In C# I have an integer value which need to be converted to a string, but it needs to add zeros before:
For Example:
int i = 1;
When I convert it to string it needs to become 0001
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1This may help you - How to: Pad a Number with Leading Zeros. Good luckKoonwah– Koonwah2010-12-01 14:23:44 +00:00Commented Dec 1, 2010 at 14:23
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15 Answers
i.ToString().PadLeft(4, '0') - okay, but doesn't work for negative numbers
i.ToString("0000"); - explicit form
i.ToString("D4"); - short form format specifier
$"{i:0000}"; - string interpolation (C# 6.0+)
1 Comment
Kevdog777
@Rahul Read this: msdn.microsoft.com/en-us/library/…
i.ToString("D4");
See MSDN on format specifiers.
1 Comment
Arthur Melo
this way worked for me String.Format("{0:D4}", number);
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
1 Comment
Ewald
Just a hint: You don't need to ToString() the string. PadLeft already returns a string.
C# 6.0 style string interpolation
int i = 1;
var str1 = $"{i:D4}";
var str2 = $"{i:0000}";
1 Comment
Bruno Miquelin
This one looks very nice. Good way to avoid
$"some text {x.ToStrig("D4")} after text"You can use:
int x = 1;
x.ToString("0000");
1 Comment
Yodan Tauber
And a second way to use the same format string:
string.Format("{0:0000}", x)i.ToString("0000");
Comments
Simply
int i=123;
string paddedI = i.ToString("D4");
Comments
.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"
1 Comment
R.Akhlaghi
int i = 1002; string str = i.ToString().PadLeft(4, '0'); // returns "1002" :)
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
Comments
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);
Comments
Most of the given answers are slow or very slow or don't work for negative numbers.
Try this one:
}
//
//
///<summary>Format a value with a fixed number of digits.</summary>
public static string Pad( this long v, int digits ) {
int negative = 0;
if ( v < 0 ) {
negative = 1;
v = Math.Abs( v );
}
var source = v.ToString();
var length = source.Length;
int max = length;
if ( max < digits ) {
max = digits;
}
max += negative;
var ca = new char[ max ];
for ( int i = 0; i < max; i++ ) {
ca[ i ] = '0';
}
while ( length > 0 ) {
ca[ --max ] = source[ --length ];
}
if ( 0 != negative ) ca[ 0 ] = '-';
return new string( ca );
}
Comments
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.
Comments
string hello = "Hello C# Corner.";
string helloHash = hello.PadLeft(5, '#');
Console.WriteLine(helloHash);
Output :-
#####Hello C# Corner.
Comments
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')
1 Comment
Juls
Unnecessarily confusing especially when there is a very simple solution.