Question

I have a column class which uses view model base to implement INotifyPropertyChanged (lazy I know):

public class Column : ViewModelBase
{
    public string ColumnName { get; set; }
    public bool Anonymize { get; set; }
}

And then a list of columns:

public class Columns : ObservableCollection<Column>
{
}

In my view model I have a property columns and I am binding that to a combo box with a checkbox and textblock:

private Columns _tableColumns;
public Columns TableColumns
{
  get
  {
    return _tableColumns;
  }
  set
  {
    _tableColumns = value;
    OnPropertyChanged("TableColumns");
  }
}

  <ComboBox Name="cbColumns" ItemsSource="{Binding TableColumns}">
    <ComboBox.ItemTemplate>
      <DataTemplate>
        <StackPanel Orientation="Horizontal">
          <CheckBox  IsChecked="{Binding Anonymize, Mode=TwoWay}" />
          <TextBlock Text="{Binding ColumnName}"/>
        </StackPanel>
      </DataTemplate>
    </ComboBox.ItemTemplate>
  </ComboBox>

When I change the Anonymize property through the checkbox on an item, how do make the Columns property change in the view model to reflect this?

Answer 1

Your Column class needs to implement INotifyPropertyChanged (which you say it does). You also need to raise that event it when the value of Anonymize changes (which you don’t).