如何刷新TextBox - mvvm上成员属性值

// ViewModel
public class MyViewModel : INotifyPropertyChanged
{
    private string _myProperty;
    
    public string MyProperty
    {
        get { return _myProperty; }
        set
        {
            if (_myProperty != value)
            {
                _myProperty = value;
                OnPropertyChanged(nameof(MyProperty));
            }
        }
    }
    
    public event PropertyChangedEventHandler PropertyChanged;
    
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

// View
<TextBox Text="{Binding MyProperty, Mode=TwoWay}" />

// 在代码中创建ViewModel实例，并将其设置为视图的DataContext
MyViewModel viewModel = new MyViewModel();
DataContext = viewModel;

// 更新属性值
viewModel.MyProperty = "新的值";