WPF bind ComboBox with CheckBox

Question

I would like to bind a ComboBox with a CheckBox so that the ComboBox is enabled when the CheckBox is not checked . Can I do that directly in the xaml file, without adding any additional variable in the code?
In the code below, myComboBox is enabled when myCheckBox is ckecked .

<ComboBox Name="myComboBox" SelectedIndex="0" 
     IsEnabled="{Binding ElementName=myCheckBox, Path=IsChecked}">

Answer 1

You need a converter to convert the Boolean values to it's inverted value. In order to do that first create a class the inherits from IValueConverter like this:

public sealed class InvertedBooleanConverter : IValueConverter
{
    public Object Convert( Object value, Type targetType, Object parameter, CultureInfo culture )
    {
        if ( value is Boolean )
        {
            return (Boolean)value ? false : true;
        }

        return null;
    }


    public Object ConvertBack( Object value, Type targetType, Object parameter, CultureInfo culture )
    {
        throw new NotImplementedException();
    }
}

Then you need to add the converter in the resources like this:

<Window.Resources>
    <local:InvertedBooleanConverter x:Key="InvertedBooleanConverter" />
</Window.Resources>

And lastly just add the converter to the binding like this:

<ComboBox Name="myComboBox"
          SelectedIndex="0"
          IsEnabled="{Binding ElementName=myCheckBox, Path=IsChecked, Converter={StaticResource InvertedBooleanConverter}}">