WPF binding doesn't work

Question

I have simplified example:

XAML:

<CheckBox IsChecked="{Binding Path=IsSelected, Mode=TwoWay}" Name="cb" />
<Button Name="button1" Click="button1_Click" />

Code behind:

public partial class MainWindow : Window
{
    private ObservableCollection<MyObject> collection = new ObservableCollection<MyObject>();

    public MainWindow()
    {
        InitializeComponent();

        collection.Add(new MyObject(true));
        //grid.DataContext = collection[0];
    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        collection[0].IsSelected = false;
    }
}

public class MyObject
{
    public bool IsSelected { get; set; }

    public MyObject(bool isSelected)
    {
        this.IsSelected = isSelected;
    }
}

The cb.IsChecked doesn't change by button clicking though the collection[0].IsSelected is changed.

Even if I uncomment grid.DataContext = collection[0]; - nothing changed.

In real example I have the same checkbox in the item template of a listbox. So the behaviour is the same - the selection of checkboxes don't change.

Nikolay · Accepted Answer · 2012-04-28 06:29:38Z

3

You need to implement INotifyPropertyChanged on your MyObject type

answered Apr 28, 2012 at 6:29

Nikolay

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Denny · Accepted Answer · 2012-04-28 07:23:21Z

2

Please try the following codes:

public class MyObject : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged(string info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }

    private bool _isSelected;

    public bool IsSelected
    {
        get { return _isSelected; }
        set
        {
            _isSelected = value;
            NotifyPropertyChanged("IsSelected");
        }
    }

    public MyObject(bool isSelected)
    {
        this.IsSelected = isSelected;
    }
}

answered Apr 28, 2012 at 7:23

Denny

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