What is ToString N0 format

Question

This code is from Charles Pettzold s  Programming Windows Sixth Edition  book   public object Convert object value  Type targetType  object parameter  string language          return   double value  ToString  N0         ToString  N0   is supposed to print the value with comma separators and no decimal points  I cannot find the reference to appropriate ToString overload and  N0  format in the documentation  Please point me to the right place in  NET documentation

User · Answer

It is a sort of format specifier for formatting numeric results. There are additional specifiers on the link.

What N does is that it separates numbers into thousand decimal places according to your CultureInfo and represents only 2 decimal digits in floating part as is N2 by rounding right-most digit if necessary.

N0 does not represent any decimal place but rounding is applied to it.

Let's exemplify.

using System;
using System.Globalization;


namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            double x = 567892.98789;
            CultureInfo someCulture = new CultureInfo("da-DK", false);

            // 10 means left-padded = right-alignment
            Console.WriteLine(String.Format(someCulture, "{0:N} denmark", x));
            Console.WriteLine("{0,10:N} us", x); 

            // watch out rounding 567,893
            Console.WriteLine(String.Format(someCulture, "{0,10:N0}", x)); 
            Console.WriteLine("{0,10:N0}", x);

            Console.WriteLine(String.Format(someCulture, "{0,10:N5}", x));
            Console.WriteLine("{0,10:N5}", x);


            Console.ReadKey();

        }
    }
}

It yields,

567.892,99 denmark
567,892.99 us
   567.893
   567,893
567.892,98789
567,892.98789

User · Answer

Here is a good start maybe  Double ToString    Have a look in the examples for a number of different formating options Double ToString string

User · Answer

This is where the documentation is   http   msdn microsoft com en-us library dwhawy9k aspx     The numeric   N   format specifier converts a number to a string of   the form  -d ddd ddd ddd      where  -  indicates a negative number   symbol if required   d  indicates a digit  0-9        And this is where they talk about the default  2    http   msdn microsoft com en-us library system globalization numberformatinfo numberdecimaldigits aspx           Displays a negative value with the default number of decimal digits  2         Int64 myInt   -1234        Console WriteLine  myInt ToString   N   nfi

User · Answer

Checkout the following article on MSDN about examples of the N format  This is also covered in the Standard Numeric Format Strings article  Relevant excerpts           Formatting of 1054 32179              N                      1 054 32              N0                     1 054              N1                     1 054 3              N2                     1 054 32              N3                     1 054 322    When precision specifier controls the number of fractional digits in the result string  the result string reflects a number that is rounded to a representable result nearest to the infinitely precise result  If there are two equally near representable results   On the  NET Framework and  NET Core up to  NET Core 2 0  the runtime selects the result with the greater least significant digit  that is  using MidpointRounding AwayFromZero   On  NET Core 2 1 and later  the runtime selects the result with an even least significant digit  that is  using MidpointRounding ToEven

User · Answer

You can find the list of formats here  in the Double ToString  -MSDN-Article  as comments in the example section

[c#] What is ToString("N0") format?

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