Wrox.ProCSharp.Composition.CalculatorViewModel.SetCurrentOperation C# (CSharp) 메소드

        private void SetCurrentOperation(IOperation op)
        {
            try
            {
                _currentOperands = new double[op.NumberOperands];
                _currentOperands[0] = double.Parse(Input);
                Input += $" {op.Name} ";

                SetProperty(ref _currentOperation, op, nameof(CurrentOperation));
            }
            catch (FormatException ex)
            {
                Status = ex.Message;
            }
        }
        public ObservableCollection<IOperation> CalcAddInOperators { get; } = new ObservableCollection<IOperation>();