How to add extension methods to Enums

Question

I have this Enum code:

enum Duration { Day, Week, Month };

Can I add a extension methods for this Enum?

Answer 1

You can create an extension for anything, even object(although that's not considered best-practice). Understand an extension method just as a public static method. You can use whatever parameter-type you like on methods.

public static class DurationExtensions
{
  public static int CalculateDistanceBetween(this Duration first, Duration last)
  {
    //Do something here
  }
}