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POWPF TextBox displayed value is not equal to TextBox.Text
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copied!<p>I check the postal code for about 60 countries. The user enters a postal code which is checked against the rules for that country. The US is an exception where I can auto-fill the value based on other street address information already entered. In some ways it's basically an auto-correction feature. The problem is the auto-filled value never re-displays if it matches the previous .Text value - the 'erroneous' zip code just entered by the user remains displayed!</p> <p>For example, field contains "12345", user deletes the "5", my property setter puts the value back to "12345", the binding getter returns "12345" (and at this point my _TextChanged event fires) but WPF still displays the user edited text "1234"!</p> <p>How do I force WPF to redisplay the value?</p> <p>To simplify the example I have hard-coded the ZipCode value (in the app it is computed in a separate method):</p> <pre><code>public String ZipCode { get { return _address.ZipCode; } set { _address.ZipCode = "12345"; RaisePropertyChanged("ZipCode"); } } </code></pre> <p>Here is the XAML:</p> <pre><code><TextBox Name="ZipBox" Text="{Binding Path=ZipCode, UpdateSourceTrigger=PropertyChanged}" TextChanged="ZipBox_TextChanged" /> </code></pre> <p>WPF knows the field changed cause it always fires this event. But none of those methods force WPF to correctly display "12345".</p> <pre><code>private void ZipBox_TextChanged(object sender, TextChangedEventArgs e) { ZipBox.InvalidateVisual(); ZipBox.InvalidateMeasure(); ZipBox.UpdateLayout(); } </code></pre> <p>Edit: I also have created a custom static extension method .Refresh(this UIElement uiElement) which calls UIElement.Dispatcher.Invoke() and that also does not force the redraw.</p>

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