/// <summary>式を検証し、結果を返す。</summary>
/// <param name="formula"></param>
/// <param name="formula_LastValid"></param>
/// <param name="result"></param>
/// <param name="isValid"></param>
protected void ValidateFormula(string formula, string formula_LastValid, out double result, out bool isValid)
{
FormulaEngine engine = Application.FormulaEngine;
isValid = true;
try
{
result = engine.Calculate(formula);
}
catch (FormulaResultException)
{
isValid = false;
result = engine.Calculate(formula_LastValid);
}
}