public string Undo()
        {
            switch (_prevSpeed)
            {
            case Fan.High:
                return(_fan.SetHigh());

            case Fan.Medium:
                return(_fan.SetMedium());

            case Fan.Low:
                return(_fan.SetLow());

            case Fan.Off:
                return(_fan.SetOff());

            default:
                return("fan set speed error");
            }
        }
Exemple #2
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        public string Undo()
        {
            if (_prevSpeed.Equals(Fan.High))
            {
                _fan.SetHigh();
            }

            if (_prevSpeed.Equals(Fan.Medium))
            {
                _fan.SetMedium();
            }

            if (_prevSpeed.Equals(Fan.Low))
            {
                _fan.SetLow();
            }

            if (_prevSpeed.Equals(Fan.Off))
            {
                _fan.SetOff();
            }

            return("fan set speed error");
        }