<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="100" Width="200">
<StackPanel>
<TextBox x:Name="tbxUserText" Text="Enter some text..."/>
<Button Click="Button_Click" Content="Update DataContext"/>
</StackPanel>
</Window>
//File:Window.xaml.vb
Imports System.Windows
Imports System
Namespace WpfApplication1
Public Partial Class Window1
Inherits Window
Public Sub New()
InitializeComponent()
DataContextProperty.OverrideMetadata(GetType(Window1), New FrameworkPropertyMetadata(100.0, New PropertyChangedCallback(AddressOf DataContext_PropertyChanged)))
End Sub
Private Shared Sub DataContext_PropertyChanged(d As DependencyObject, e As DependencyPropertyChangedEventArgs)
Dim msg As String = String.Format("DataContext changed.{0}{0}Old Value: {1}{0}New Value: {2}", Environment.NewLine, e.OldValue.ToString(), e.NewValue.ToString())
MessageBox.Show(msg, "changed")
End Sub
Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
DataContext = tbxUserText.Text
End Sub
End Class
End Namespace
