using Windows.UI.Xaml.Controls;
using System.Threading.Tasks;
using System.Net.Http;
using System;

namespace AppUWP1
{
     public sealed partial class MainPage : Page
     {
          public MainPage()
          {
               this.InitializeComponent();

               Task.Run(async () =>
               {
                    await SendApiRequest();
               });

          }

          public async Task SendApiRequest()
          {
               try
               {
                    string url = "https://localhost:5001/my/books";

                    HttpClient api = new HttpClient();
                    var response = await api.GetAsync(url);
                    if (response.StatusCode == System.Net.HttpStatusCode.OK)
                    {
                         var result = await response.Content.ReadAsStringAsync();
                    }
               }
               catch (Exception e)
               {
               }
          }
     }
}

[ApiController]
[Route("my")]
public class MyController : ControllerBase
{
     [HttpGet]
     [Route("books")]
     public IActionResult My1()
     {
          return Ok("Books: 'Walk in street', 'Sunny day1'");
     }
}