Illustrates using Extensions with Enumeration types

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace EnumsAndExtensions {

	public enum MemberState {
		Empty = 0,
		Joined = 1,
		ToBeVerified = 2,
		Declined = 3,
		Rejected = 4,
		Suspended = 5
	}

	public static class EnumExtensions {
		public static bool Has(this MemberState ms, params MemberState[] possibilities) {
			return possibilities.Contains(ms);
		}
		public static bool NotAMember(this MemberState ms) {
			return ms.Has(MemberState.ToBeVerified, MemberState.Declined, MemberState.Rejected, MemberState.Suspended);
		}
	}

	public class Program {

		static void Main(string[] args) {
			MemberState bobFluqi = MemberState.Rejected;

			// Would you rather write ...
			if (bobFluqi == MemberState.ToBeVerified || bobFluqi == MemberState.Declined || bobFluqi == MemberState.Rejected || bobFluqi == MemberState.Suspended) {
				Console.WriteLine("bobFluqi is not a member.");
			}
			// or ...
			if (bobFluqi.NotAMember())
				Console.WriteLine("bobFluqi is not a member.");
		}

	}

}