CODEWITHSUNDEEP
c#string-formattinginteger
The Sheek Geek
The Sheek Geek

Reputation: 4216

String Formatting for Integers c#

I have a class that contains two strings, one that reflects the current year and one that represents some value. These fields are combined based on a format (uses string.format) that is specified by the user. IMPORTANT: The user entered data used to be generated so it was always an integer and we didn't have to worry about this.

Our default format is "{0}-{1:000}". However, now that the user specified data is a string it does not want to format appropriately. Here is an example:

The user enters 12 as there required data. When formatting, instead of displaying 2011-0012, it is only displaying 2011-12. How can I make sure that the 0's are added without doing some crazy loop that will append the 0's or attempting to parse the number (assuming that it is a number. There should only be enough 0's to equal a string of length 4)?

Here is what I have tried as a format:

"{0}-{1:0000}" -> the original format when the user was forced to enter numbers. "{0}-{1:D4}" "{0}-{1:N4}"

Upvotes: 4

Views: 554

Answers (2)

Polynomial
Polynomial

Reputation: 28316

You can use string.PadLeft to add the zeros to the left, or use int.TryParse to attempt conversion to an integer. The latter will double up as your validation check.

Upvotes: 2

BrokenGlass
BrokenGlass

Reputation: 160852

You could use string.PadLeft():

string output = string.Format("{0}-{1}", "2011", input.PadLeft(4, '0'));

Upvotes: 5

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