如何在WPF DataGrid中双击获取列值？

<Window x:Class="WpfDataGridExample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <DataGrid x:Name="dataGrid" MouseDoubleClick="DataGrid_MouseDoubleClick">
            <DataGrid.Columns>
                <DataGridTextColumn Header="ID" Binding="{Binding ID}"/>
                <DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
                <DataGridTextColumn Header="Age" Binding="{Binding Age}"/>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>

using System.Windows;
using System.Windows.Controls;

namespace WpfDataGridExample
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            // 假设有一些数据绑定到DataGrid
            dataGrid.ItemsSource = new List<Person>
            {
                new Person { ID = 1, Name = "Alice", Age = 30 },
                new Person { ID = 2, Name = "Bob", Age = 25 },
                new Person { ID = 3, Name = "Charlie", Age = 35 }
            };
        }

        private void DataGrid_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            DataGrid dataGrid = sender as DataGrid;
            if (dataGrid != null && dataGrid.SelectedItem != null)
            {
                var selectedRow = dataGrid.SelectedItem as Person;
                if (selectedRow != null)
                {
                    MessageBox.Show($"ID: {selectedRow.ID}, Name: {selectedRow.Name}, Age: {selectedRow.Age}");
                }
            }
        }
    }

    public class Person
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public int Age { get; set; }
    }
}