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A New WinRT Behavior to Mimic EventToCommand

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Some time ago I posted a WinRT behavior to mimic EventToCommand. This behavior cunningly looked for the command name in the DataContext, but it occurred to me (and some blog post commenters as well) that it actually might be more logical skip all that skullduggery and let the developer bind to a command in stead of letting her/him provide its name as string and then go look for it.

Anyway, not wanting to break compatibility I added a new behavior to my win8nl library on CodePlex, very originally called EventToBoundCommandBehavior.

It’s working is very similar to the original EventToCommandBehavior. There are two notable differences:

  • The Command property is now no longer of type string but ICommand
  • The FireCommand method is now very simple:

private void FireCommand()
{
  if (Command != null && Command.CanExecute(CommandParameter))
  {
    Command.Execute(CommandParameter);
  }
}

Just go to Bound in the third line and {Binding TestCommand} in the fourth.

<TextBlock Text="TextBlock" FontSize="48">
  <WinRtBehaviors:Interaction.Behaviors>
    <Behaviors:EventToBoundCommandBehavior Event="Tapped" 
      Command="{Binding TestCommand}" 
      CommandParameter="{Binding TestProperty, Mode=TwoWay}"/>
  </WinRtBehaviors:Interaction.Behaviors>
</TextBlock>

And that’s all there is to it.

Those who want to see the full source code of the new (and largely simplified) behavior can do so at http://win8nl.codeplex.com/SourceControl/changeset/view/20896#395786


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Published at DZone with permission of Joost van Schaik, DZone MVB. See the original article here.

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