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September 22nd, 2009

Here is the sample code for last Thursday’s WPF Event Routing presentation.

Download Sample Code

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Event Types:


  • Direct events are like ordinary .NET events, canada, mexico, india. Order Keflex from mexican pharmacy, They originate in one element and don’t pass to any other. For example, where can i order Keflex without prescription, Where can i buy Keflex online, MouseEnter is a direct event.

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RoutedEventArgs Class:


  • Source indicates what object raised the event.

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  • RoutedEvent provides the RoutedEvent object for the event triggered by your event handler.

  • Handled allows you to halt the event bubbling or tunneling process, Keflex for sale. Buy Keflex no prescription,

Here is a simple example of when you might use a bubbling event:



<StackPanel Hyperlink.Click="StackPanel_Click">

    <TextBlock>

        <Hyperlink NavigateUri="http://www.yahoo.com">Yahoo!</Hyperlink>

   </TextBlock>

   <TextBlock>

       <Hyperlink NavigateUri="http://www.google.com">Google</Hyperlink>

   </TextBlock>

   <TextBlock>

       <Hyperlink NavigateUri="http://www.msn.com">MSN</Hyperlink>

   </TextBlock>

</StackPanel>




private void StackPanel_Click(object sender, RoutedEventArgs e)

{

    Process.Start(((Hyperlink)e.Source).NavigateUri.ToString());

}


So instead of having to create an event handler for each hyperlink, or creating a single event handler and pointing each hyperlink to the same event handler, I can use one event handler on the parent element.

.

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  • Steve

    I know this is a quick piece of code to show how you can do it but lots of people will just copy paste it. So a good method name (HyperlinkClicked or something), and at least check the arguments

    var hyperlink = e.Source as Hyperlink;
    if (hyperlink != null)
    Process.Start(hyperlink.NavigateUri.ToString());

  • http://brianlagunas.com Brian Lagunas

    @Steve

    I agree, you want a relevant method name, but I dissagree on checking the parameters. I know that based on my XAML element hierarchy that the only items performing the attached Hyperlink.Click event is a hyperlink object, therefore it will be impossible for the e.Source to be anything but a hyperlink or for it to be null. But if it makes you feel all warm and fuzzy by adding the extra code to explicitly check the source, then knock yourself out.

  • Steve

    @Brian Lagunas
    Actually, the Click event is the one from ButtonBase so adding a Button in your stackpanel will also invoke the method.

  • http://brianlagunas.com Brian Lagunas

    @Steve

    I understand that it is the one from ButtonBase, but based on my XAML there are no buttons in the element tree. Therefore it will be a hyperlink that performs the event. Granted, if I were to add a button to my element tree, I would need to check the source, but I am not going to add a button there, so I don’t need to check my parameters in this example.

  • Another Steve

    @Steve
    Actually a better reason for not having the parameter check is that if Brian is correct and the event should never fire for anything other than a hyperlink, you would not want to mask the issue if it firing for any other reason by just bypassing the code. A nice invalid cast exception will point immediately to an issue with your event structure that could be eating performance by routing unneeded events.