How to Add Leading Zeros to an Integer When Converting to a String in C#?

Convert integer to string with leading zeros in C#

In C#, to convert an integer to a string with leading zeros, you can use several methods:

1. ToString().PadLeft(n, '0'): (not recommended for negative numbers) This method accepts two parameters: the desired string length (n) and the characters used for padding ('0' means zero). It pads the integer on the left with zeros to the specified length.

<code class="language-C#">int i = 1;
var zeroPaddedString = i.ToString().PadLeft(4, '0');
// 输出: "0001"</code>

2. ToString("0000"): Explicit format This format explicitly specifies the desired format as a string with a specific number of zeros.

<code class="language-C#">int i = 1;
var zeroPaddedString = i.ToString("0000");
// 输出: "0001"</code>

3. ToString("D4"): Concise format specifier The "D" format specifier is used for positive integers. It implicitly right-pads the number with zeros to fit the specified length.

<code class="language-C#">int i = 1;
var zeroPaddedString = i.ToString("D4");
// 输出: "0001"</code>

4. String interpolation ($"{i:0000}"): (C# 6.0 only) String interpolation provides a concise string formatting syntax. The expression :"0000" specifies the required format for the integer.

<code class="language-C#">int i = 1;
var zeroPaddedString = $"{i:0000}";
// 输出: "0001"</code>

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