如何在TextBehind中将TextBox数据绑定到属性

<TextBox Text="{Binding TextValue}" />

public class ViewModel : INotifyPropertyChanged
{
    private string _textValue;

    public string TextValue
    {
        get { return _textValue; }
        set
        {
            if (_textValue != value)
            {
                _textValue = value;
                OnPropertyChanged(nameof(TextValue));
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

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

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
        BindingContext = new ViewModel();
    }
}