C#–Writing Enum extension methods

Sometimes I find myself wanting a quick way to compare an enum with a list of other enums…  Basically, if the enum is one of these, then do this.  It’s pretty easy to do with Linq, but if you want to do it a few times in a few other places, it pays to be DRY and make an extension method.

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	public static class EnumExtensions
	{
	public static bool IsOneOf(this Enum theEnum, params Enum[] enums)
	{
	return enums.Any(e => e.Equals(theEnum));
	}
	}

view raw EnumExtensions.cs hosted with by GitHub

Note that you want to use .Equals and not ==.  You can use == when you know the enum type, but if you’re creating a generic extension method to use with all enums, it won’t work.

	enum MyEnum
	{
	First = 1,
	Second = 2
	}
	public bool AreEqual(Enum first, Enum second)
	{
	return first == second;
	}
	public bool Equals(Enum first, Eunm second)
	{
	return first.Equals(second);
	}
	// ...
	MyEnum myEnum1 = MyEnum.First;
	myEnum1 == MyEnum.First; // True
	AreEqual(myEnum1, MyEnum.First); // False
	Equals(myEnum1, MyEnum.First); // True

view raw EnumExample.cs hosted with by GitHub

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