KeyBinding in WPF sample

------MainWindow.xaml------

<Window x:Class="CSharpWPF.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow"
        Height="350"
        Width="800"
        xmlns:l="clr-namespace:CSharpWPF">
    <Window.InputBindings>
        <KeyBinding Key="S"
                    Modifiers="Control"
                    Command="{Binding Save}" />
        <KeyBinding Key="A"
                    Modifiers="Control"
                    Command="{Binding Abort}" />
    </Window.InputBindings>
    <StackPanel>
    <TextBlock Text="{Binding Result,FallbackValue=Status}" />
        <Button Content="Save"
                Command="{Binding Save}" />
        <Button Content="Abort"
                Command="{Binding Abort}" />
    </StackPanel>
</Window>


------MainWindow.xaml.cs------

using System.Windows;

namespace CSharpWPF
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            DataContext = new ViewModel();
        }
    }
}



------ViewModel.cs------

using System;
using System.ComponentModel;
using System.Windows.Input;

namespace CSharpWPF
{
    class ViewModel : INotifyPropertyChanged
    {
        public ViewModel()
        {
            Save = new SimpleCommand(() => Result = "Save Executed");
            Abort = new SimpleCommand(() => Result = "Abort Executed");
        }
        public ICommand Save { get; private set; }
        public ICommand Abort { get; private set; }

        string _result;
        public string Result
        {
            get
            {
                return _result;
            }
            private set
            {
                _result = value;
                RaisePropertyChanged("Result");
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected void RaisePropertyChanged(string property)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
                handler(this, new PropertyChangedEventArgs(property));
        }
    }

    class SimpleCommand : ICommand
    {
        Action action;

        public SimpleCommand(Action action)
        {
            this.action = action;
        }
        public bool CanExecute(object parameter)
        {
            return true;
        }

        public event EventHandler CanExecuteChanged;

        public void Execute(object parameter)
        {
            action();
        }
    }
}