private void OnResultClick(object sender, EventArgs e)
{
_isDigitPressed = false;
_isOperatorPressed = false;
_equation = "";
try
{
Func <decimal, string> converter = Convert.ToString;
_textToBeShown = converter(_calculatorEngine.SubmitOperation(_operation, Convert.ToDecimal(_shownText)));
}
catch (Exception ex)
{
if (ex is FormatException || ex is ArgumentException)
{
_messageBoxDisplayService.Show(ex.Message);
_textToBeShown = "Invalid operation";
}
}
if (Regex.Matches(_textToBeShown, @"[a-zA-Z]").Count > 0)//
{
_messageBoxDisplayService.Show("Invalid operation");
}
else
{
try
{
_textToBeShown = GetFormattedNumberForDisplay(_textToBeShown);
}
catch (FormatException formatEx)
{
_messageBoxDisplayService.Show(formatEx.Message);
_textToBeShown = "Invalid operation";
}
}
_isResultObtained = true;
_calculatorView.SetResultBoxText(_textToBeShown);
_history += (_textToBeShown + ", ");
_calculatorView.SetHistoryBoxText(_history);
if (_isDigitPressed)
{
_calculatorEngine.ClearValue();
}
}