Listen to DataContent changed event : DataContent « Windows Presentation Foundation « VB.Net

1. VB.Net
2. Windows Presentation Foundation
3. DataContent

Listen to DataContent changed event

   

<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

   
    
    
  

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1.

DataContextProperty.OverrideMetadata to update DataContext