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POSet of RadioButton controls setting a WPF DependencyProperty via Binding
 

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    <p>I am tring to create a simple UserControl that contains a set of RadioButtons and then sets a single DependencyProperty to a char value (each RadioButton has a unique char value associated with it). I'm taking my cue from this article <a href="http://wpftutorial.net/RadioButton.html" rel="nofollow">http://wpftutorial.net/RadioButton.html</a> which seemed to be an elegant solution, but I can't get it to work. Checking one of the RadioButtons does not change the Property. Neither of the ValueConverter's methods are ever called. There are no compile-time errors or binding errors at run-time. What am I missing?</p> <p>Here is my XAML:</p> <pre><code>&lt;UserControl x:Class="TestClientWpf.OrderTypePicker" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:TestClientWpf="clr-namespace:TestClientWpf"&gt; &lt;WrapPanel&gt; &lt;WrapPanel.Resources&gt; &lt;TestClientWpf:CharMatchToBooleanConverter x:Key="converter" /&gt; &lt;/WrapPanel.Resources&gt; &lt;RadioButton IsChecked="{Binding Path=OrderType, Mode=TwoWay, Converter={StaticResource converter}, ConverterParameter=1}"&gt;Type 1&lt;/RadioButton&gt; &lt;RadioButton IsChecked="{Binding Path=OrderType, Mode=TwoWay, Converter={StaticResource converter}, ConverterParameter=2}"&gt;Type 2&lt;/RadioButton&gt; &lt;RadioButton IsChecked="{Binding Path=OrderType, Mode=TwoWay, Converter={StaticResource converter}, ConverterParameter=3}"&gt;Type 3&lt;/RadioButton&gt; &lt;/WrapPanel&gt; &lt;/UserControl&gt; </code></pre> <p>My code behind:</p> <pre><code>public partial class OrderTypePicker { public static readonly DependencyProperty OrderTypeProperty = DependencyProperty.Register("OrderType", typeof(char), typeof(OrderTypePicker), new FrameworkPropertyMetadata('1')); public char OrderType { get { return (char)GetValue(OrderTypeProperty); } set { SetValue(OrderTypeProperty, value); } } public OrderTypePicker() { InitializeComponent(); } } </code></pre> <p>My ValueConverter:</p> <pre><code>public class CharMatchToBooleanConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if (value == null || parameter == null) return false; string checkValue = value.ToString(); string targetValue = parameter.ToString(); return checkValue.Equals(targetValue, StringComparison.InvariantCultureIgnoreCase); } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { if (value == null || parameter == null) return null; bool useValue = (bool)value; string targetValue = parameter.ToString(); return useValue ? char.Parse(targetValue) : (char?) null; } </code></pre>
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