Help DataBinding to Checkbox in WPF

I have a CheckBox in a ListBox. I set the ListBox ItemsSource to a List of Agency. Agency has a property

public class Agency 
{ 
  public bool isSelected { get; set;} 
}

<ListBox> <!-- ItemsSource set in codebehind to List<Agency> -->
    <CheckBox IsChecked="{Bindin开发者_如何学JAVAg Path=isSelected, Mode=TwoWay}" />
</ListBox>

I have a function to check all the checkboxes

//SelectAll button

    private void SelectAll_Click(object sender, RoutedEventArgs e)
    {
      List<Agency> list = this.AgencySubListBox.ItemsSource as List<Agency>;
      for (int i = 0; i < list.Count; i++)
      {
        Agency d = list[i];
        d.isSelected = true;
      }
    }

When I hit the select all button I expect the checkboxes to all be checked. But nothing happens.

---

You have to implement INotifyPropertyChanged for your Agency-class. Then in your isSelected-Property, call PropertyChanged if the value of the property has been changed. Auto-properties as you used in your example do not support INotifiyPropertyChanged, therefore you can not use them for your purpose. If you work with .net, I would also recommend to start the property names with upper case. This is the widely accepted standard.

---

You should make your model implement INotifyPropertyChanged, and implement it

---

There is nothing to tell the UI that the your checkbox binding has been invalidated, and needs rechecking. Therefore, implement INotifyPropertyChanged on your Agency type.