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

Leading zero notation for integer strings in C#

In the world of C# programming, converting an integer to a string with leading zeros is a neat trick that can enhance data formatting. Here's how to achieve this:

Syntax and examples:

• i.ToString().PadLeft(4, '0')

This method pads the left side of the string representation of the integer i with zeros, giving it a minimum length of 4.

• i.ToString("0000")

Use this explicit format string to force an integer to be converted to a 4-digit string with leading zeros.

• i.ToString("D4")

The "D" format specifier represents a decimal integer, and "4" specifies the minimum number of digits.

• $"{i:0000}"

String interpolation (C# 6.0) provides a concise way to embed formatted integers into string literals.

Note: Be careful when using PadLeft with negative numbers as it may not produce the expected results. In this case, consider using other methods or explicitly checking for negative values ​​and handling them accordingly.

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