WebAPI HttpPost take IFormFile and a model as input parameters

Question

I want to create a method that uploads a file + takes an instance of a class\struct as an additional argument.

// Works
[HttpPost("test_1")]
public async Task<IActionResult> Test1(IFormFile file) { return Ok(); }

public struct MyModel
{
    public int Value1 { get; set; }
    public int Value2 { get; set; }
}

// Doesn't work
[HttpPost("test_2")]
public async Task<IActionResult> Test2(IFormFile file, MyModel model) { return Ok(); }

Calling test_2 produces following result:

{
  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.13",
  "title": "Unsupported Media Type",
  "status": 415,
  "traceId": "8000000c-0007-fd00-b63f-84710c7967bb"
}

How should I modify test_2 method to produce required result?

Answer 1

Because your request contains multi part (file and optional data).
So change it to form-data and you can get them with [FromForm] on Api.
Try this

public struct MyModel
{
    public int Value1 { get; set; }
    public int Value2 { get; set; }
    public IFormFile Files { get; set; }
}

[HttpPost("test_2")]
public async Task<IActionResult> Test2([FromForm]MyModel model) { return Ok(); }

Hope it helps