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POWPF Binding to textbox not updating
 

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    <p>I have am writing a WPF application, and I have a textbox for the user to enter a frames per second value for video playback. The value of this textbox is bound to a dependency property in the code behind (trying to follow MVVM like a good designer). My problem is that the textbox is not updating automatically when the FPS value is changed externally. For example, the user can control the value using a slider. The dependency properties value is changed correctly by the slider, but the textboxes text never updates, unless, of course, i do it manualy using GetBindingExpression(..).UpdateTarget() which is what I have implemented pending a better solution. Does anyone know if this is intended functionality or am I setting something up wrong?</p> <p>Thanks, Max</p> <p>TextBox tag in XAML:</p> <pre><code>&lt;TextBox Text="{Binding FPS}" Name="tbFPS" FlowDirection="RightToLeft"/&gt; </code></pre> <p>Code behind for dependency property:</p> <pre><code> #region public dependency property int FPS public static readonly DependencyProperty FPSProperty = DependencyProperty.Register("FPSProperty", typeof(int), typeof(GlobalSettings), new PropertyMetadata(MainWindow.appState.gSettings.fps,FPSChanged,FPSCoerce), FPSValidate); public int FPS { get { return (int)GetValue(FPSProperty); } set { SetValue(FPSProperty, value); } } private static bool FPSValidate(object value) { return true; } private static object FPSCoerce(DependencyObject obj, object o) { return o; } private static void FPSChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e) { //why do i need to update the binding manually? isnt that the point of a binding? // (obj as GlobalSettings).tbFPS.GetBindingExpression(TextBox.TextProperty).UpdateTarget(); } #endregion </code></pre>
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