How Does InitializeComponent() Bridge XAML and the WPF Object Model?

WPF's InitializeComponent(): Bridging XAML and the Object Model

In WPF applications, InitializeComponent() is vital, particularly for Window and UserControl elements. Its key role is to link the XAML description of a control to its corresponding object model representation.

The execution of InitializeComponent() involves these steps:

1. Access to the control's partial class definition.
2. Identification of the XAML file's URI.
3. Calling LoadComponent() (within System.Windows.Application) with the XAML URI.

LoadComponent() then undertakes:

1. Loading the XAML file and constructing a tree of XAML elements.
2. XamlParser processes each element, creating corresponding object model instances.
3. BamlRecordWriter converts XAML into its binary form (BAML).
4. Finally, these BAML elements are transformed into the control's object structure.

Handling Attached Properties

Attached properties, uniquely defined outside a class (using a colon), are handled by InitializeComponent() as follows:

1. Correct application to the control's object model elements.
2. If a XAML value is provided, it's set during object creation.
3. Otherwise, the attached property inherits its default value.

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