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LongListSelector ItemsSource not working RRS feed

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    Also Can be seen at;

    http://stackoverflow.com/questions/29188982/longlistselector-itemssource-not-working

    In my Windows Phone 8.1 store app I am having trouble to show values in LongListSelector. Here is .xaml and .cs files.

    Am I missing something?

    <controls:LongListSelector Grid.Row="0" Grid.Column="0"  VerticalAlignment="Stretch" 
                                           DataContext="{Binding ElementName=PageWorld}"
                                           ItemsSource="{Binding Countries}"  RenderTransformOrigin="0.5,0.5" BorderBrush="Blue" BorderThickness="2">
                    <controls:LongListSelector.RenderTransform>
                        <CompositeTransform/>
                    </controls:LongListSelector.RenderTransform>
                    <controls:LongListSelector.ItemTemplate>
                        <DataTemplate>
                            <ListBoxItem Margin="0,6,0,6">
                                <StackPanel>
                                    <TextBlock Text="{Binding Title}" TextWrapping="NoWrap"  Foreground="Black"/>
                                </StackPanel>
                            </ListBoxItem>
                        </DataTemplate>
                    </controls:LongListSelector.ItemTemplate>
                </controls:LongListSelector>

    In code behing I am binding values as follows.

    private ObservableCollection<Country> _countries;

        public ObservableCollection<Country> Countries
        {
            get { return _countries; }
            set
            {
                _countries = value;
                OnPropertyChanged();
            }
        }

        public World()
        {
            InitializeComponent();
            navigationHelper = new NavigationHelper(this);
            navigationHelper.LoadState += this.NavigationHelper_LoadState;
            navigationHelper.SaveState += this.NavigationHelper_SaveState;
            Countries = GetCountries();
        }

 public class Country
        {
            public string Title { get; set; }
        }
        private ObservableCollection<Country> GetCountries()
        {
            ObservableCollection<Country> countries = new ObservableCollection<Country>();
            for (int i = 0; i < 100; i++)
            {
                Country country = new Country();
                country.Title = "Name" + i;
                countries.Add(country);
            }
            return countries;
        }
    Thursday, March 26, 2015 9:06 PM

Answers

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    Hi reyou,

    With only code snippet I cannot successfully debugging the app, could you provide more information about your project for instance you could share a repro demo for us.

    Simply create a test project by your code, looks like the issue is on your data source binding.

    I've change the code like below, works fine now:

    //remove DataContext and ItemSource since I don't know how you implement this
    <phone:LongListSelector x:Name="list" VerticalAlignment="Stretch" 
           RenderTransformOrigin="0.5,0.5" BorderBrush="Blue" BorderThickness="2" Margin="10,10,0,0">
                <phone:LongListSelector.RenderTransform>
                    <CompositeTransform/>
                </phone:LongListSelector.RenderTransform>
                <phone:LongListSelector.ItemTemplate>
                    <DataTemplate>
                        <ListBoxItem Margin="0,6,0,6">
                            <StackPanel Background="Blue">
                                <TextBlock Text="{Binding Title}" TextWrapping="NoWrap"  Foreground="Black"/>
                            </StackPanel>
                        </ListBoxItem>
                    </DataTemplate>
                </phone:LongListSelector.ItemTemplate>
            </phone:LongListSelector>

    In the backend cs file:

                InitializeComponent();
                Countries = GetCountries();
            // manually binding the Countries to XAML.
            list.ItemsSource = Countries;
    --James

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    Friday, March 27, 2015 7:57 AM
    Moderator