CODEWITHSUNDEEP
c#wpfwindows-phone-8data-bindingmvvm
ForeverLearning
ForeverLearning

Reputation: 1037

Cant refresh longlistselector in WP8 Databinding

I'm having some trouble with databinding to a LongListSelector. When I initally run this method, it works. The data is binded and everything is good.

The problem is when I press the refresh button, my app fetches a new JSON feed, parses it and tries to bind it. My app seems to download the JSON and stuff, but doesn't refresh the UI. Where have I gone wrong?

I've tried BoardLongList.ItemsSource = null; and BoardLongList.ItemsSource.Clear(); to no avail.

Any ideas? The JObject is from newtonsoft.json and the RootObject is from ViewModels.RootObject.

Thanks in advance!

private void Bind(JObject rootObject)
{
    string rootObjectString = rootObject.ToString();                   
    RootObject obj = JsonConvert.DeserializeObject<RootObject>(rootObjectString);

    // Bind to LongListSelector
    BoardLongList.ItemsSource = obj.Movements;
}

My XAML:

<phone:LongListSelector Grid.Row="1" x:Name="BoardLongList" Margin="0,0,-12,1" ItemsSource="{Binding Movement}">
    <phone:LongListSelector.ItemTemplate >
        <DataTemplate>
            <StackPanel Orientation="Horizontal" Margin="2" Height="50">
                <Grid>
                    <Grid.ColumnDefinitions>
                         <ColumnDefinition Width="80" />
                         <ColumnDefinition Width="200" />
                         <ColumnDefinition Width="100" />
                         <ColumnDefinition Width="120" />
                     </Grid.ColumnDefinitions>
                     <TextBlock Grid.Column="0"  Text="{Binding A1}" />
                     <TextBlock Grid.Column="1"  Text="{Binding A2}" />
                     <TextBlock Grid.Column="2"  Text="{Binding A3}" />
                     <TextBlock Grid.Column="3"  Text="{Binding A4}" />
                 </Grid>
             </StackPanel>
         </DataTemplate>
     </phone:LongListSelector.ItemTemplate>
</phone:LongListSelector>

Upvotes: 0

Views: 149

Answers (3)

ForeverLearning
ForeverLearning

Reputation: 1037

I finally figured it out. It was because of C# web caching my request. Not because of my databinding!

Upvotes: 0

Kulasangar
Kulasangar

Reputation: 9434

Did you try the pull to refresh feature?

Check this out!

You can accomplish this with the ItemRealized event and using a ListHeader(or ListFooter to pull from bottom). Within the ItemRealized event you check if the item is your header object. If it is then load more items.

Hope it helps.

Upvotes: 0

Sajeetharan
Sajeetharan

Reputation: 222582

Is your ItemsSource an ObservableCollection?.ObservableCollection is collection with notification that when something is changed in the collection, it notifies the UI.

Make obj.Movements an ObservableCollection

Upvotes: 1

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