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You will see many of these keywords in action where required in the chapters to come; however, by way of a simple example, consider the following XAML <Window> definition that makes use of the ClassModifier and FieldModifier keywords as well as x:Name and x:Class (remember that kaxaml.exe will not allow you to make use of any XAML keyword that entails code compilation, such as x:Code, x:FieldModifier, or x:ClassModifier): <!-- This class will now be declared internal in the *.g.cs file --> <Window x:Class="MyWPFApp.MainWindow" x:ClassModifier ="internal" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <!-- This button will be public in the *.g.cs file --> <Button x:Name ="myButton" x:FieldModifier ="public" Content = "OK"/> </Window> By default, all C#/XAML type definitions are public, while members default to internal. However, based on your XAML definition, the resulting autogenerated file contains an internal class type with a public Button tButton type: internal partial class MainWindow : System.Windows.Window, System.Windows.Markup.IComponentConnector { public System.Windows.Controls.Button myButton; ... }

Once you have established your root element and any required XML namespaces, your next task is to populate the root with a child element In a real-world WPF application, the child will be a layout manager (such as a Grid or StackPanel) which contains, in turn, any number of additional UI elements that describe the user interface The next chapter examines these layout managers in detail, so for now just assume that your <Window> type will contain a single Button element As you have already seen over the course of this chapter, XAML elements map to a class or structure type within a given NET namespace, while the attributes within the opening element tag map to properties or events of the type To illustrate, enter the following <Button> definition into kaxaml: <Page xmlns="http://schemasmicrosoftcom/winfx/2006/xaml/presentation" xmlns:x="http://schemasmicrosoft.

If there is an #element_validate property defined for an individual form element, the functions defined in the property are called and passed the $form_state and $element.

com/winfx/2006/xaml"> <Grid> <!-- Configure the look and feel of a Button --> <Button Height="50" Width="100" Content="OK!" FontSize="20" Background="Green" Foreground="Yellow"/> </Grid> </Page> Notice that the values assigned to each property have been captured as a simple text value This may seem like a complete mismatch of data types because if you were to make this Button in C# code, you would not assign string objects to these properties but would make use of specific data types For example, here is the same button authored in code: public void MakeAButton() { Button myBtn = new Button(); myBtnHeight = 50; myBtnWidth = 100; myBtnFontSize = 20; myBtnContent = "OK!"; myBtnBackground = new SolidColorBrush(ColorsGreen); myBtnForeground = new SolidColorBrush(Colors.

Yellow); } As it turns out, WPF ships with a number of type converter classes, which will be used to transform simple text values into the correct underlying data type This process happens transparently (and automatically) While this is all well and good, there will be many times when you need to assign a much more complex value to a XAML attribute, which cannot be captured as a simple string For example, let's say you want to build a custom brush to set the Background property of the Button If you are building the brush in code, it is quite straightforward: public void MakeAButton() { .. // A fancy brush for the background LinearGradientBrush fancyBruch =.

Finally, the form ID and form values are handed over to the validation function(s) specified for the form (usually the name of the form ID plus _validate).

new LinearGradientBrush(Colors.DarkGreen, Colors.LightGreen, 45); myBtn.Background = fancyBruch; myBtn.Foreground = new SolidColorBrush(Colors.Yellow); } How, however, can you represent your complex brush as a string Well, you can't! Thankfully XAML provides a special syntax that can be used whenever you need to assign a property value to a complex object, termed property-element syntax.