WPF KeyDown MVVM Via Behavior

 <behavior:Interaction.Triggers>
     <behavior:EventTrigger EventName="KeyDown">
         <behavior:CallMethodAction MethodName="Window_KeyDown" TargetObject="{Binding}"/>
     </behavior:EventTrigger>
 </behavior:Interaction.Triggers>

 

 

 

//xaml
<Window x:Class="WpfApp248.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:behavior="http://schemas.microsoft.com/xaml/behaviors"
        xmlns:local="clr-namespace:WpfApp248"
        Title="MainWindow" Height="450" Width="800">
    <behavior:Interaction.Triggers>
        <behavior:EventTrigger EventName="KeyDown">
            <behavior:CallMethodAction MethodName="Window_KeyDown" TargetObject="{Binding}"/>
        </behavior:EventTrigger>
    </behavior:Interaction.Triggers>    
    <Grid>
        
    </Grid>
</Window>


//xaml.cs
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 WpfApp248
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            var vm=new MainVM();
            this.DataContext = vm;
        }  
    }

    public class MainVM
    {
        public MainVM()
        { 
        }
         
        public void Window_KeyDown(object sender, KeyEventArgs e)
        {
            System.Diagnostics.Debug.WriteLine(e.Key.ToString());
        }
    }
}