Keyboard events in a WPF MVVM application?

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To bring an updated answer, the .net 4.0 framework enables you to do this nicely by letting you bind a KeyBinding Command to a command in a viewmodel.

So… If you wanted to listen for the Enter key, you’d do something like this:

<TextBox AcceptsReturn="False">
    <TextBox.InputBindings>
        <KeyBinding 
            Key="Enter" 
            Command="{Binding SearchCommand}" 
            CommandParameter="{Binding Path=Text, RelativeSource={RelativeSource AncestorType={x:Type TextBox}}}" />
    </TextBox.InputBindings>
</TextBox>

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