How do specify string format C#

Question

I have ID as 10 digits int ex: 1023456789 and I need to set DataGridView format to have there "102-34567 add. 89".

string.Format("###-##### add. ##") doesn't work. So how to do that?

String.Format works. It's job is to to format a non-string value as a string. It doesn't work with string inputs, nor is it meant to. What did you actually try? — Panagiotis Kanavos
– Panagiotis Kanavos, Commented Feb 13, 2023 at 11:02
Assuming it actually is a number, you simply assign the format specifier to the DefaultCellStyle.Format property of the column. You don't call String.Format yourself. The grid calls ToString on the data and passes the format specifier that you provided. — jmcilhinney
– jmcilhinney, Commented Feb 13, 2023 at 11:04

Magnus · Accepted Answer · 2023-02-13 11:02:37Z

4

var result = 1023456789.ToString("###-##### add\\. ##");

answered Feb 13, 2023 at 11:02

Magnus

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2 Comments

This is for a DataGridView though, so there should not be any String.Format or ToString call at all.

You could do it in the CellFormatting event if you wanted to. In any case the format string would be the same.

Hossein Sabziani · Accepted Answer · 2023-02-13 21:16:31Z

0

If the ID length is always 10 characters,you can use String.Insert(Int32, String)

 string s = "1023456789";
 string resultt = s.Insert(3, "_").Insert(9, " add. "); //"102-34567 add. 89"

answered Feb 13, 2023 at 11:02

Hossein Sabziani

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This won't work if the input is actually a 10-digit int. It won't work with a DataGridView at all