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Editorial Team
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Asked: 2026-05-12T14:59:57+00:00

I’m trying to fire commands based on keystrokes in Silverlight. As I understand you

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I’m trying to fire commands based on keystrokes in Silverlight. As I understand you cannot use AccessKey or AcceleratorKey in Silverlight. Also it looks like the might be helpful attached property InputBindings does not work either.

I started looking in other places. It looked like Prism was the way to get commands working in Silverlight, so I checked that out. However they only have a Click handler, which isn’t even a useful starting point for getting key commands set up.

Am I just missing some part of Prism? Or is there a good standard way of handling hotkeys with MVVM Silverlight?

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1 Answer

  1. Editorial Team

    It sounds like you’re looking for a “codeless” MVVMish way of handling the KeyUp/KeyPress/KeyDown event.

    Option #1: Prism.
    You’ve mentioned it only ships with the Click command. However, you can add your own attached DPs to enable commands for whatever event you’d like (like KeyUp/KeyDown/KeyPress).

    If you’re looking for a sample on that Corey has a good one for ToggleButton.Checked/Unchecked events.
    http://www.85turns.com/2009/06/24/togglebutton-command-for-prism/ 

    <ToggleButton x:Name="ToggleButton1" 
            customCommands:Checked.Command="{Binding CheckedCommand}"
            customCommands:UnChecked.Command="{Binding UnCheckedCommand}"
        Margin="8,8,0,8" Content="Check me"
        />

    Also, Erik Mork has an excellent video that gives you a good overview on commands and how to create a custom command Attached DP.
    http://development-guides.silverbaylabs.org/Video/Prism-Commands

    Option #2: Blend Triggers
    The Expression Blend SDK ships with Triggers and Behaviours that are spot on to what you’re try to do.
    Blend Examples codeplex project ships with a EventTrigger you could use: 

    <i:EventTrigger EventName="Click">
      <si:InvokeDataCommand Command="{Binding ShoppingCart.CheckOutCommand}"/>
</i:EventTrigger>

    Or, you could create your own custom Trigger for Key stroke events and do there whatever you’d like. Here’s a sample:
    http://azurecoding.net/blogs/brownie/archive/2009/04/06/blend-behaviors-ftw.aspx

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