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POaltering the value of a Dependency Property in WPF
 

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  1. POaltering the value of a Dependency Property in WPF
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    <p>We have a custom WPF control with multiple <code>TextBox</code>. Each <code>TextBox</code> has its <code>Text</code> property bound to a dependency property on our custom control (using the <code>generic.xaml</code> template). We would like to <strong>alter</strong> the value entered in the <code>TextBox</code> inside our custom control if the data provided is incorrect. We know we can use validation to accept or reject a value, but that would not meet our needs since we just want to slightly alter the value.</p> <p>For example, if the user enters <code>11</code> in a particular <code>TextBox</code> we want to update it to <code>2011</code>. Or we want to capitalize the value of one of the <code>TextBox</code> regardless of what the user enters.</p> <p>We cannot seem to find the proper WPF dependency property mechanism to perform this cleanly. We tried the CooerceCallback, but it will not update the <code>TextBox</code> that initiated the change in the dependency property. Other controls that are bound to that dependency property will get the modified value, but not the caller.</p> <p>One idea we had was to change the recommended default "property template" to do more than just <code>SetValue(property, value)</code>. So an example would be:</p> <pre><code>public string Year { get { return (string)GetValue(YearProperty);} { set { var newVal = UpdateValue(value); SetValue(YearProperty, newVal); } } </code></pre> <p>But that does not work as binding with dependency properties will NOT use the underlying .Net property but use SetValue() directly.</p> <p>If I have not confused everybody with this question, I would appreciate any help.</p> <p>Regards,</p> <p>Eric.</p> <p>PS: We are using .Net 3.5 SP1</p>
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    1. USEric Liprandi
    1. USEric Liprandi
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    1. COpossible duplicate of [WPF Dependency Property Coercion binding issues](http://stackoverflow.com/questions/3003546/wpf-dependency-property-coercion-binding-issues)
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    2. COThanks @CodeNaked, I must not have been searching with the right keywords as that answer never came up. But you are correct. We had already implemented the `UpdateTarget()` solution, but the behavior is fixed in .Net 4.0
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