title: NSwag Wep Api 2 multipart/form-data Attribute / file upload
body: <p>I am trying to setup a Controller Method with NSwag where I can Upload a multipart/form-data file</p>
  
  <pre><code>    [HttpPost]
      [Route("{number:long}")]
      [ValidateMimeMultipartContentFilter]
      [SwaggerResponse(500, typeof(string), Description = "Error")]
      public async Task&lt;IHttpActionResult&gt; Upload(long number)
      {
               //My backend code for file upload
      }
  </code></pre>
  
  <p>But I am not able to upload a file through NSwag webinterface. In ASP.NET Core you have a Attribute for this issue I think, but how can I get this support in Web Api 2</p>