Property changed callback : Command « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. Command

<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="300" Width="300">

    <StackPanel>
      <TextBox x:Name="uv" Text="{Binding Path=UserValue, UpdateSourceTrigger=PropertyChanged}" 
               />

    </StackPanel>

</Window>


//File:Window1.xaml.cs
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Sub New()
      InitializeComponent()
      DataContext = Me
    End Sub
    Private Shared Sub UserValue_PropertyChangedCallback(d As DependencyObject, e As DependencyPropertyChangedEventArgs)
      Dim window1 As Window1 = TryCast(d, Window1)

      If window1 IsNot Nothing Then
        window1.uv.Foreground = Brushes.SeaGreen
      End If
    End Sub
  End Class
End Namespace

16.89.Command
	16.89.1.	Invoking Copy command with a Button
	16.89.2.	Button CommandTarget Binding
	16.89.3.	Creating CommandBinding and attaching an Executed and CanExecute handler
	16.89.4.	Command Handler Command Binding in Xaml
	16.89.5.	Property changed callback
	16.89.6.	Using CommandBinding and ExecutedRoutedEventHandler to bind Application event to an event handler method
	16.89.7.	Create CommandBindings in Xaml and bind to Button
	16.89.8.	Bind TextBox save command to CommandBinding
	16.89.9.	Press F1 to get help
	16.89.10.	Help command
	16.89.11.	Command Enabling