Cannot bind a object list into toolkit LongListSelector Windows Phone 7

Question

I want to bind list of objects to toolkit LongListSelector Windows Phone 7 as what i do in Windows Phone 8. Anyone could tell my where's wrong?

Nothing show in the LongListSelector

XAML

<toolkit:LongListSelector Name="MyLLS">
    <toolkit:LongListSelector.ItemTemplate>
        <DataTemplate>
            <Grid Background="‪#‎4A6EA9‬" Height="60" Margin="2">
                <TextBlock Text="{Binding Title}"/>
            </Grid>
        </DataTemplate>
    </toolkit:LongListSelector.ItemTemplate>
</toolkit:LongListSelector>

Class

public class NewsItem
{
    public string Link { get; set; }
    public string Title { get; set; }
}


MainPage()
{
    // something already
    MyLLS.ItemsSource = new List<NewsItem> { 
        new NewsItem { Link = "http://google.com", Title= "Google Search" }
    };
}

Romasz · Accepted Answer · 2014-02-10T10:53:28.667

1

I've not played much with WP7 ToolKit but I've managed to display list like this:

In XAML - removed Grid and added isFlatList:

<toolkit:LongListSelector Name="MyLLS" IsFlatList="True">
    <toolkit:LongListSelector.ItemTemplate>
        <DataTemplate>
              <TextBlock Text="{Binding Title}"/>
        </DataTemplate>
    </toolkit:LongListSelector.ItemTemplate>
</toolkit:LongListSelector>

In code behind:

ObservableCollection<NewsItem> myList = new ObservableCollection<NewsItem>();

MainPage()
{
    InitializeComponent();
    // something already
    MyLLS.ItemsSource = myList;
    myList.Add(new NewsItem { Link = "http://google.com", Title= "Google Search" });
}

I haven't got much time to play with the code above, but maybe it will help. I would advise to read some tutorials - WP7 LongListSelector in depth Part1, WP7 LongListSelector in depth Part2 and probably more.

edited Feb 10 '14 at 10:53

answered Feb 10 '14 at 09:46

Romasz

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Not works. I know how to bind data on Windows Phone 8, but there is a different on Windows Phone 7 (toolkit:LongListSelector) can not do the same – HelloWindowsPhone Feb 10 '14 at 10:04
@iexplore I've edited my code and as I've tested it at least display List. As I've written - beacause of the lack of time - it is like this, but maybe will help a little. – Romasz Feb 10 '14 at 10:55
Just add IsFlatList="True" and problem solved. Not need ObservableCollection instead List. Thanks for your useful help – HelloWindowsPhone Feb 10 '14 at 11:07
@iexplore List or ObservableCollection depends on your code, and you are right that in simple cases List can be sufficient. – Romasz Feb 10 '14 at 11:26

Chris Shao · Answer 2 · 2014-02-10T09:54:03.733

0

I think you should do InitializeComponent(); first in MainPage constrator.

MainPage()
{
    // Init method must work
    InitializeComponent(); 
    // something already
    MyLLS.ItemsSource = new ObservableCollection<NewsItem> { 
        new NewsItem { Link = "http://google.com", Title= "Google Search" }
    };
}

edited Feb 10 '14 at 09:54

answered Feb 10 '14 at 04:58

Chris Shao

8,231
3
39
37

You could trying move dataBind to onNavigatedTo or Loaded method. – Chris Shao Feb 10 '14 at 09:39
not working, i try exactly the same in Windows Phone 8, it works. But not when move to Windows Phone 7 – HelloWindowsPhone Feb 10 '14 at 10:02

Cannot bind a object list into toolkit LongListSelector Windows Phone 7

2 Answers2