#1,081 – Adding CommandBinding to Top-Level CommandBindings

In the example below, we bind the ApplicationCommands.Open command to some custom code by adding a CommandBinding instance to the top-level window’s CommandBindings property.

        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = this;

            this.CommandBindings.Add(new CommandBinding(ApplicationCommands.Open,
                (sender, e) => { MessageBox.Show("Executing the Open command"); },
                (sender, e) => { e.CanExecute = CanOpenIsChecked; }));
        }

We can now bind the Command property of any UI element under the top-level window to the ApplicationCommands.Open command.  Below, we bind two different buttons to the Open command.  Clicking on either button will result in execution of the same lambda expression.

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Commands" Width="320" Height="220">

    <StackPanel>
        <Button Content="Open A" Command="ApplicationCommands.Open"
                Margin="10" Padding="10,3"
                HorizontalAlignment="Center" />
        <Button Content="Open B" Command="ApplicationCommands.Open"
                Margin="10" Padding="10,3"
                HorizontalAlignment="Center" />
        <CheckBox Content="Can Open" IsChecked="{Binding CanOpenIsChecked}"
                  Margin="10"/>
    </StackPanel>
</Window>