WPF双击DataGrid事件

<Window x:Class="WpfApp8.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:WpfApp8"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <DataGrid Name="dgSimple" 
                  IsReadOnly="True"
                  MouseDoubleClick="dgSimple_MouseDobleClick"
                  CanUserAddRows="False">
        </DataGrid>
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace WpfApp8
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            List<User> users = new List<User>();
            users.Add(new User() { Id = 1, Name = "小明", Birthday = new DateTime(2019, 5, 10) });
            users.Add(new User() { Id = 2, Name = "小王", Birthday = new DateTime(2019, 4, 10) });

            dgSimple.ItemsSource = users;
        }

        private void dgSimple_MouseDobleClick(object sender, MouseButtonEventArgs e)
        {
            IInputElement element = e.MouseDevice.DirectlyOver;
            if (element != null && element is FrameworkElement)
            {
                if (((FrameworkElement)element).Parent is DataGridCell)// 是DataGridCell才响应双击
                {
                    MessageBox.Show("响应行双击");
                }
            }
        }
    }

    public class User
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public DateTime Birthday { get; set; }
    }
}