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

For Core 2.x versions, you have to do two things. First thing is you need to add following code inside the ConfigureServices method of Startup.cs file.

services.AddMvc()
.AddMvcOptions(o => o.OutputFormatters.Add(
    new XmlDataContractSerializerOutputFormatter())
);

And then add the Accept "application/xml" header to the request as below on Postman. Then XML formatted result will be returned.