如何使用数据绑定更改XAML文件的样式？

<DataTemplate x:Key="MyDataTemplate">
   <StackPanel>
        <TextBlock Text="{Binding Name}" />
        <TextBlock Text="{Binding Age}" />
    </StackPanel>
</DataTemplate>

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

public MainWindow()
{
    InitializeComponent();

    List<Person> people = new List<Person>
    {
        new Person { Name = "John", Age = 30 },
        new Person { Name = "Jane", Age = 25 }
    };

    DataContext = people;
}