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.cs


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

namespace RoutedEvents
{
    public partial class BubbledLabelClick : System.Windows.Window
    {

        public BubbledLabelClick()
        {
            InitializeComponent();
        }

        protected int eventCounter = 0;

        private void SomethingClicked(object sender, RoutedEventArgs e)
        {            
            eventCounter++;
            string message = "#" + eventCounter.ToString() + ":\r\n" + 
                " Sender: " + sender.ToString() + "\r\n" +
                " Source: " + e.Source + "\r\n" +
                " Original Source: " + e.OriginalSource;
            lstMessages.Items.Add(message);
            e.Handled = (bool)chkHandle.IsChecked;            
        }

        private void cmdClear_Click(object sender, RoutedEventArgs e)
        {            
            eventCounter = 0;
            lstMessages.Items.Clear();
        }
    }
}

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Event sender, event source and event original source : Event « Windows Presentation Foundation « C# / C Sharp

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