windows Phone8.1:UI 由于异步等待，未显示下一页

Question

我想导航到下一页，但问题是我正在使用 async 和等待方法。

所以在后台 frame.navigate(typeof(nextpage)) 将我导航到下一页，但 UI 线程不导航并且同一页面保留在屏幕上，但我可以在控制台中看到 frame.navigate 正在工作，因为我正在传递参数。

下面是我的代码：

public async void ContinueWithWebAuthenticationBroker(WebAuthenticationBrokerContinuationEventArgs args)
        {
            string[] abc = new string[2];;
               System.Threading.CancellationTokenSource cts;
            cts = new System.Threading.CancellationTokenSource();


    string[] abc;

                ToastPrompt toast = new ToastPrompt();
                toast.Title = "Loading";
                toast.Message = "Please Wait";
                toast.Show();

                using (HttpClient client = new HttpClient())
                {

                    var response = client.GetAsync(new Uri("http://localhost:8080/impulse/total.jsp"));


                   string result = await responsefb.Content.ReadAsStringAsync();

                              try
                    {
                        Windows.Data.Json.JsonObject root = Windows.Data.Json.JsonValue.Parse(result).GetObject();

                        if (root["result"].GetString() == "true")
                        {

                            abc[0] = root["result"].GetString();
                            abc[1] = root["comment"].GetString();


                            Frame.Navigate(typeof(BasicPage1), abc);
                            System.Diagnostics.Debug.WriteLine("In IF");

                        }
                        else if(root["result"].GetString() == "false")
                        {
                             System.Diagnostics.Debug.WriteLine(root["result"].GetString());

                              abc[0] = root["comment"].GetString();

                             System.Diagnostics.Debug.WriteLine(abc);
                             toast.Hide();
                            cts.Cancel();
                            Frame.Navigate(typeof(signin),"hello");

                                    }

                        else 

                        { 

                        }

                    }
                    catch (Exception ex1)
                    {
                        System.Diagnostics.Debug.WriteLine("string is empty", ex1);
                    }

                }

我的下一页数据

 protected override void OnNavigatedTo(NavigationEventArgs e)

        {
            // base.OnNavigatedTo(e);
            var lastPage = Frame.BackStack.Last().SourcePageType;
            System.Diagnostics.Debug.WriteLine(lastPage);
            if (lastPage.ToString() == "App13.fb")
            {
                try
                {
                    var a = e.Parameter.ToString();
                    System.Diagnostics.Debug.WriteLine(a);


                }
                catch (Exception Ex)
                {
                    System.Diagnostics.Debug.WriteLine(Ex.ToString());
                }
            }
            else
            {

            }
        }

Answer 1

运行 UI 线程中的页面导航代码

var dispatcher = CoreWindow.GetForCurrentThread().Dispatcher;
dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
     Frame.Navigate(typeof(BasicPage1), abc);
});