Upload files and JSON in ASP.NET Core Web API

Question

How can I upload a list of files (images) and json data to ASP.NET Core Web API controller using multipart upload?

I can successfully receive a list of files, upload

Answer 1

Following the excellent answer by @bruno-zell, if you have only one file (I didn't test with an IList) you can also just declare your controller as this :

public async Task Create([FromForm] CreateParameters parameters, IFormFile file)
{
    const string filePath = "./Files/";
    if (file.Length > 0)
    {
        using (var stream = new FileStream($"{filePath}{file.FileName}", FileMode.Create))
        {
            await file.CopyToAsync(stream);
        }
    }

    // Save CreateParameters properties to database
    var myThing = _mapper.Map(parameters);

    myThing.FileName = file.FileName;

    _efContext.Things.Add(myThing);
    _efContext.SaveChanges();


    return Ok(_mapper.Map(myThing));
}

Then you can use the Postman method shown in Bruno's answer to call your controller.