How to enable wpf controls through data binding on a selected item from a combo box

[User 2970611]

I am looking for a way where a control can be enable when an item from a combo box is selected. Is there a simple way through data binding when a user selects an item from a combo box that it then enables another control to be used?

[Mark Salsbery]

One way is to bind IsEnabled on the control(s) to the ComboBox SelectedIndex or SelectedItem property using a value converter[^] on the binding to convert the Selectedxxx value to a bool.

\[System.Windows.Data.ValueConversion(typeof(int), typeof(bool))\]
public class SelectedIndexToIsEnabledConverter : System.Windows.Data.IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return ((int)value >= 0) ? true : false;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new System.NotImplementedException();
    }
}

<UserControl.Resources >
    <local:SelectedIndexToIsEnabledConverter x:Key="SelectedIndexToIsEnabledConverter" />
</UserControl.Resources>

...

Example binding:
IsEnabled="{Binding Path=SelectedIndex,ElementName=comboBox1,Converter={StaticResource SelectedIndexToIsEnabledConverter},Mode=OneWay}"

Mark Salsbery Microsoft MVP - Visual C++ :java:

modified on Friday, July 15, 2011 12:33 PM