How to download a file in ASP.NET Core

Question

In MVC, we have used following code to download a file. In ASP.NET core, how to achieve this?

HttpResponse response = HttpContext.Current.Response;                   


        

Answer 1

Example for Asp.net Core 2.1+ (Best practice)

Startup.cs:

private readonly IHostingEnvironment _env;

public Startup(IConfiguration configuration, IHostingEnvironment env)
{
    Configuration = configuration;
    _env = env;
}

services.AddSingleton(_env.ContentRootFileProvider); //Inject IFileProvider

SomeService.cs:

private readonly IFileProvider _fileProvider;

public SomeService(IFileProvider fileProvider)
{
    _fileProvider = fileProvider;
}

public FileStreamResult GetFileAsStream()
{
    var stream = _fileProvider
        .GetFileInfo("RELATIVE PATH TO FILE FROM APP ROOT")
        .CreateReadStream();

    return new FileStreamResult(stream, "CONTENT-TYPE")
}

Controller will return IActionResult

[HttpGet]
public IActionResult Get()
{
    return _someService.GetFileAsStream() ?? (IActionResult)NotFound();
}