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CHAPTER 4 XAML
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The Default Content Property
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Many WPF visual elements display content to the user, such as the label on a button. I ll describe content in more detail in 6, but for our current discussion of XAML, you need to know the following: Every WPF class that can have content has a property that is specified as its default content holder. I mentioned this a bit earlier when describing the content section of the element syntax. This default content property is specified using the ContentPropertyAttribute attribute in the class declaration. (This is a .NET attribute, not a XAML attribute.)
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The declaration of the default content holder might not be on the class itself, however. You might have to burrow down the inheritance tree a bit to find it. For example, if you go to the documentation for the WPF Button class, you won t find mention of this attribute. But if you go down past the ButtonBase class to the ContentControl class and look at the C# section, you ll find the following declaration. The parameter of the attribute contains the string "Content", which specifies that for all classes derived from this one, it is the Content property that is the default content holder.
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[ContentPropertyAttribute("Content")] public class ContentControl : Control, IAddChild { ...
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Different classes have different default content holder properties. For example, if you were to drill down from the ListBox control to its base class ItemsControl, you d find that the ContentProperty in this case is the Items property. For simple content, rather than placing content between the start tag and the end tag, you could use attribute syntax. For example, the following markup shows four button instantiations that are semantically equivalent. They all produce identical buttons. The first button instantiation uses simple object element syntax, with the content between the start and end tags. The second puts the content in the start tag by using attribute syntax. The third does the same as the second but uses the empty element syntax for the start tag. The fourth is the same as the third except that it includes the class name as part of the attribute name. <StackPanel> <Button>Click Me</Button> Object Element Syntax <Button Content="Click Me"></Button> Attribute Syntax <Button Content="Click Me"/> Attribute Syntax, Empty Element <Button Button.Content="Click Me"/> </StackPanel> Attribute Syntax, Empty Element, Qualified Name
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CHAPTER 4 XAML
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Type Converters for Attributes
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If you look at the attribute in the following line of markup, you might notice something puzzling. From 3 you know that the Background property of a Button must be set with an object derived from the Brush class, but the attribute sets it with the simple string "Blue". As a matter of fact, attribute syntax requires that attributes be set with strings. <Button Background="Blue"> ... So, how can you assign a string to a property that requires some other type The short answer is that the XAML parser converts it for you. The parser uses the class and property name to check the type of the property, and uses a TypeConverter for that type to convert the string to an object of the type required by the property. Figure 4-9 illustrates the process.
Figure 4-9. The XAML parser converts the string value assigned to the attribute to the object type required by the property.
CHAPTER 4 XAML
Property Element Syntax
So far, you ve seen classes as elements and properties as attributes. That s a very clean classification, but it s not always possible to use something as simple as an attribute for a property. To address this, XAML also provides another syntax for setting the values of more complex properties. This is called property element syntax, and has the following characteristics: The property is listed, not as an attribute inside the start tag, but using element syntax nested in the content part of the object element. The element name uses a two-part name in dot-syntax notation. The name consists of the class name and the property name, separated by a period (dot), as shown in the following syntax code:
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