Programmatically Extract an Element's Style with DefaultStyleKeyProperty : UI Element « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. UI Element

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="120" Width="220">
    <Window.Resources>
        <Style x:Key="CustomProgressBarStyle" TargetType="{x:Type ProgressBar}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ProgressBar}">
                        <Grid>
                            <Border Name="PART_Track" Background="{DynamicResource {x:Static SystemColors.InactiveCaptionBrushKey}}"                          
                            BorderBrush="{DynamicResource {x:Static SystemColors.InactiveBorderBrushKey}}"                          
                            BorderThickness="1" />
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

    </Window.Resources>

    <StackPanel>
        <ProgressBar x:Name="MyProgressBar" Value="30" Width="200" HorizontalAlignment="Center" Style="{DynamicResource CustomProgressBarStyle}"/>
        <Button Click="Button_Click" Content="Extract Style"/>
    </StackPanel>

</Window>

//File:Window.xaml.vb

Imports System
Imports System.Reflection
Imports System.Windows
Imports System.Windows.Markup

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Sub New()
      InitializeComponent()
    End Sub

    Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
      Dim type As Type = GetType(FrameworkElement)
      Dim fieldInfo As FieldInfo = type.GetField("DefaultStyleKeyProperty", BindingFlags.[Static] Or BindingFlags.NonPublic)

      Dim defaultStyleKeyProperty As DependencyProperty = DirectCast(fieldInfo.GetValue(MyProgressBar), DependencyProperty)

      Dim defaultStyleKey As Object = MyProgressBar.GetValue(defaultStyleKeyProperty)
      Dim style As Style = DirectCast(Application.Current.FindResource(defaultStyleKey), Style)
      Dim styleXaml As String = XamlWriter.Save(style)
      Console.WriteLine(styleXaml)
    End Sub
  End Class
End Namespace

16.50.UI Element
	16.50.1.	Find enclosure component
	16.50.2.	Clear locally set values and restore the default values of dependency properties
	16.50.3.	PresentationTraceSources.SetTraceLevel(binding,PresentationTraceLevel.High);
	16.50.4.	UI Element Mouse Clicked Events
	16.50.5.	Programmatically Extract an Element's Style with DefaultStyleKeyProperty
	16.50.6.	Print Logical Tree
	16.50.7.	Print Visual Tree
	16.50.8.	About Dialog with Tree Walking
	16.50.9.	Changing graphical elements
	16.50.10.	UIElement Count
	16.50.11.	Use Linq to get control from a container
	16.50.12.	Find inner visual element
	16.50.13.	Logical Visual Tree Sample
	16.50.14.	Point Hit Test with VisualTreeHelper.HitTest
	16.50.15.	Change the Visibility property of a UIElement.
	16.50.16.	Mixing graphics with Control Elements