从对象构造函数更新WPF GUI

public class Person : INotifyPropertyChanged
{
    private string name;
    private int age;

    public string Name
    {
        get { return name; }
        set
        {
            name = value;
            OnPropertyChanged(nameof(Name));
        }
    }

    public int Age
    {
        get { return age; }
        set
        {
            age = value;
            OnPropertyChanged(nameof(Age));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

<Label Content="{Binding Name}" />
<Button Content="Update Age" Click="Button_Click" />

public partial class MainWindow : Window
{
    private Person person;

    public MainWindow()
    {
        InitializeComponent();

        person = new Person();
        person.Name = "John";
        person.Age = 30;

        DataContext = person;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        person.Age += 1;
    }
}