HttpClient.GetAsync（）挂起

Question

我正在尝试通过Xamarin.Forms应用程序使用.NET Web API。当我尝试调用get命令时，它会无限期地挂起并且永远不会返回内容。

using AspireITMobileSupport.Models;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace AspireITMobileSupport
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class Chat : ContentPage
    {

        private HttpClient _client;

        public static ObservableCollection<Message> Messages { get; set; }

        public Chat()
        {
            _client = new HttpClient();

            InitializeComponent();

            GetMessages().Wait();
        }

        private async Task GetMessages()
        {
            var response = await _client.GetAsync("[my site]/api/messages/1");
            if (response.IsSuccessStatusCode) 
                var content = response.Content.ReadAsStringAsync().Result;
                Messages = JsonConvert.DeserializeObject<ObservableCollection<Message>>(content);
            }

        }
    }
}

和网络API：

using AspireITSupportAPI.Models;
using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using System.Web.Http;

namespace AspireITSupportAPI.Controllers
{
    public class MessagesController : ApiController
    {

        private ApplicationDbContext _context;

        public MessagesController()
        {
            _context = new ApplicationDbContext();
        }

        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
            _context.Dispose();
        }

        // GET api/<controller>/5
        public HttpResponseMessage Get(int id)
        {
            var messages = _context.Messages.Where(i => i.User == id).ToList<Message>();
            return Request.CreateResponse(HttpStatusCode.OK, messages);
        }
    }
}

当我运行该应用程序时，它只是挂起然后崩溃。我知道GetMessages（）。Wait（）;将同步运行。那不是问题。我只想获得结果，然后再专注于使一切异步。我已经使用Restlet Client测试了API，并且那里的一切似乎都正常运行。

我需要更改我的API中的内容还是我的Xamarin代码错误？