Add a PropertyChangedValueCallback to Any Dependency Property : Event « Windows Presentation Foundation « VB.Net Tutorial






  1. VB.Net Tutorial
  2. Windows Presentation Foundation
  3. 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=" " Height="300" Width="300" Loaded="Window1_Loaded">
  <Grid>
    <Viewbox>
      <TextBox x:Name="tbxEditMe" Text="Edit Me..." />
    </Viewbox>      
  </Grid>
</Window>


//File:Window.xaml.vb
Imports System
Imports System.ComponentModel
Imports System.Windows
Imports System.Windows.Controls

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

    Private Sub Window1_Loaded(sender As Object, e As RoutedEventArgs)
      Dim descriptor As DependencyPropertyDescriptor = DependencyPropertyDescriptor.FromProperty(TextBox.TextProperty, GetType(TextBox))
      descriptor.AddValueChanged(tbxEditMe, AddressOf tbxEditMe_TextChanged)

    End Sub

    Private Sub tbxEditMe_TextChanged(sender As Object, e As EventArgs)
      MessageBox.Show("", "changed")
    End Sub
  End Class
End Namespace
WPF Add A Property Changed Value Callback To Any Dependency Property




16.87.Event
16.87.1.Get event sender from eventGet event sender from event
16.87.2.Handle the ContentRendered eventHandle the ContentRendered event
16.87.3.Find source element of an element in event handler by castingFind source element of an element in event handler by casting
16.87.4.Add an event handler to an element using codeAdd an event handler to an element using code
16.87.5.Halting event routing with HandledHalting event routing with Handled
16.87.6.Security ExceptionSecurity Exception
16.87.7.Throw Handled ExceptionThrow Handled Exception
16.87.8.Check handler event senderCheck handler event sender
16.87.9.Do event based on button nameDo event based on button name
16.87.10.Add event handler to StackPanel in StackPanel resourceAdd event handler to StackPanel in StackPanel resource
16.87.11.Add a PropertyChangedValueCallback to Any Dependency PropertyAdd a PropertyChangedValueCallback to Any Dependency Property
16.87.12.Handle a Button Click with Shared button click handlerHandle a Button Click with Shared button click handler
16.87.13.DispatcherTimer and EventHandlerDispatcherTimer and EventHandler
16.87.14.Thumb DragStarted and DragCompleted event handlerThumb DragStarted and DragCompleted event handler
16.87.15.Set interval and event handler for DispatcherTimerSet interval and event handler for DispatcherTimer
16.87.16.Get the event sender nameGet the event sender name
16.87.17.Event firing sequenceEvent firing sequence
16.87.18.Cancel event by setting CanExecute and Handled to falseCancel event by setting CanExecute and Handled to false
16.87.19.Event sender, event source and event original sourceEvent sender, event source and event original source
16.87.20.Cast event sender to a controlCast event sender to a control
16.87.21.Fire an event when an element gains and loses focus.Fire an event when an element gains and loses focus.