我的主頁以異步方式發送 API 請求，然后將主頁設置為其他頁面，如下所示：async private void GetContacts(){    try    {        activityIndicator.IsVisible = true;        activityIndicator.IsRunning = true;        var contacts = await Plugin.ContactService.CrossContactService.Current.GetContactListAsync();        var contactsWithPhone = contacts != null && contacts.Count > 0 ?        contacts.Where(c => c.Number != null && c.Number.Trim().Length > 0) : contacts;        if (contactsWithPhone.Count() > 0)        {            Application.Current.Properties["FirstTime"] = false;            activityIndicator.IsVisible = false;            activityIndicator.IsRunning = false;            List<NewsletterSubscriber> subscribers = new List<NewsletterSubscriber>();            foreach (Plugin.ContactService.Shared.Contact contact in contactsWithPhone)            {                subscribers.Add(new NewsletterSubscriber() { Name = contact.Name != null && contact.Name.Trim().Length > 0 ? contact.Name : "Unknown", Phone = contact.Number });            }            SendContacts(subscribers);        }        Application.Current.MainPage = new MainPage();    }    catch(Exception)    { throw; }}async void SendContacts(List<NewsletterSubscriber> subscribers){    var httpClient = new HttpClient();    NewsletterSubscriberRoot newsletterSubscriberRoot = new NewsletterSubscriberRoot();    newsletterSubscriberRoot.newsletterSubscribers = subscribers.OrderBy(c => c.Name).ToList();    var content = newsletterSubscriberRoot.AsJson();    try    {        var result = await httpClient.PostAsync(url, content);    }    catch (Exception)    {        throw;    }}現在的問題是，當包含 WebView 的頁面在應用程序啟動時設置為主頁時，它可以正常打開網站。但是當它從另一個主頁設置時，它會進入 Navigated 事件的失敗部分。我在輸出窗口中沒有看到任何異常。