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POHow to calculate a value in WPF Binding
 

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    <p>I have an app which uses two sliders to generate a product used elsewhere in the code. What I would like is to have the product value bound to a textblock or tooltip, for example, to look something like "10 x 15 = 150".</p> <p>The first part is easy, and looks like this:</p> <pre><code>&lt;TextBlock.Text&gt; &lt;MultiBinding StringFormat="{}{0} x {1}"&gt; &lt;Binding ElementName="amount_slider" Path="Value" /&gt; &lt;Binding ElementName="frequency_slider" Path="Value"/&gt; &lt;/MultiBinding&gt; &lt;/TextBlock.Text&gt; </code></pre> <p>But what's a nice easy way to get the product in there as well?</p> <p>Using Pavlo Glazkov's solution, I modified it to look like this:</p> <pre><code>public class MultiplyFormulaStringConverter : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { var doubleValues = values.Cast&lt;double&gt;().ToArray(); double x = doubleValues[0]; double y = doubleValues[1]; var leftPart = x.ToString() + " x " + y.ToString(); var rightPart = (x * y).ToString(); var result = string.Format("{0} = {1}", leftPart, rightPart); return result; } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } </code></pre> <p>And the all-important </p> <pre><code>&lt;Window.Resources&gt; &lt;local:MultiplyFormulaStringConverter x:Key="MultiplyFormulaStringConverter"/&gt; &lt;/Window.Resources&gt; </code></pre> <p>Thanks!</p>
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