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For those classes that implement the PropertyChanged event, it makes sense to write a small helper method that simplifies firing the event Such a helper method, called OnPropertyChanged, is shown in Listing 4 7 Listing 4 7 Common OnPropertyChanged Helper protected void OnPropertyChanged(string propertyName) { If(PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } You can then fire the event within the class or, due to the protected accessor, its subclasses simply by calling this method with the name of the property that has changed However, be careful to call the method only if the property in question has changed, as shown in Listing 4 8 Listing 4 8.

To use this converter, begin by adding it to the Resources. In this example, the ImageDirectory property is not set, which means the ImagePathConverter defaults to the current application directory: <Window.Resources> <local:ImagePathConverter x:Key="ImagePathConverter"></local:ImagePathConverter> </Window.Resources> Now it s easy to create a binding expression that uses this value converter: <Image Margin="5" Grid.Row="2" Grid.Column="1" Stretch="None" HorizontalAlignment="Left" Source= "{Binding Path=ProductImagePath, Converter={StaticResource ImagePathConverter}}"> </Image> This works because the Image.Source property expects an ImageSource object, and the BitmapImage class derives from ImageSource. Figure 20-3 shows the result.

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You might improve this example in a couple of ways. First, attempting to create a BitmapImage that points to a nonexistent file causes an exception, which you ll receive when setting the DataContext, ItemsSource, or Source property. Alternatively, you can add properties to the ImagePathConverter class that allow you to configure this behavior. For example, you might introduce a Boolean SuppressExceptions property. If set to true, you could catch exceptions in the Convert() method and then return the Binding.DoNothing value (which tells WPF to temporarily act as though no data binding is set). Or, you could add a DefaultImage property that takes a placeholder BitmapImage. The ImagePathConverter could then return the default image if an exception occurs. You ll also notice that this converter supports only one-way conversion. That s because it s not possible to change the BitmapImage object and use that to update the image path. However, you could

take an alternate approach. Rather than return a BitmapImage from the ImagePathConverter, you could simply return the fully qualified URI from the Convert() method, as shown here: return new Uri(imagePath); This works just as successfully, because the Image element uses a type converter to translate the Uri to the ImageSource object it really wants. If you take this approach, you could then allow the user to choose a new file path (perhaps using a TextBox that s set with the help of the OpenFileDialog class). You could then extract the file name in the ConvertBack() method and use that to update the image path that s stored in your data object.

Some of the most interesting value converters aren t designed to format data for presentation. Instead, they re intended to format some other appearance-related aspect of an element based on a data rule. For example, imagine you want to flag high-priced items by giving them a different background color. You can easily encapsulate this logic with the following value converter: public class PriceToBackgroundConverter : IValueConverter { public decimal MinimumPriceToHighlight { get; set; } public Brush HighlightBrush { get; set; } public Brush DefaultBrush { get; set; } public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { decimal price = (decimal)value; if (price >= MinimumPriceToHighlight) return HighlightBrush; else return DefaultBrush; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotSupportedException(); } }

Microsoft is also providing support in the form of .NET namespaces and Windows Communication Foundation (WCF) support.

Once again, the value converter is carefully designed with reusability in mind. Rather than hardcoding the color highlights in the converter, they re specified in the XAML by the code that uses the converter: <local:PriceToBackgroundConverter x:Key="PriceToBackgroundConverter" DefaultBrush="{x:Null}" HighlightBrush="Orange" MinimumPriceToHighlight="50"> </local:PriceToBackgroundConverter> Brushes are used instead of colors so that you can create more advanced highlight effects using gradients and background images. And if you want to keep the standard, transparent background (so the background of the parent elements is used), just set the DefaultBrush or HighlightBrush property to null, as shown here. Now all that s left is to use this converter to set the background of some element, like the Border that contains all the other elements: <Border Background= "{Binding Path=UnitCost, Converter={StaticResource PriceToBackgroundConverter}}" ... >

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