使用ViewModel类中的MVVM关闭窗口

public class RelayCommand : ICommand
{
    private Action<object> execute;

    public RelayCommand(Action<object> execute)
    {
        this.execute = execute;
    }

    public bool CanExecute(object parameter)
    {
        return true;
    }

    public void Execute(object parameter)
    {
        this.execute(parameter);
    }

    public event EventHandler CanExecuteChanged;
}

public class MyViewModel
{
    public ICommand CloseWindowCommand { get; private set; }

    public MyViewModel()
    {
        this.CloseWindowCommand = new RelayCommand(CloseWindow);
    }

    private void CloseWindow(object window)
    {
        if (window != null && window is Window)
        {
            ((Window)window).Close();
        }
    }
}

<Button Content="Close" Command="{Binding CloseWindowCommand}" CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}"/>