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How can I handle the Keyboard.KeyDown event without using code-behind? We are trying to use the MVVM pattern and avoid writing an event handler in code-behind file.
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keypress – fires when you press a character keyboard like a , b , or c , not the left arrow key, home, or end keyboard, … The keypress also fires repeatedly while you hold down the key on the keyboard.
The single most important aspect of WPF that makes MVVM a great pattern to use is the data binding infrastructure. By binding properties of a view to a ViewModel, you get loose coupling between the two and entirely remove the need for writing code in a ViewModel that directly updates a view.
WPF assumes MVVM for most things. e.g. using a the wpf tree control without MVVM will have you tearing your hair out within a day.. MVVM just makes things simpler and testable. This could answer some of the questions: wintellect.com/CS/blogs/jlikness/archive/2010/04/14/….
Commands are an implementation of the ICommand interface that is part of the . NET Framework. This interface is used a lot in MVVM applications, but it is useful not only in XAML-based apps.
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> If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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