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Button Control - read the Tag property

Posted on 2014-03-11
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Last Modified: 2014-03-11
I came across some code in a book I'm reading and decided to give it a try.  I'm trying to read the tag property of a button when its clicked.

<Window x:Class="HandlManyButtonsOneEventEx.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <StackPanel Button.Click="DoSomething">
        <Button Name="cmd1" Tag="Button 1">Command 1</Button>
        <Button Name="cmd2" Tag="Button 2">Command 2</Button>
        <Button Name="cmd3" Tag="Button 3">Command 3</Button>        
    </StackPanel>
</Window>

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public void DoSomething(object sender, RoutedEventArgs e) 
        {  
            object tag = ((FrameworkElement)sender).Tag;
            MessageBox.Show((string)tag);
        }

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Every time i click the button, the tag returns a null value.  Is this code correct?  What am I doing wrong?
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Question by:mmsi
1 Comment
 
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Snarf0001 earned 400 total points
ID: 39920427
It's almost right.  Even though the event is targeting the buttons, since it's declared on the StackPanel, THAT's what's being passed in as the sender.
Use the .Source property of the routedeventargs instead.

public void DoSomething(object sender, RoutedEventArgs e)
{
    object tag = ((FrameworkElement)e.Source).Tag;
    MessageBox.Show((string)tag);
} 

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