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To bridge the gap between string values and nonstring properties, the XAML parser needs to perform a conversion The conversion is performed by type converters, a basic piece of NET infrastructure that s existed since NET 10 Essentially, a type converted has one role in life it provides utility methods that can convert a specific NET data type to and from any other NET type, such as a string representation in this case The XAML parser follows two steps to find a type converter: 1 It examines the property declaration, looking for a TypeConverter attribute (If present, the TypeConverter attribute indicates what class can perform the conversion) For example, when you use a property such as Foreground, NET checks the declaration of the Foreground property If there s no TypeConverter attribute on the property declaration, the XAML parser checks the class declaration of the corresponding data type.

For example, the Foreground property uses a Brush object The Brush class (and its derivatives) use the BrushConverter because the Brush class is decorated with the TypeConverter(typeof(BrushConverter)) attribute declaration..

If there s no associated type converter on the property declaration or the class declaration, the XAML parser generates an error. This system is simple but flexible. If you set a type converter at the class level, that converter applies to every property that uses that class. On the other hand, if you want to fine-tune the way type conversion works for a particular property, you can use the TypeConverter attribute on the property declaration instead.

[Browsable(true)] [DesignerSerializationVisibility( DesignerSerializationVisibility.Visible)] public string InformationCardFileName { get { return ((string) (base.GetValue( SaveInformationCardToFile.InformationCardFileNameProperty))); } set { base.SetValue( SaveInformationCardToFile.InformationCardFileNameProperty, value); } }

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It s technically possible to use type converters in code, but the syntax is a bit convoluted. It s almost always better to set a property directly not only is it faster, but it also avoids potential errors from mistyping strings, which won t be caught until runtime. (This problem doesn t affect XAML, because the XAML is parsed and validated at compile time.) Of course, before you can set the properties on a WPF element, you need to know a bit more about the basic WPF properties and data types a job you ll tackle in the next few chapters.

Let s demonstrate the drastic changes that can be made to controls using templating with an example. The default button structure is fairly boring and we are going to jazz it up a bit by making it look like a rounded rectangle, as shown in Listing 2 28. Listing 2 28. Altering an Individual Button s Appearance Using a ControlTemplate <StackPanel> <Button Content="Hello World!" Width="100" Height="30"> <Button.Template> <ControlTemplate> <Grid> <Rectangle Fill="{TemplateBinding Background}" RadiusX= "5" RadiusY="5" /> <Border BorderBrush="Black" BorderThickness="1"> <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" Content="{TemplateBinding Button.Content}" /> </Border>

Note XAML, like all XML-based languages, is case-sensitive. That means you can t substitute <button> for

<Button>. However, type converters usually aren t case-sensitive, which means both Foreground="White" and Foreground="white" have the same result.

As handy as type converters are, they aren t practical for all scenarios. For example, some properties are full-fledged objects with their own set of properties. Although it s possible to create a string representation that the type converter could use, that syntax might be difficult to use and prone to error. Fortunately, XAML provides another option: property-element syntax. With property-element syntax, you add a child element with a name in the form Parent.PropertyName. For example, the Grid has a Background property that allows you to supply a brush that s used to paint the area behind the controls. If you want to use a complex brush one more advanced than a solid color fill you ll need to add a child tag named Grid.Background, as shown here: <Grid Name="grid1"> <Grid.Background> ... </Grid.Background> ... </Grid> The key detail that makes this work is the period (.) in the element name. This distinguishes properties from other types of nested content. This still leaves one detail namely, once you ve identified the complex property you want to configure, how do you set it Here s the trick. Inside the nested element, you can add another tag to instantiate a specific class. In the eight ball example (shown in Figure 2-1), the background is filled with a gradient. To define the gradient you want, you need to create a LinearGradientBrush object. Using the rules of XAML, you can create the LinearGradientBrush object using an element with the name LinearGradientBrush: <Grid Name="grid1"> <Grid.Background> <LinearGradientBrush> </LinearGradientBrush> </Grid.Background> ... </Grid>

protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext) { if (InformationCardPath.Substring( InformationCardPath.Length - 1) != "\\") InformationCardPath += "\\"; string filename = InformationCardPath + InformationCardFileName; ManagedCardHelper helper = new ManagedCardHelper(); helper.SaveInformationCard(SignedInformationCard, filename); return base.Execute(executionContext); } } } The InformationCardPath property will determine the directory in the file system where information cards should be stored.

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