CSharp - Format NumberStyles Type

Introduction

Each numeric type defines a static Parse method that accepts a NumberStyles argument.

NumberStyles is a flags enum to control how to convert string to a numeric type.

It has the following combinable members:

• AllowCurrencySymbol
• AllowDecimalPoint
• AllowExponent
• AllowHexSpecifier
• AllowLeadingSign
• AllowLeadingWhite
• AllowParentheses
• AllowThousands
• AllowTrailingSign
• AllowTrailingWhite

NumberStyles defines these composite members:

• None
• Integer
• Float
• Number
• HexNumber
• Currency
• Any

Except for None, all composite values include AllowLeadingWhite and AllowTrailingWhite.

Demo

using System;
using System.Globalization;

class MainClass//ww  w.  j av a2s  .  co m
{
    public static void Main(string[] args)
    {

        int thousand = int.Parse("3E8", NumberStyles.HexNumber);
        int minusTwo = int.Parse("(2)", NumberStyles.Integer |
                                         NumberStyles.AllowParentheses);
        double aMillion = double.Parse("1,000,000", NumberStyles.Any);
        Console.WriteLine(aMillion);

        decimal threeMillion = decimal.Parse("3e6", NumberStyles.Any);
        Console.WriteLine(threeMillion);

        decimal fivePointTwo = decimal.Parse("$5.20", NumberStyles.Currency);
        Console.WriteLine(fivePointTwo);

    }
}

Result

The following code hardcoded to work with the euro sign and a blank group separator for currencies:

NumberFormatInfo ni = new NumberFormatInfo();
ni.CurrencySymbol = "C";
ni.CurrencyGroupSeparator = " ";
double million = double.Parse ("C1 000 000", NumberStyles.Currency, ni);

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