I have followed this guide to implement facebook login and while importing the project from Github I've run into an issue. When I run the project from github it works fine however if I try to copy the code into my existing project I get a white view with no button.
The view:
<Page x:Class="IWork4You.LoginView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:IWork4You" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"> <Grid> <WebView x:Name="RequestView" Visibility="Collapsed" Width="400" Height="800" NavigationCompleted="RequestView_OnNavigationCompleted"/> <StackPanel Margin="0, 0, 0, 0" x:Name="AppContent"> <Button Content="Login" Click="OnLoginClicked" HorizontalAlignment="Center" VerticalAlignment="Center" /> <TextBlock x:Name="MyName" Style="{StaticResource SubheaderTextBlockStyle}" /> <Button Content="Invite friends" Click="OnInviteFriendsClicked" x:Name="InviteFriends" Visibility="Collapsed" /> <TextBlock Text="Invited friends" Style="{StaticResource HeaderTextBlockStyle}" x:Name="FriendsHeader" Visibility="Collapsed"/> <ListView x:Name="Friends" Margin="0, 20, 0, 0" Visibility="Collapsed"> <ListView.ItemTemplate> <DataTemplate> <StackPanel> <TextBlock Text="{Binding Path=FullName}" Style="{StaticResource BodyTextBlockStyle}" /> </StackPanel> </DataTemplate> </ListView.ItemTemplate> </ListView> </StackPanel> </Grid> Code:
namespace IWork4You { /// <summary> /// An empty page that can be used on its own or navigated to within a Frame. /// </summary> public sealed partial class LoginView : Page { public string AccessToken; public DateTime TokenExpiry; public string ClientId = "xxx"; private async Task Login() { //Client ID of the Facebook App (retrieved from the Facebook Developers portal) //Required permissions var scope = "public_profile, email"; var redirectUri = WebAuthenticationBroker.GetCurrentApplicationCallbackUri().ToString(); var fb = new FacebookClient(); var loginUrl = fb.GetLoginUrl(new { client_id = ClientId, redirect_uri = redirectUri, response_type = "token", scope = scope }); Uri startUri = loginUrl; Uri endUri = new Uri(redirectUri, UriKind.Absolute); WebAuthenticationResult result = await WebAuthenticationBroker.AuthenticateAsync(WebAuthenticationOptions.None, startUri, endUri); await ParseAuthenticationResult(result); } public async Task ParseAuthenticationResult(WebAuthenticationResult result) { switch (result.ResponseStatus) { //connection error case WebAuthenticationStatus.ErrorHttp: Debug.WriteLine("Connection error"); break; //authentication successfull case WebAuthenticationStatus.Success: var pattern = string.Format("{0}#access_token={1}&expires_in={2}", WebAuthenticationBroker.GetCurrentApplicationCallbackUri(), "(?<access_token>.+)", "(?<expires_in>.+)"); var match = Regex.Match(result.ResponseData, pattern); var access_token = match.Groups["access_token"]; var expires_in = match.Groups["expires_in"]; AccessToken = access_token.Value; TokenExpiry = DateTime.Now.AddSeconds(double.Parse(expires_in.Value)); await ShowUserInfo(); InviteFriends.Visibility = Visibility.Visible; break; //operation aborted by the user case WebAuthenticationStatus.UserCancel: Debug.WriteLine("Operation aborted"); break; default: break; } } private async Task ShowUserInfo() { FacebookClient client = new FacebookClient(AccessToken); dynamic user = await client.GetTaskAsync("me"); MyName.Text = string.Format("I'm {0}", user.name); } private async void OnLoginClicked(object sender, RoutedEventArgs e) { await Login(); } private void OnInviteFriendsClicked(object sender, RoutedEventArgs e) { AppContent.Visibility = Visibility.Collapsed; FacebookClient client = new FacebookClient(AccessToken); dynamic parameters = new ExpandoObject(); parameters.app_id = ClientId; parameters.message = "Invite your friends"; parameters.title = "Invite friends"; parameters.redirect_uri = "https://wp.qmatteoq.com/"; Uri dialogUrl = client.GetDialogUrl("apprequests", parameters); RequestView.Visibility = Visibility.Visible; RequestView.Navigate(dialogUrl); } private async void RequestView_OnNavigationCompleted(WebView sender, WebViewNavigationCompletedEventArgs args) { if (args.Uri.DnsSafeHost == "wp.qmatteoq.com") { sender.Visibility = Visibility.Collapsed; AppContent.Visibility = Visibility.Visible; FacebookClient client = new FacebookClient(AccessToken); dynamic result = client.ParseDialogCallbackUrl(args.Uri); if (result.error_code == null) { var items = (IDictionary<string, object>)result; ObservableCollection<FacebookUser> invitedFriends = new ObservableCollection<FacebookUser>(); foreach (KeyValuePair<string, object> value in items) { if (value.Key != "request") { string query = string.Format("/{0}", value.Value); dynamic user = await client.GetTaskAsync(query); FacebookUser facebookUser = new FacebookUser(); facebookUser.FullName = user.name; invitedFriends.Add(facebookUser); } } Friends.Visibility = Visibility.Visible; FriendsHeader.Visibility = Visibility.Visible; Friends.ItemsSource = invitedFriends; } else { MessageDialog dialog = new MessageDialog("The user has canceled the operation"); await dialog.ShowAsync(); } } } } } I know I am doing something wrong here I just can't figure out what it is.
1 Answers
Answers 1
Maybe I'm missing it but you don't seem to be calling InitializeComponent() anywhere.
Something like
public LoginView() { InitializeComponent(); } 
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