C# EPPlus get value of formula cell

Question

I have a simple formula in a number of cells and I'm trying to get the result of that formula into a variable in my program. My inital code was:
var ECC = ws.Cells["B14"].Value; decimal ECP = Convert.ToDecimal(ECC);
but this got me an error "System.InvalidCastException: 'Unable to cast object of type 'OfficeOpenXml.ExcelErrorValue' to type 'System.IConvertible'.'" I tried calculating and adding a toString, making my code:
ws.Cells["B14"].Calculate(); decimal ECP = Convert.ToDecimal(ws.Cells["B14"].Value.ToString());
This got me a different error: "System.FormatException: 'Input string was not in a correct format.'" on the second line.

The result of the formula will always be a decimal and it's important that I get it into a decimal variable because I'm putting that value into a SQL database. How can I do this error-free?

Answer 1

This works in one my apps:

var pressure = informationWorkSheet.Cells[30, 3];

Cast it to a Decimal:

Decimal pressureDecimal = (Decimal) pressure;

Or parse it:

Decimal.Parse(pressure.ToString());

Answer 2

Try this approach with decimal.TryParse . Works as expected in my sample application. Tested with values: 3,2 / 3.2 / 5

string ECC = ws.Cells["B14"].Value.ToString();
bool isDecimal = decimal.TryParse(ECC, out decimal result);
if (isDecimal)
{
    decimal ECP = result;
}