c# how to deserialize IFormFile

Question

I'm sure somebody had the same problem, but I didn't find anything. I send post request to get the file, and I get this model as a response:

    public class ResponseWithFile
{
    public bool IsSuccessful { get; set; }
    public List<int> Errors { get; set; }
    public IFormFile File { get; set; }
}

I get this response from a controller:

    [Route("get")]
    [HttpPost]
    public async Task<IActionResult> GetFile([FromBody]GetFileDto request)
    {
        var result = _fileService.GetFile(request.Id, request.ContentType);
        if (result.IsSuccessful)
            return Ok(result);
        return BadRequest(result);
    }

The response is correct, I can read it into a string, but when I try to deserialize it into response object I get error:

            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
        string respString = string.Empty;
        using (var sr = new StreamReader(resp.GetResponseStream()))
        {
            respString = sr.ReadToEnd();
        }

        var serResp = (ResponseWithFile)JsonConvert.DeserializeObject(respString);//error here

InvalidCastException: Unable to cast object of type 'Newtonsoft.Json.Linq.JObject' to type 'ServiceModels.ResponseWithFile

I'm sure it's because of IFormFile object. What am I doing wrong?

Answer 1

Try this:

var serResp = JsonConvert.DeserializeObject<ResponseWithFile>(respString);

or

  var serResp = (ResponseWithFile)JsonConvert.DeserializeObject(respString, typeof(ResponseWithFile));