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Asked: 2026-05-11T15:23:20+00:00

Duplicate of about 20 recent questions; someone please link them. For simple scenarios when

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Duplicate of about 20 recent questions; someone please link them.

For simple scenarios when should i use one or the other? What are the pros & cons?

What are the recommendations for using extension methods?

EDIT:

Let me give an example. Lets say i have a web relative path represented as a string. Now i want to write a method which 1) Checks if the path begins with ‘/en/ or ‘/fr/’ 2) if it does not then take the value to prepend from another string.

e.g Extension Method

public static string ToLocaleRelativePath(this string s, string contextPath)         { //1. Check if string begins with a locale //2. If it does not prepend the value extracted from the context path }

Is such an operation suited for an exteniosn method or should it be a utility?

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1 Answer

  1. In your example, a utility class is probably more appropriate, because it makes sense only for strings representing relative URLs, rather than for all strings. By contrast, a method that applied to all (or the huge majority of) strings (say, a Trim or Reverse method (if such things didn’t already exist)) would fit nicely as an extension method.

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