Adding comma after each two digits in String.Format

Question

I was trying to format a number 173910234.23 to something like 17,39,10,234.23. Here only the first thousand separator is after three digits. But after that all separators (,) are after two digits. I have tried the following -

double d = 173910234.23;
Console.WriteLine(string.Format("{0:#,##,##,###.00}", d));

but it gives output with comma after every three digits, 173,910,234.23

How can I achieve the format 17,39,10,234.23 using string.Format?

Are you sure? you need 17,39,10,234.23 or 1,73,91,02,34.23 — Sriram Sakthivel
– Sriram Sakthivel, Commented Nov 23, 2013 at 8:43

Sriram Sakthivel · Accepted Answer · 2013-11-23 09:17:24Z

8

Number groups are defined by NumberGroupSizes property of NumberFormatInfo. So modify it accordingly and just use N format specifier.

double d = 173910234.23;
var culture = new CultureInfo("en-us", true)
{
    NumberFormat =
    {
        NumberGroupSizes = new int[] { 3, 2 }
    }
};
Console.WriteLine(d.ToString("N", culture));

This outputs

17,39,10,234.23

Thanks @Rawling and @Hamlet, for shedding light on this. Now OP gets expected output and me too learned something..

edited Nov 23, 2013 at 9:17

answered Nov 23, 2013 at 8:45

Sriram Sakthivel

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6 Comments

Rawling Over a year ago

Hey, I've never hear of NumberGroupSizes before now, but if you make it new int[] { 3, 2 } it should do exactly what OP wants.

Hamlet Hakobyan Over a year ago

After setting NumberGroupSizes you can just use standard number format as d.ToString("N", culture)

Sriram Sakthivel Over a year ago

@HamletHakobyan yup, you're right I just copied from question. Didn't realized whether it is useful or not.

Sriram Sakthivel Over a year ago

Community making this answer more and more good.. Thank you all.. :)

th1rdey3 Over a year ago

I didn't know about NumberGroupSizes. But I knew that there has to be something like this :).

|

Joe · Accepted Answer · 2013-11-23 08:54:33Z

0

string output = null;    
string num = Number.ToString();
for(int i = 0; i < num.Length; ++i)
 {
        switch(i)
        case 2:
        case 4:
        case 6:
            output += ",".ToString() + num[i].ToString(); 
        break;
        default:
            output += num[i].ToString(); 
        break:
 }

If you want to use a different number, replace the numbers with the positions of the numbers where you want to insert the comma before (remember the first character of a string has the position of 0)

answered Nov 23, 2013 at 8:54

Joe

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