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POMVVM- How can I bind to a property, which is not a DependancyProperty?
 

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  1. POMVVM- How can I bind to a property, which is not a DependancyProperty?
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    <p>I have found this question <a href="https://stackoverflow.com/questions/2245928/mvvm-and-the-textboxs-selectedtext-property">MVVM and the TextBox&#39;s SelectedText property</a>. However, I am having trouble getting the solution given to work. This is my non-working code, in which I am trying to display the first textbox's selected text in the second textbox.</p> <p><strong>View:</strong></p> <p>SelectedText and Text are just string properties from my ViewModel.</p> <pre><code>&lt;TextBox Text="{Binding Path=Text, UpdateSourceTrigger=PropertyChanged}" Height="155" HorizontalAlignment="Left" Margin="68,31,0,0" Name="textBox1" VerticalAlignment="Top" Width="264" AcceptsReturn="True" AcceptsTab="True" local:TextBoxHelper.SelectedText="{Binding SelectedText, UpdateSourceTrigger=PropertyChanged, Mode=OneWayToSource}" /&gt; &lt;TextBox Text="{Binding SelectedText, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}" Height="154" HorizontalAlignment="Left" Margin="82,287,0,0" Name="textBox2" VerticalAlignment="Top" Width="239" /&gt; </code></pre> <p><strong>TextBoxHelper</strong></p> <pre><code> public static class TextBoxHelper { #region "Selected Text" public static string GetSelectedText(DependencyObject obj) { return (string)obj.GetValue(SelectedTextProperty); } public static void SetSelectedText(DependencyObject obj, string value) { obj.SetValue(SelectedTextProperty, value); } // Using a DependencyProperty as the backing store for SelectedText. This enables animation, styling, binding, etc... public static readonly DependencyProperty SelectedTextProperty = DependencyProperty.RegisterAttached( "SelectedText", typeof(string), typeof(TextBoxHelper), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, SelectedTextChanged)); private static void SelectedTextChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e) { TextBox tb = obj as TextBox; if (tb != null) { if (e.OldValue == null &amp;&amp; e.NewValue != null) { tb.SelectionChanged += tb_SelectionChanged; } else if (e.OldValue != null &amp;&amp; e.NewValue == null) { tb.SelectionChanged -= tb_SelectionChanged; } string newValue = e.NewValue as string; if (newValue != null &amp;&amp; newValue != tb.SelectedText) { tb.SelectedText = newValue as string; } } } static void tb_SelectionChanged(object sender, RoutedEventArgs e) { TextBox tb = sender as TextBox; if (tb != null) { SetSelectedText(tb, tb.SelectedText); } } #endregion } </code></pre> <p>What am I doing wrong?</p>
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