NP140 NumberFormatInfo and Double.Parse()

Question

Hi Guys

In the following program what is the function of NumberFormatInfo and Double.Parse() method. Because I am unable to explain the output of program.

Please explain.

Thank you

using System;

using System.Globalization;

//using System.Text;

public class NumParsingApp

{

public static void Main(string[] args)

{

string u = "AA -1,234,567.890 ";

NumberFormatInfo ni = new NumberFormatInfo();

ni.CurrencySymbol = "AA";

double h = Double.Parse(u, NumberStyles.Any, ni);

Console.WriteLine("h = {0:F}", h);

}

/*

h = -1234567.89

*/

Maha · Answer

Thank you

Alan · Answer

The NumberFormatInfo class is used to define how numbers are formatted in a particular culture. In this case it's used to tell double.Parse() that the number can be (though it doesn't have to be) preceded by a currency symbol AA. Armed with that info double.Parse() is then able to parse the string AA -1234567.890 to the double value -1234567.89. If NumerFormatInfo hadn't been used a format exception would have been thrown.