In C# I have an integer value which need to be convereted to string but it needs to add zeros before:
For Example:
int i = 1;
When I convert it to string it needs to become 0001
I need to know the syntax in C#.
This question is related to
c#
formatting
number-formatting
.NET has an easy function to do that in the String
class.
Just use:
.ToString().PadLeft(4, '0') // that will fill your number with 0 on the left, up to 4 length
int i = 1;
i.toString().PadLeft(4,'0') // will return "0001"
public static string ToLeadZeros(this int strNum, int num)
{
var str = strNum.ToString();
return str.PadLeft(str.Length + num, '0');
}
// var i = 1;
// string num = i.ToLeadZeros(5);
int p = 3; // fixed length padding
int n = 55; // number to test
string t = n.ToString("D" + p); // magic
Console.WriteLine("Hello, world! >> {0}", t);
// outputs:
// Hello, world! >> 055
i.ToString("0000");
i.ToString("D4");
See MSDN on format specifiers.
Here's a good example:
int number = 1;
//D4 = pad with 0000
string outputValue = String.Format("{0:D4}", number);
Console.WriteLine(outputValue);//Prints 0001
//OR
outputValue = number.ToString().PadLeft(4, '0');
Console.WriteLine(outputValue);//Prints 0001 as well
Easy peasy
int i = 1;
i.ToString("0###")
You can use:
int x = 1;
x.ToString("0000");
Simply
int i=123;
string paddedI = i.ToString("D4");
C# 6.0 style string interpolation
int i = 1;
var str1 = $"{i:D4}";
var str2 = $"{i:0000}";
Here I want to pad my number with 4 digit. For instance, if it is 1 then it should show as 0001, if it 11 it should show as 0011.
Below is the code that accomplishes this:
reciptno=1; // Pass only integer.
string formatted = string.Format("{0:0000}", reciptno);
TxtRecNo.Text = formatted; // Output=0001
I implemented this code to generate money receipt number for a PDF file.
To pad int i
to match the string length of int x
, when both can be negative:
i.ToString().PadLeft((int)Math.Log10(Math.Abs(x < 0 ? x * 10 : x)) + 1, '0')
Source: Stackoverflow.com