如何检测TextBlock的Text属性的更改？

public class ObservableObject : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

public class CustomTextBlock : ObservableObject
{
    private string _text;
    public string Text
    {
        get { return _text; }
        set
        {
            _text = value;
            OnPropertyChanged();
        }
    }
}

var textBlock = new CustomTextBlock();
textBlock.PropertyChanged += TextBlock_PropertyChanged;

private void TextBlock_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
    if (e.PropertyName == nameof(CustomTextBlock.Text))
    {
        // 在此处处理Text属性更改的情况。
    }
}