如何从不同的ViewModel更新文本块和进度条？

// ViewModel
public class MainViewModel : INotifyPropertyChanged
{
    private string _text;
    private int _progress;

    public string Text
    {
        get { return _text; }
        set
        {
            _text = value;
            OnPropertyChanged(nameof(Text));
        }
    }

    public int Progress
    {
        get { return _progress; }
        set
        {
            _progress = value;
            OnPropertyChanged(nameof(Progress));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

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

// View
<Window>
    <Grid>
        <TextBlock Text="{Binding Text}" />
        <ProgressBar Value="{Binding Progress}" />
    </Grid>
</Window>

// 更新文本块和进度条
MainViewModel viewModel = new MainViewModel();
viewModel.Text = "Hello, World!";
viewModel.Progress = 50;