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POMultibinding: two colums to one column
 

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  1. POMultibinding: two colums to one column
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    <p>I have a table which has two columns <code>ValueA</code> and <code>ValueB</code>. I need to show the table in a grid, but I need to show either <code>ValueA</code> or <code>ValueB</code>, but not both. So if <code>ValueA</code> doesn't have a value, then <code>ValueB</code> is shown and vice versa. When user enters a value to the column, only <code>ValueA</code> should be updated. So <code>ValueB</code> in kind of a default value (it's update in another part of the program).</p> <p>I've tried to resolve this problem using <code>MultiBinding</code>, but I've only managed to <em>show</em> the values. The value user enters to the grid always gets overwritten by the original value.</p> <p>I have created a converter named <code>ValueAValueBConverter</code> that has a Convert method like this:</p> <pre><code>public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (values[0] != DependencyProperty.UnsetValue &amp;&amp; values[0] != null &amp;&amp; !string.IsNullOrEmpty(values[0].ToString())) { Debug.WriteLine("values 0: " + values[0]); return values[0].ToString(); } if (values[1] != DependencyProperty.UnsetValue &amp;&amp; values[1] != null &amp;&amp; !string.IsNullOrEmpty(values[1].ToString())) { Debug.WriteLine("values 1: " + values[1]); return values[1].ToString(); } return null; } </code></pre> <p>And a ConvertBack method (which never gets called):</p> <pre><code>public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) { return new object [] { value, value }; } </code></pre> <p>The XAML of the bound colums looks like this:</p> <pre><code>&lt;toolkit:DataGridTextColumn Width="2*" Header="{x:Static localProperties:Resources.TValuesAB}"&gt; &lt;toolkit:DataGridTextColumn.Binding&gt; &lt;MultiBinding Converter="{StaticResource myValueAValueBConverter}" Mode="TwoWay"&gt; &lt;Binding Path="ValueA" UpdateSourceTrigger="PropertyChanged" /&gt; &lt;Binding Path="ValueB" UpdateSourceTrigger="PropertyChanged" /&gt; &lt;/MultiBinding&gt; &lt;/toolkit:DataGridTextColumn.Binding&gt; &lt;/toolkit:DataGridTextColumn&gt; </code></pre> <p>Should I do this in the ViewModel (we're using MVVM pattern) or is there any other way to do this with XAML?</p>
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