Where does ASP.NET 5 / MVC6 store uploaded files?

Question

If I upload a file and it's represented by a Microsoft.AspNet.Http.Features.Internal.FormFile, will it have been stored anywhere on the filesystem of the process, or does it point to bytes that simply exist in memory?

Answer 1

FormFile object based on HttpRequest.Body memory stream. See more details on github

var file = new FormFile(_request.Body, section.BaseStreamOffset.Value, section.Body.Length, name, fileName)
{
    Headers = new HeaderDictionary(section.Headers),
};

You can call FormFile.SaveAs() or FormFile.SaveAsAsync() to save file in filesystem:

public class HomeController : Controller
{
    public IHostingEnvironment Hosting { get; set; }

    public async Task<IActionResult> Index(IFormFile file)
    {
        await file.SaveAsAsync(Path.Combine(Hosting.WebRootPath, "storage", "file.txt"));
        //...
    }
}