如何实现快捷键功能

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication1"
        mc:Ignorable="d"
        WindowStartupLocation="CenterScreen"
        KeyDown="Window_KeyDown"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <TextBlock x:Name="textBlock" HorizontalAlignment="Left" Margin="139,87,0,0" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top"/>
        <TextBox x:Name="textBox" HorizontalAlignment="Left" Height="23" Margin="194,175,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120"/>

</Grid>
</Window>

程序代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

private void Window_KeyDown(object sender, KeyEventArgs e)
        {
            textBlock.Text = e.Key.ToString();
        }
    }
}