将String解析为double时发生System.FormatException

Question

the Code worked fine in Unity. Now I'm using the samecode in a console Project and im getting a System.FormatException exception.

The code is:

private double ConvertToNumber(string number)
        {      
            return double.Parse(number, numberStyle);
        }

parameter when calling are:

number = "3.138924e-002"
numberStyle = NumberStyles.AllowExponent | NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign

Does anyone see the Error, or knows what might caus this?

Answer 1

The exception is thrown because the string you are providing cannot be converted to a number using the format you specified and your own current cultrue . The latter is implict unless you specify it.

If you are reading this value from a database, you should use the invariant culture (ie a culture designed to persist numbers and dates in a consistent way in whatever place you need, except user interfaces).

Your code becomes:

return double.Parse(number, numberStyle, System.Globalization.CultureInfo.InvariantCulture);

Instead, if you need a specific culture, you need to pass the correct culture in place of the invariant one.

Answer 2

@ Selvin关于CultureInfo.InvariantCulture是正确的，将其添加为参数可以修复错误。

return double.Parse(number, numberStyle, CultureInfo.InvariantCulture);