如何使用UserControl DP和MVVM

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

public class UserViewModel : INotifyPropertyChanged
{
    private User _user;
    public User User
    {
        get => _user;
        set
        {
            _user = value;
            OnPropertyChanged(nameof(User));
        }
    }

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

<UserControl x:Class="YourNamespace.UserInfoControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="400">
    <Grid>
        <StackPanel>
            <TextBlock Text="Name:" />
            <TextBox Text="{Binding User.Name, UpdateSourceTrigger=PropertyChanged}" />
            <TextBlock Text="Age:" />
            <TextBox Text="{Binding User.Age, UpdateSourceTrigger=PropertyChanged}" />
        </StackPanel>
    </Grid>
</UserControl>

public partial class UserInfoControl : UserControl
{
    public static readonly DependencyProperty UserProperty =
        DependencyProperty.Register("User", typeof(User), typeof(UserInfoControl), new PropertyMetadata(null));

    public User User
    {
        get => (User)GetValue(UserProperty);
        set => SetValue(UserProperty, value);
    }

    public UserInfoControl()
    {
        InitializeComponent();
        this.DataContext = new UserViewModel { User = new User() };
    }
}

<Window x:Class="YourNamespace.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:YourNamespace"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <local:UserInfoControl User="{Binding SelectedUser}" />
    </Grid>
</Window>

public class MainViewModel : INotifyPropertyChanged
{
    private User _selectedUser;
    public User SelectedUser
    {
        get => _selectedUser;
        set
        {
            _selectedUser = value;
            OnPropertyChanged(nameof(SelectedUser));
        }
    }

    // Other properties and methods...
}