Help DataBinding to Checkbox in WPF

Question

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="{Binding 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.

PeterB · Accepted Answer · 2011-06-07 16:09:30Z

1

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.

edited Jun 7, 2011 at 16:09

answered Jun 7, 2011 at 16:04

PeterB

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Felice Pollano · Accepted Answer · 2011-06-07 16:04:30Z

1

You should make your model implement INotifyPropertyChanged, and implement it

answered Jun 7, 2011 at 16:04

Felice Pollano

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Comments

devdigital · Accepted Answer · 2011-06-07 16:05:04Z

1

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.

answered Jun 7, 2011 at 16:05

devdigital

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