CODEWITHSUNDEEP
wpfdata-bindingcheckboxlistboxc#-3.0
Konrad Morawski
Konrad Morawski

Reputation: 8404

Checked ListBox (WPF)

I can't get a checked ListBox to work.

My business object (it's a private/nested class, hence the lower-case)

    class shop : System.ComponentModel.INotifyPropertyChanged
    {
        internal int id;
        string _name;
        internal string name
        {
            get { return _name; }
            set
            {
                _name = value;
                if (PropertyChanged != null) PropertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs("name"));
            }
        }

        bool _selected;
        internal bool selected
        {
            get { return _selected; }
            set
            {
                _selected = value;
                if (PropertyChanged != null) PropertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs("selected"));
            }
        }
    }

My XAML:

<ListBox ItemsSource="{Binding}" Grid.Row="1" HorizontalAlignment="Stretch" Margin="10,0,10,0" Name="lbSelectedShops" VerticalAlignment="Stretch">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <CheckBox Width="Auto" Content="{Binding Path=name}" IsChecked="{Binding Path=selected, Mode=TwoWay}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>                                
</ListBox>

Databinding in code behind is very simple:

lbSelectedShops.ItemsSource = _shops;

where _shops is an ObservableCollection<shop> (containing two elements).

What I get is two blank checkboxes in the listbox (no captions, and both ticked off, even though selected is set to true for all items in the ItemsSource).

I'm really frustrated already and I'm sure it must be something very trivial. What is wrong here?

Upvotes: 3

Views: 2136

Answers (2)

Jehof
Jehof

Reputation: 35554

Binding work only with public properties (and public classes)

Upvotes: 3

nemesv
nemesv

Reputation: 139798

It's not working because your properties are internal and for Databinding you need public properties.
From MSDN (Binding Sources Overview):

You can bind to public properties, sub-properties, as well as indexers, of any common language runtime (CLR) object. The binding engine uses CLR reflection to get the values of the properties. Alternatively, objects that implement ICustomTypeDescriptor or have a registered TypeDescriptionProvider also work with the binding engine.

Upvotes: 3

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