http namespace will allow you to post multipart form data.

private async Task PostAttachment(byte[] data, Uri url, string contentType)
{
  HttpContent content = new ByteArrayContent(data);

  content.Headers.ContentType = new MediaTypeHeaderValue(contentType); 

  using (var form = new MultipartFormDataContent())
  {
    form.Add(content);

    using(var client = new HttpClient())
    {
      var response = await client.PostAsync(url, form);
      return await response.Content.ReadAsStringAsync();
    }
  }
}