public class TimeoutDecorator : ICommand
{
    private readonly ICommand _inner;
    private readonly int _ms;
    public TimeoutDecorator(ICommand c, int ms) => (_inner, _ms) = (c, ms);
    public bool Execute()
    {
        var t = new Thread(_inner.Execute);
        t.Start();
        return t.Join(_ms);
    }
}