Why won't my ASP.Net Core Web API Controller return XML?

Question

I have the following simple Web API controller:

    // GET: api/customers
    [HttpGet]
    public async Task Get()
        {
        var         


        

Answer 1

The following solution worked for me nicely.

At Startup.cs

services.AddMvc()
       .AddXmlSerializerFormatters()
       .AddXmlDataContractSerializerFormatters();

At YourController.cs

    [HttpGet]
    [Route("Get")]
    [Produces("application/xml")] // If you don't like to send Content-Type header
    public IActionResult Get()
    {
        try
        {                
            var user = _userManager.FindByNameAsync('user').Result;
            if (user != null)
            {
                if (!_userManager.CheckPasswordAsync(user, 'password').Result)
                {
                    return Unauthorized();
                }
                else
                {
                    var result = _services.GetDataFromService(Convert.ToInt64(2), start_date, end_date);
                    return Ok(result);
                }
            }
            else
            {
                return Unauthorized();
            }
        }
        catch (Exception ex)
        {
            return Unauthorized();
        }
    }