Find source element of an element in event handler by casting

    


<StackPanel
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="WpfApplication1.RoutedEventSource">
  <StackPanel.Resources>
    <Style TargetType ="{x:Type Button}">
      <Setter Property="Height" Value="30"/>
      <Setter Property="Width" Value="100"/>
      <Setter Property="HorizontalAlignment" Value="Left"/>
    </Style>
  </StackPanel.Resources>
  <Button Click="HandleClick">Button 1</Button>
  <Button Click="HandleClick">Button 2</Button>
  <Button Click="HandleClick">Button 3</Button>    
</StackPanel>

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

Namespace WpfApplication1
  Public Partial Class RoutedEventSource
    Private Sub HandleClick(sender As Object, e As RoutedEventArgs)
      Dim srcButton As Button = TryCast(e.Source, Button)
      srcButton.Width = 200
    End Sub
  End Class
End Namespace

1.	Get event sender from event
2.	Handle the ContentRendered event
3.	Add an event handler to an element using code
4.	Halting event routing with Handled
5.	Security Exception
6.	Throw Handled Exception
7.	Check handler event sender
8.	Do event based on button name
9.	Add event handler to StackPanel in StackPanel resource
10.	Add a PropertyChangedValueCallback to Any Dependency Property
11.	Handle a Button Click with Shared button click handler
12.	DispatcherTimer and EventHandler
13.	Thumb DragStarted and DragCompleted event handler
14.	Set interval and event handler for DispatcherTimer
15.	Get the event sender name
16.	Event firing sequence
17.	Cancel event by setting CanExecute and Handled to false
18.	Event sender, event source and event original source
19.	Cast event sender to a control
20.	Fire an event when an element gains and loses focus.

Find source element of an element in event handler by casting : Event « Windows Presentation Foundation « VB.Net

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