help me with Converter please

Question

I'm trying to bind element's Height value to Checkbox.IsChecked property. Why that's not working?

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

<Button Name="JustBtn" Content="Hello World"/>
      <CheckBox IsChecked="{Binding ElementName=JustButton, Path=Height, Converter=BoolToHeightConverter}" />


[ValueConversion(typeof(Nullable<bool>), typeof(double))]
public class BoolToHeightConverter : IValueConverter
{

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return double.NaN;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return null;
    }
}

It doesn't even initalize the window. Says: 'IValueConverter' type does not have a public TypeConverter class

Answer 1

There are a couple of problems. First, it looks like you are trying to modify the Height property when the CheckBox is checked. If this is the case, you should implement your logic in the ConvertBack method of the converter, and specify a Mode on the Binding. Secondly, your Binding should use a StaticResource to reference your converter:

<CheckBox IsChecked="{Binding ElementName=JustButton, Path=Height, Converter={StaticResource BoolToHeightConverter}, Mode=OneWayToSource}" />

Answer 2

I'm sorry - my bad: I forgot to attach converter through StaticResource. Sorry guys...