在C# WPF中“交换”窗口而不是打开一个新窗口？

<Window>
    <Grid>
        <ContentControl Content="{Binding CurrentWindow}" />
    </Grid>
</Window>

public class MainWindowViewModel : INotifyPropertyChanged
{
    private object _currentWindow;

    public object CurrentWindow
    {
        get { return _currentWindow; }
        set
        {
            _currentWindow = value;
            OnPropertyChanged(nameof(CurrentWindow));
        }
    }

    // 其他代码...

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

public class SubWindowViewModel
{
    // 子窗口的业务逻辑...

    public ICommand SwitchWindowCommand { get; }

    public SubWindowViewModel()
    {
        SwitchWindowCommand = new RelayCommand(SwitchWindow);
    }

    private void SwitchWindow()
    {
        // 切换到另一个窗口
        CurrentWindow = new AnotherSubWindowViewModel();
    }
}