ExcelDna.Registration.TypeConversion.ConvertToBoolean C# (CSharp) Метод

        public static bool ConvertToBoolean(object value)
        {
            object result;
            var retVal = XlCall.TryExcel(XlCall.xlCoerce, out result, value, (int)XlType.XlTypeBoolean);
            if (retVal == XlCall.XlReturn.XlReturnSuccess)
                return (bool)result;

            // failed - as a fallback, try to convert to a double
            retVal = XlCall.TryExcel(XlCall.xlCoerce, out result, value, (int)XlType.XlTypeNumber);
            if (retVal == XlCall.XlReturn.XlReturnSuccess)
                return ((double)result != 0.0);

            // We give up.
            throw new InvalidCastException("Value " + value.ToString() + " could not be converted to Boolean.");
        }