How to Convert Integers to Zero-Padded Strings in C#?

Convert integer to zero padded string in C#

Question:

In C#, you need to convert an integer to a string with leading zeros in front of it. For example, when converting the integer 1 to a string, it should be formatted as 0001.

Solution:

To perform this conversion in C#, there are several ways:

• ToString().PadLeft method:

  <code class="language-csharp">  int i = 1;
    string paddedString = i.ToString().PadLeft(4, '0'); // 输出 "0001"</code>

Please note that this method may not handle negative numbers correctly.

• Explicit formatting:

  <code class="language-csharp">  int i = 1;
    string paddedString = i.ToString("0000"); // 输出 "0001"</code>

This method explicitly defines the required format.

• Abbreviated format specifier:

  <code class="language-csharp">  int i = 1;
    string paddedString = i.ToString("D4"); // 输出 "0001"</code>

The "D" format specifier is shorthand for number formatting, where the specified number represents the minimum number of digits to be displayed.

• String interpolation (C# 6.0):

  <code class="language-csharp">  int i = 1;
    string paddedString = $"{i:0000}"; // 输出 "0001"</code>

String interpolation provides a concise way to format strings, including number formatting using placeholders.

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