WPF Binding - Default value for empty string

Question

Is there a standard way to set a default or fallback value for a WPF binding if the bound string is empty?

Answer 1

You should create a converter for this, which implements IValueConverter

public class StringEmptyConverter : IValueConverter {

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
      return string.IsNullOrEmpty((string)value) ? parameter : value;
    }

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

}

Then in xaml you'd just provide the converter to the binding, (xxx just represents your Window / UserControl / Style ... where the binding is)