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What are extension methods in C#?

ICSM Computer 719 19 Jun 2025

Ask by ICSM Computer

Updated 19 Jun 2025

1 Answers

ICSM Computer 19 Jun 2025

What are extension methods in C#?

Extension methods allow adding new methods to existing types without modifying them. They are declared as static methods in static classes, with this in the first parameter.

Example:

public static class StringExtensions
{
    public static bool IsCapitalized(this string str) => !string.IsNullOrEmpty(str) && char.IsUpper(str[0]);
}

Usage:

bool result = "Hello".IsCapitalized(); // true

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