mscorlib.dll中发生了'System.FormatException'类型的未处理的异常其他信息：输入字符串的格式不正确

Question

        //Declaring of "Total Statements"
        double   NetSalary, PensionFundPercentage, grossSalary, TaxableAmount, MonthlySalary, Allowance, Paye, Uif, MedicalAid, totalDeduction;
        double PensionFund;


        double Other = 0;
        double.TryParse(txtOtherDeductions.Text, out Other);

        //Convert Statements
        Allowance = Convert.ToDouble(txtDeductions.Text);
        PensionFund = Convert.ToDouble(txtPenFund.Text);
        Paye = Convert.ToDouble(txtPayasUEarn.Text);

IM UNABLE TO CALCULTE THE SALARY AMOUNT TO AGAINST THE THE AMOUNT QUOTED

Answer 1

Try localize the where it fails.

Taken from msdn.

Remarks

Using the ToDouble(String) method is equivalent to passing value to the Double.Parse(String) method. value is interpreted by using the formatting conventions of the current thread culture.

If you prefer not to handle an exception if the conversion fails, you can call the Double.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.

Read more here: https://msdn.microsoft.com/en-us/library/zh1hkw6k(v=vs.110).aspx

Answer 2

Perhaps, try using NumberFormatInfo while calling Convert.ToDouble(...). I assume NumberFormat (or lack of) it could be a reason. For example,

txtPenFund.Text = "2.00,00"; // assuming a convenient example to get exception
double PensionFund;
PensionFund = Convert.ToDouble(txtPenFund.Text); // will throw format exception

If I use NumberFormatInfo, I can convert the string to double as expected.

NumberFormatInfo numFormat = new NumberFormatInfo();
numFormat.NumberDecimalSeparator = ",";
numFormat.NumberGroupSeparator = ".";
// somewhere in the UI, txtPenFund is set
txtPenFund.Text = "2.00,00";

double PensionFund;
PensionFund = Convert.ToDouble(txtPenFund.Text, numFormat);