Event sender, event source and event original source

     

<Window x:Class="RoutedEvents.BubbledLabelClick"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="BubbledLabelClick" Height="360" Width="330" MouseUp="SomethingClicked" >
    <StackPanel MouseUp="SomethingClicked">
      <Label Margin="5" BorderThickness="1" MouseUp="SomethingClicked" HorizontalAlignment="Left" >
        <StackPanel MouseUp="SomethingClicked" >
          <TextBlock Margin="3" MouseUp="SomethingClicked">label</TextBlock>
          <Image Source="c:\image.jpg" Stretch="None" MouseUp="SomethingClicked" />
          <TextBlock Margin="3" MouseUp="SomethingClicked">test</TextBlock>
        </StackPanel>
      </Label>
      <ListBox Margin="5" Name="lstMessages" Grid.Row="1"></ListBox>
      <CheckBox Margin="5" Name="chkHandle">Handle first event</CheckBox>
      <Button Click="cmdClear_Click" HorizontalAlignment="Right" Margin="5" Padding="3">Clear List</Button>
    </StackPanel>
</Window>
//File:Window.xaml.vb


Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes

Namespace RoutedEvents
  Public Partial Class BubbledLabelClick
    Inherits System.Windows.Window

    Public Sub New()
      InitializeComponent()
    End Sub

    Protected eventCounter As Integer = 0

    Private Sub SomethingClicked(sender As Object, e As RoutedEventArgs)
      eventCounter += 1
      Dim message As String = "#" & eventCounter.ToString() & ":" & vbCr & vbLf & " Sender: " & sender.ToString() & vbCr & vbLf & " Source: " & Convert.ToString(e.Source) & vbCr & vbLf & " Original Source: " & Convert.ToString(e.OriginalSource)
      lstMessages.Items.Add(message)
      e.Handled = CBool(chkHandle.IsChecked)
    End Sub

    Private Sub cmdClear_Click(sender As Object, e As RoutedEventArgs)
      eventCounter = 0
      lstMessages.Items.Clear()
    End Sub
  End Class
End Namespace

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

Event sender, event source and event original source : Event « Windows Presentation Foundation « VB.Net

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